(Address, including zip code, and telephone number, including area code, of registrant’s principal executive offices)

(Name, address, including zip code, and telephone number, including area code, of agent for service)

Approximate date of commencement of proposed sale to the public: From time to time after the effective date of this registration statement as determined by the registrant.

If the only securities being registered on this Form are being offered pursuant to dividend or interest reinvestment plans, please check the following box. ¨

If any of the securities being registered on this Form are to be offered on a delayed or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other than securities offered only in connection with dividend or interest reinvestment plans, check the following box. x

If this Form is filed to register additional securities for an offering pursuant to Rule 462(b) under the Securities Act, please check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a post-effective amendment filed pursuant to Rule 462(c) under the Securities Act, check the following box and list the Securities Act registration statement number of the earlier effective registration statement for the same offering. ¨

If this Form is a registration statement pursuant to General Instruction I.D. or a post-effective amendment thereto that shall become effective upon filing with the Commission pursuant to Rule 462(e) under the Securities Act, check the following box. ¨

If this Form is a post-effective amendment to a registration statement filed pursuant to General Instruction I.D. filed to register additional securities or additional classes of securities pursuant to Rule 413(b) under the Securities Act, check the following box. ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 7(a)(2)(B) of the Securities Act.

THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE SECURITIES ACT OF 1933, AS AMENDED, OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME EFFECTIVE ON SUCH DATE AS THE SECURITIES AND EXCHANGE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a), MAY DETERMINE.

The registrant is filing a single base prospectus in this registration statement pursuant to Rule 429 under the Securities Act, in order to satisfy the requirements of the Securities Act and the rules and regulations thereunder for (i) the offering, issuance and sale by the registrant of up to a maximum aggregate offering price of $55,027,641 of the registrant’s common stock, preferred stock, debt securities, warrants and/or units being registered in this new registration statement (including the Existing Warrant Shares), and (ii) the offering, issuance and sale by the registrant of up to an aggregate offering price of $19,972,359 of the registrant’s unsold common stock, preferred stock, warrants and/or units previously registered under the Prior Registration Statement (but excluding the Existing Warrant Shares), to enable an aggregate of $75,000,000 of securities to be offered pursuant to the combined base prospectus. The combined base prospectus in this registration statement, which is a new registration statement, also constitutes a post-effective amendment to the Prior Registration Statement. Such post-effective amendment shall hereafter become effective concurrently with the effectiveness of this registration statement and in accordance with Section 8(c) of, and Rule 429 under, the Securities Act.

The base prospectus immediately follows this explanatory note. The warrant exercise prospectus supplement immediately follows the base prospectus.

THE INFORMATION IN THIS PROSPECTUS IS NOT COMPLETE AND MAY BE CHANGED. WE MAY NOT SELL THESE SECURITIES UNTIL THE REGISTRATION STATEMENT FILED WITH THE SECURITIES AND EXCHANGE COMMISSION IS EFFECTIVE. THIS PROSPECTUS IS NOT AN OFFER TO SELL THESE SECURITIES AND IS NOT SOLICITING AN OFFER TO BUY THESE SECURITIES IN ANY STATE WHERE THE OFFER OR SALE IS NOT PERMITTED.

Ekso Bionics Holdings, Inc., a Nevada corporation (“Ekso Bionics”), may offer and sell from time to time, pursuant to this prospectus, in one or more series or issuances and on terms that Ekso Bionics will determine at the time of the offering, any of the securities described in this prospectus, and any combination of those securities, up to an aggregate amount of $75,000,000.

This prospectus describes the general terms of these securities and the general manner in which these securities will be offered. We will provide you with the specific terms of any offering in one or more supplements to this prospectus. The prospectus supplements will also describe the specific manner in which these securities will be offered and may also supplement, update or amend information contained in this document. You should read this prospectus and any prospectus supplement, as well as any documents incorporated by reference into this prospectus or any prospectus supplement, carefully before you invest.

We may offer and sell these securities directly to you, through agents designated from time to time, or to or through underwriters or dealers. For additional information on the methods of sale, you should refer to the section entitled “Plan of Distribution” in this prospectus and in the applicable prospectus supplement. If any underwriters or agents are involved in the sale of our securities with respect to which this prospectus is being delivered, the names of such underwriters or agents and any applicable fees, commissions or discounts and over-allotment options will be set forth in the applicable prospectus supplement. The price to the public of such securities and the net proceeds that we expect to receive from such sale will also be set forth in a prospectus supplement.

Our common stock is listed on the Nasdaq Capital Market under the symbol “EKSO.” On June 15, 2020, the last reported sale price of our common stock was $3.78 per share. The applicable prospectus supplement will contain information, where applicable, as to any other listing, if any, on the Nasdaq Capital Market or any securities market or other securities exchange of the securities covered by the prospectus supplement. Prospective purchasers of our securities are urged to obtain current information as to the market prices of our securities, where applicable.

As of June 15, 2020, the aggregate market value of our outstanding common stock held by non-affiliates, or the public float, was approximately $33,839,811 million based on 7,591,146 shares of outstanding stock, of which 6,532,782 are held by non-affiliates, and a per share price of $5.18, which was the closing sale price of our common stock on June 5, 2020. Pursuant to General Instruction I.B.6 of Form S-3, in no event will we sell our common stock in a public primary offering with a value exceeding more than one-third of our public float in any 12-month period so long as our public float remains below $75,000,000. We have sold an aggregate of $7,890,010 of securities pursuant to General Instruction I.B.6 of Form S-3 during the prior 12 calendar month period that ends on and includes the date of this prospectus.

Investing in our securities involves a high degree of risk. Before deciding whether to invest in our securities, you should consider carefully the risks that we have described on page 4 of this prospectus under the caption “Risk Factors.” We may include specific risk factors in supplements to this prospectus under the caption “Risk Factors.” This prospectus may not be used to sell our securities unless accompanied by a prospectus supplement.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

This prospectus is part of a registration statement on Form S-3 that we filed with the Securities and Exchange Commission (the “SEC”) using a “shelf” registration process. Under this shelf registration process, we may offer and sell, from time to time, shares of our common stock and preferred stock, various series of warrants or rights to purchase any of such securities, either individually or in units, in one or more offerings, with a total value of up to $75,000,000. This prospectus provides you with a general description of the securities we may offer. Each time we offer a type or series of securities under this prospectus, we will provide a prospectus supplement that will contain specific information about the terms of that offering.

This prospectus does not contain all of the information included in the registration statement. For a more complete understanding of the offering of the securities, you should refer to the registration statement, including its exhibits. The prospectus supplement may also add, update or change information contained or incorporated by reference in this prospectus. However, no prospectus supplement will offer a security that is not registered and described in this prospectus at the time of its effectiveness. This prospectus, together with the applicable prospectus supplements and the documents incorporated by reference into this prospectus, includes all material information relating to the offering of securities under this prospectus. You should carefully read this prospectus, the applicable prospectus supplement, the information and documents incorporated herein by reference and the additional information under the heading “Where You Can Find More Information” before making an investment decision.

You should rely only on the information we have provided or incorporated by reference in this prospectus or any prospectus supplement. We have not authorized anyone to provide you with information different from that contained or incorporated by reference in this prospectus. No dealer, salesperson or other person is authorized to give any information or to represent anything not contained or incorporated by reference in this prospectus. You must not rely on any unauthorized information or representation. This prospectus is an offer to sell only the securities offered hereby, but only under circumstances and in jurisdictions where it is lawful to do so. You should assume that the information in this prospectus or any prospectus supplement is accurate only as of the date on the front of the document and that any information we have incorporated herein by reference is accurate only as of the date of the document incorporated by reference, regardless of the time of delivery of this prospectus or any sale of a security.

We further note that the representations, warranties and covenants made by us in any agreement that is filed as an exhibit to any document that is incorporated by reference in the accompanying prospectus were made solely for the benefit of the parties to such agreement, including, in some cases, for the purpose of allocating risk among the parties to such agreements, and should not be deemed to be a representation, warranty or covenant to you. Moreover, such representations, warranties or covenants were accurate only as of the date when made. Accordingly, such representations, warranties and covenants should not be relied on as accurately representing the current state of our affairs.

This prospectus may not be used to consummate sales of our securities, unless it is accompanied by a prospectus supplement. To the extent there are inconsistencies between any prospectus supplement, this prospectus and any documents incorporated by reference, the document with the most recent date will control.

Unless the context otherwise requires, “Ekso Bionics,” “the Company,” “we,” “us,” “our” and similar terms refer to Ekso Bionics Holdings, Inc. and our subsidiaries.

PROSPECTUS SUMMARY

The following is a summary of what we believe to be the most important aspects of our business and the offering of our securities under this prospectus. We urge you to read this entire prospectus, including the more detailed consolidated financial statements, notes to the consolidated financial statements and other information incorporated by reference from our other filings with the SEC or included in any applicable prospectus supplement. Investing in our securities involves risks. Therefore, you should carefully consider the risk factors set forth in any prospectus supplements and in our most recent annual and quarterly filings with the SEC, as well as other information in this prospectus and any prospectus supplements and the documents incorporated by reference herein or therein, before purchasing our securities. Each of the risk factors could adversely affect our business, operating results and financial condition, as well as adversely affect the value of an investment in our securities.

Overview

Ekso Bionics designs, develops and sells exoskeletons that augment human strength, endurance, and mobility. Our exoskeleton technology serves multiple markets and can be used both by able-bodied persons as well as by persons with physical disabilities. We have sold, rented or leased devices that (a) enable individuals with neurological conditions affecting gait (stroke and spinal cord injury) to rehabilitate, and in some cases, to walk again, (ii) assist individuals with a broad range of upper extremity impairments, and (iii) allow industrial workers to perform difficult repetitive work for extended periods.

We believe that the commercial opportunity for exoskeleton technology adoption is accelerating as a result of recent advancements in material technologies, electronic and electrical engineering, control technologies, and sensor and software development. Taken individually, many of these advancements have become ubiquitous in peoples’ everyday lives. We believe that we have learned how to integrate these existing technologies and wrap the result around a human being efficiently, elegantly and safely, supported by an industry leading intellectual property portfolio. We further believe that we can do so across a broad spectrum of applications, from persons with lower limb paralysis to able-bodied users.

Additional Information

For additional information related to our business and operations, please refer to the reports incorporated herein by reference, including our Annual Report on Form 10-K for the year ended December 31, 2019 and our most recent Quarterly Report on Form 10-Q, as described under the caption “Incorporation of Documents by Reference” on page 32 of this prospectus.

Corporate Information

We were incorporated as PN Med Group Inc. in Nevada on January 30, 2012 and changed our name to Ekso Bionics Holdings, Inc. in December 2013. In January 2014, we consummated a merger, in which our wholly-owned subsidiary, Ekso Acquisition Corp. merged with and into Ekso Bionics, Inc., which was the surviving corporation and became our wholly-owned subsidiary.

On March 24, 2020, we effected a 1-for-15 reverse split of our common stock. As a result of the reverse stock split, every 15 shares of issued and outstanding common stock were converted into one share of issued and outstanding common stock. We previously effected a 1-for-7 reverse stock split on May 4, 2016. Unless otherwise indicated, all references to share and per share amounts in this prospectus, including any prospectus supplement, reflect the reverse stock splits.

Our principal executive office is located at 1414 Harbour Way South, Suite 1201, Richmond, California, and our telephone number is (510) 984-1761.

We make available free of charge on or through our website our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K, and all amendments to those reports as soon as reasonably practicable after they are electronically filed with, or furnished to, the SEC. Our internet address is www.eksobionics.com. This website address is intended to be an inactive, textual reference only; none of the material on this website is part of this prospectus. Copies of our annual reports on Form 10-K will be furnished without charge to any person who submits a written request directed to the attention of our Secretary, at our offices located at 1414 Harbour Way South, Suite 1201, Richmond, California, 94804. The SEC maintains an internet site (http://www.sec.gov) that contains reports, proxy and information statements, and other information regarding issuers that file electronically with the SEC.

Offerings Under This Prospectus

Under this prospectus, we may offer shares of our common stock, preferred stock and debt securities, various series of warrants or rights to purchase any of such securities, either individually or in units, with a total value of up to $75,000,000, from time to time at prices and on terms to be determined by market conditions at the time of the offering. This prospectus provides you with a general description of the securities we may offer. Each time we offer a type or series of securities under this prospectus, we will provide a prospectus supplement that will describe the specific amounts, prices and other important terms of the securities.

The prospectus supplement also may add, update or change information contained in this prospectus or in documents we have incorporated by reference into this prospectus. However, no prospectus supplement will fundamentally change the terms that are set forth in this prospectus or offer a security that is not registered and described in this prospectus at the time of its effectiveness.

We may sell the securities directly to investors or to or through agents, underwriters or dealers. We, and our agents, underwriters or dealers, reserve the right to accept or reject all or part of any proposed purchase of securities. If we offer securities through agents, underwriters or dealers, we will include in the applicable prospectus supplement:

•

the names of those agents, underwriters or dealers;

•

applicable fees, discounts and commissions to be paid to them;

•

details regarding over-allotment options, if any; and

•

the net proceeds to us.

This prospectus may not be used to consummate a sale of any securities unless it is accompanied by a prospectus supplement.

Investing in our securities involves significant risk. The prospectus supplement applicable to each offering of our securities will contain a discussion of the risks applicable to an investment in Ekso Bionics. Prior to making a decision about investing in our securities, you should carefully consider the specific factors discussed under the heading “Risk Factors” in the applicable prospectus supplement, together with all of the other information contained or incorporated by reference in the prospectus supplement or appearing or incorporated by reference in this prospectus. You should also consider the risks, uncertainties and assumptions discussed under the heading “Risk Factors” included in our most recent annual report on Form 10-K, as revised or supplemented by our subsequent quarterly reports on Form 10-Q or our current reports on Form 8-K on file with the SEC, all of which are incorporated herein by reference, and which may be amended, supplemented or superseded from time to time by other reports we file with the SEC in the future. The risks and uncertainties we have described are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our operations. The occurrence of any of these risks might cause you to lose all or part of your investment in the offered securities.

The SEC encourages companies to disclose forward-looking information so that investors can better understand a company’s future prospects and make informed investment decisions. This prospectus and the documents we have filed with the SEC that are incorporated herein by reference contain such “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995.

Such statements in connection with any discussion of future operations or financial performance are identified by the use of words such as “may,” “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” and other words and terms of similar meaning. Forward-looking statements include, but are not limited to, statements regarding: (i) the plans and objectives of management for future operations, including plans or objectives relating to the design, development and commercialization of human exoskeletons, (ii) a projection of income (including income/loss), earnings (including earnings/loss) per share, capital expenditures, dividends, capital structure or other financial items, (iii) our future financial performance, including any such statement contained in a discussion and analysis of financial condition by management or in the results of operations included pursuant to the rules and regulations of the Securities and Exchange Commission (the “SEC”), (iv) our beliefs regarding the potential for commercial opportunity for exoskeleton technology in general and our exoskeleton products in particular, (v) our beliefs regarding potential clinical and other health benefits of our medical devices, and (vi) the assumptions underlying or relating to any statement described in points (i), (ii), (iii), (iv) or (v) above.

We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Actual results or events could differ materially from the plans, intentions and expectations disclosed in the forward-looking statements we make. We have included important cautionary statements in this Registration Statement, particularly in the “Risk Factors” section, that we believe could cause actual results or events to differ materially from the forward-looking statements that we make. For a summary of such factors, please refer to the section entitled “Risk Factors” in this prospectus, as updated and supplemented by the discussion of risks and uncertainties under “Risk Factors” contained in any supplements to this prospectus and in our most recent annual report on Form 10-K, as revised or supplemented by our subsequent quarterly reports on Form 10-Q or our current reports on Form 8-K, as well as any amendments thereto, as filed with the SEC and which are incorporated herein by reference. The information contained in this document is believed to be current as of the date of this document. We do not intend to update any of the forward-looking statements after the date of this document to conform these statements to actual results or to changes in our expectations, except as required by law.

In light of these assumptions, risks and uncertainties, the results and events discussed in the forward-looking statements contained in this prospectus or in any document incorporated herein by reference might not occur. Investors are cautioned not to place undue reliance on the forward-looking statements, which speak only as of the date of this prospectus or the date of the document incorporated by reference in this prospectus. We are not under any obligation, and we expressly disclaim any obligation, to update or alter any forward-looking statements, whether as a result of new information, future events or otherwise. All subsequent forward-looking statements attributable to us or to any person acting on our behalf are expressly qualified in their entirety by the cautionary statements contained or referred to in this section.

We cannot assure you that we will receive any proceeds in connection with securities which may be offered pursuant to this prospectus. Unless otherwise indicated in the applicable prospectus supplement, we intend to use any net proceeds from the sale of securities under this prospectus for our operations and to increase our investments (i) in our clinical, sales and marketing initiatives to accelerate adoption of our products in the rehabilitation market, (ii) in our research, development and commercialization activities with respect to our robotic exoskeleton for home use, and/or (iii) in the development and commercialization of able-bodied exoskeletons for industrial use, and for other general corporate purposes, including, but not limited to, working capital, intellectual property protection and enforcement, capital expenditures, investments, acquisitions and collaborations. We have not determined the amounts we plan to spend on any of the areas listed above or the timing of these expenditures. As a result, our management will have broad discretion to allocate the net proceeds, if any, we receive in connection with securities offered pursuant to this prospectus for any purpose. Pending application of the net proceeds as described above, we may initially invest the net proceeds in short-term, investment-grade, or interest-bearing securities.

We may offer securities under this prospectus from time to time pursuant to underwritten public offerings, negotiated transactions, “at the market” sales, block trades or a combination of these methods. We may sell the securities:

The distribution of securities may be effected, from time to time, in one or more transactions, including:

We may distribute the securities from time to time in one or more transactions at:

We may directly solicit offers to purchase the securities being offered by this prospectus. We may also designate agents to solicit offers to purchase the securities from time to time. The prospectus supplement relating to a series of the offered securities will name any underwriters, dealers or agents involved in the offer or sale of the securities.

If we utilize a dealer in the sale of the securities being offered by this prospectus, we will sell the securities to the dealer, as principal. The dealer may then resell the securities to the public at varying prices to be determined by the dealer at the time of resale.

If we utilize an underwriter in the sale of the securities being offered by this prospectus, we will execute an underwriting agreement with the underwriter at the time of sale, and we will provide the name of any underwriter in the prospectus supplement, which the underwriter will use to make resales of the securities to the public. In connection with the sale of the securities, we, or the purchasers of the securities for whom the underwriter may act as agent, may compensate the underwriter in the form of underwriting discounts or commissions. The underwriter may sell the securities to or through dealers, and the underwriter may compensate those dealers in the form of discounts, concessions or commissions.

With respect to underwritten public offerings, negotiated transactions and block trades, we will provide in the applicable prospectus supplement information regarding any compensation we pay to underwriters, dealers or agents in connection with the offering of the securities, and any discounts, concessions or commissions allowed by underwriters to participating dealers. Underwriters, dealers and agents participating in the distribution of the securities may be deemed to be underwriters within the meaning of the Securities Act, and any discounts and commissions received by them and any profit realized by them on resale of the securities may be deemed to be underwriting discounts and commissions. We may enter into agreements to indemnify underwriters, dealers and agents against civil liabilities, including liabilities under the Securities Act, or to contribute to payments they may be required to make in respect thereof.

If so indicated in the applicable prospectus supplement, we will authorize underwriters, dealers or other persons acting as our agents to solicit offers by certain institutions to purchase securities from us pursuant to delayed delivery contracts providing for payment and delivery on the date stated in each applicable prospectus supplement. Each contract will be for an amount not less than, and the aggregate amount of securities sold pursuant to such contracts shall not be less nor more than, the respective amounts stated in each applicable prospectus supplement. Institutions with whom the contracts, when authorized, may be made include commercial and savings banks, insurance companies, pension funds, investment companies, educational and charitable institutions and other institutions, but shall in all cases be subject to our approval. Delayed delivery contracts will not be subject to any conditions except that:

One or more firms, referred to as “remarketing firms,” may also offer or sell the securities, if a prospectus supplement so indicates, in connection with a remarketing arrangement upon their purchase. Remarketing firms will act as principals for their own accounts or as our agents. These remarketing firms will offer or sell the securities in accordance with the terms of the securities. Each prospectus supplement will identify and describe any remarketing firm and the terms of its agreement, if any, with us and will describe the remarketing firm’s compensation. Remarketing firms may be deemed to be underwriters in connection with the securities they remarket. Remarketing firms may be entitled under agreements that may be entered into with us to indemnification by us against certain civil liabilities, including liabilities under the Securities Act, and may be customers of, engage in transactions with or perform services for us in the ordinary course of business.

Certain underwriters may use this prospectus and any accompanying prospectus supplement for offers and sales related to market-making transactions in the securities. These underwriters may act as principal or agent in these transactions, and the sales will be made at prices related to prevailing market prices at the time of sale. Any underwriters involved in the sale of the securities may qualify as “underwriters” within the meaning of Section 2(a)(11) of the Securities Act. In addition, the underwriters’ commissions, discounts or concessions may qualify as underwriters’ compensation under the Securities Act and the rules of the Financial Industry Regulatory Authority, Inc. (“FINRA”).

Shares of our common stock sold pursuant to the registration statement of which this prospectus is a part will be listed on the Nasdaq Capital Market. The applicable prospectus supplement will contain information, where applicable, as to any other listing, if any, on the Nasdaq Capital Market or any securities market or other securities exchange of the securities covered by the prospectus supplement. Underwriters may make a market in our common stock, but will not be obligated to do so and may discontinue any market making at any time without notice. We can make no assurance as to the liquidity of or the existence, development or maintenance of trading markets for any of the securities.

In order to facilitate the offering of the securities, certain persons participating in the offering may engage in transactions that stabilize, maintain or otherwise affect the price of the securities. This may include over-allotments or short sales of the securities, which involve the sale by persons participating in the offering of more securities than we sold to them. In these circumstances, these persons would cover such over-allotments or short positions by making purchases in the open market or by exercising their over-allotment option. In addition, these persons may stabilize or maintain the price of the securities by bidding for or purchasing the applicable security in the open market or by imposing penalty bids, whereby selling concessions allowed to dealers participating in the offering may be reclaimed if the securities sold by them are repurchased in connection with stabilization transactions. The effect of these transactions may be to stabilize or maintain the market price of the securities at a level above that which might otherwise prevail in the open market. These transactions may be discontinued at any time.

The underwriters, dealers and agents may engage in other transactions with us, or perform other services for us, in the ordinary course of their business.

We are authorized to issue 141,428,571 shares of common stock, par value $0.001 per share. On June 15, 2020, we had 7,591,146 shares of common stock outstanding and approximately 202 stockholders of record.

The following summary of certain provisions of our common stock does not purport to be complete. You should refer to our articles of incorporation and our bylaws, both of which are included as exhibits to the registration statement of which this prospectus is a part. The summary below is also qualified by provisions of applicable law.

Dividends. The holders of outstanding shares of common stock are entitled to receive dividends out of assets or funds legally available for the payment of dividends of such times and in such amounts as the board from time to time may determine.

Voting. Holders of common stock are entitled to one vote for each share held on all matters submitted to a vote of stockholders. There is no cumulative voting of the election of directors then standing for election.

Pre-emptive Rights, Redemption, Conversion and Sinking Fund Provisions. The common stock is not entitled to pre-emptive rights and is not subject to conversion, redemption or sinking fund provisions.

Liquidation Rights. Upon liquidation, dissolution or winding up of our Company, the assets legally available for distribution to stockholders are distributable ratably among the holders of the common stock after payment of liquidation preferences, if any, on any outstanding payment of other claims of creditors. Each outstanding share of common stock is duly and validly issued, fully paid and non-assessable.

Transfers. There are no restrictions on the transfer of our common stock except such restrictions as may be imposed by applicable securities laws.

The transfer agent and registrar for our common stock is VStock Transfer, LLC. The transfer agent’s address is 18 Lafayette Place, Woodmere, New York 11598 and its telephone number is (212) 828-8436.

Our common stock is listed on the Nasdaq Capital Market under the symbol “EKSO.”

We are authorized to issue 10,000,000 shares of preferred stock, par value $0.001 per share. As of June 15, 2020, no shares of our preferred stock were outstanding. The following summary of certain provisions of our preferred stock does not purport to be complete. You should refer to our articles of incorporation and our bylaws, both of which are included as exhibits to the registration statement of which this prospectus is a part. The summary below is also qualified by provisions of applicable law.

Our board of directors may, without further action by our stockholders, from time to time, direct the issuance of shares of preferred stock in one or more series and may, at the time of issuance, determine the rights, preferences and limitations of each series, including voting rights, dividend rights and redemption and liquidation preferences. Satisfaction of any dividend preferences of outstanding shares of preferred stock would reduce the amount of funds available for the payment of dividends on shares of our common stock. Holders of shares of preferred stock may be entitled to receive a preference payment in the event of any liquidation, dissolution or winding-up of our company before any payment is made to the holders of shares of our common stock. In some circumstances, the issuance of shares of preferred stock may render more difficult or tend to discourage a merger, tender offer or proxy contest, the assumption of control by a holder of a large block of our securities or the removal of incumbent management. Upon the affirmative vote of our board of directors, without stockholder approval, we may issue shares of preferred stock with voting and conversion rights which could adversely affect the holders of shares of our common stock.

If we offer a specific series of preferred stock under this prospectus, we will describe the terms of the preferred stock in the prospectus supplement for such offering and will file a copy of the certificate establishing the terms of the preferred stock with the SEC. To the extent required, this description will include:

The transfer agent and registrar for our preferred stock will be set forth in the applicable prospectus supplement.

As of June 12, 2020, warrants to purchase an aggregate of 2,168,463 shares of our common stock are issued and outstanding, of which warrants to purchase 106,896 shares of common stock have an exercise price of $41.25 per share and expire on December 23, 2020, warrants to purchase 13,333 shares of common stock have an exercise price of $22.50 per share and expire on September 13, 2020, warrants to purchase 444,444 shares of common stock have an exercise price of $3.52 per share and expire on May 24, 2024, warrants to purchase 51,836 shares have an exercise price of $8.44 and expire on December 18, 2025, warrants to purchase 555,763 shares have an exercise price of $8.10 and expire on June 21, 2025, warrants to purchase 873,852 shares of common stock have an exercise price of $5.18 and expire on December 10, 2025, and warrants to purchase 122,339 shares of common stock have an exercise price of $5.6431 per share.

We may issue warrants to purchase shares of our common stock and/or preferred stock in one or more series together with other securities or separately. Below is a description of certain general terms and provisions of the warrants that we may offer. Particular terms of the warrants will be described in the warrant agreements and the prospectus supplement relating to the warrants.

The applicable prospectus supplement will contain, where applicable, the following terms of and other information relating to the warrants:

The transfer agent and registrar for any warrants will be set forth in the applicable prospectus supplement.

The debt securities may be either secured or unsecured and will either be our senior debt securities or our subordinated debt securities. The debt securities will be issued under one or more separate indentures between us and a trustee to be specified in an accompanying prospectus supplement. Senior debt securities will be issued under a senior indenture and subordinated debt securities will be issued under a subordinated indenture. Together, the senior indenture and the subordinated indenture are called indentures in this description. This prospectus, together with the applicable prospectus supplement, will describe the terms of a particular series of debt securities.

The following is a summary of selected provisions and definitions of the indentures and debt securities to which any prospectus supplement may relate. The summary of selected provisions of the indentures and the debt securities appearing below is not complete and is subject to, and qualified entirely by reference to, all of the provisions of the applicable indenture and certificates evidencing the applicable debt securities. For additional information, you should look at the applicable indenture and the certificate evidencing the applicable debt security that is filed as an exhibit to the registration statement that includes this prospectus, as it may be supplemented, amended or modified from time to time, as well as the notes and supplemental agreements relating to each series of debt securities that will be incorporated by reference as exhibits to the registration statement that includes this prospectus or as exhibits to a current report on Form 8-K if we offer debt securities. In this description of the debt securities, the words “Ekso Bionics,” “the Company,” “we,” “us,” “our” and similar terms refer to Ekso Bionics Holdings, Inc. and our subsidiaries unless the context otherwise requires.

The following description sets forth selected general terms and provisions of the applicable indenture and debt securities to which any prospectus supplement may relate. Other specific terms of the applicable indenture and debt securities will be described in the applicable prospectus supplement. If any particular terms of the indenture or debt securities described in a prospectus supplement differ from any of the terms described below, then the terms described below will be deemed to have been superseded by that prospectus supplement.

Debt securities may be issued in separate series without limitation as to aggregate principal amount. We may specify a maximum aggregate principal amount for the debt securities of any series.

We are not limited as to the amount of debt securities we may issue under the indentures. Unless otherwise provided in a prospectus supplement, a series of debt securities may be reopened to issue additional debt securities of such series.

The prospectus supplement relating to a particular series of debt securities will set forth:

Unless otherwise specified in the prospectus supplement, the debt securities will be registered debt securities. Debt securities may be sold at a substantial discount below their stated principal amount, bearing no interest or interest at a rate which, at the time of issuance, is below market rates. The U.S. federal income tax considerations applicable to debt securities sold at a discount will be described in the applicable prospectus supplement.

Debt securities may be transferred or exchanged at the office of the security registrar or at the office of any transfer agent designated by us.

We will not impose a service charge for any transfer or exchange, but we may require holders to pay any tax or other governmental charges associated with any transfer or exchange.

In the event of any partial redemption of debt securities of any series, we will not be required to:

We will appoint the trustee as the initial security registrar. Any transfer agent, in addition to the security registrar initially designated by us, will be named in the prospectus supplement. We may designate additional transfer agents or change transfer agents or change the office of the transfer agent. However, we will be required to maintain a transfer agent in each place of payment for the debt securities of each series.

The debt securities of any series may be represented, in whole or in part, by one or more global securities. Each global security will:

No global security may be exchanged in whole or in part for debt securities registered in the name of any person other than the depositary or any nominee unless:

As long as the depositary, or its nominee, is the registered owner of a global security, the depositary or nominee will be considered the sole owner and holder of the debt securities represented by the global security for all purposes under the indentures. Except in the above limited circumstances, owners of beneficial interests in a global security will not be:

Payments on a global security will be made to the depositary or its nominee as the holder of the global security. Some jurisdictions have laws that require that certain purchasers of securities take physical delivery of such securities in definitive form. These laws may impair the ability to transfer beneficial interests in a global security.

Institutions that have accounts with the depositary or its nominee are referred to as “participants.” Ownership of beneficial interests in a global security will be limited to participants and to persons that may hold beneficial interests through participants. The depositary will credit, on its book-entry registration and transfer system, the respective principal amounts of debt securities represented by the global security to the accounts of its participants.

Ownership of beneficial interests in a global security will be shown on and effected through records maintained by the depositary, with respect to participants’ interests, or any participant, with respect to interests of persons held by participants on their behalf.

Payments, transfers and exchanges relating to beneficial interests in a global security will be subject to policies and procedures of the depositary. The depositary policies and procedures may change from time to time. Neither any trustee nor we will have any responsibility or liability for the depositary’s or any participant’s records with respect to beneficial interests in a global security.

Unless otherwise indicated in a prospectus supplement, the provisions described in this paragraph will apply to the debt securities. Payment of interest on a debt security on any interest payment date will be made to the person in whose name the debt security is registered at the close of business on the regular record date. Payment on debt securities of a particular series will be payable at the office of a paying agent or paying agents designated by us. However, at our option, we may pay interest by mailing a check to the record holder. The trustee will be designated as our initial paying agent.

We may also name any other paying agents in a prospectus supplement. We may designate additional paying agents, change paying agents or change the office of any paying agent. However, we will be required to maintain a paying agent in each place of payment for the debt securities of a particular series.

All moneys paid by us to a paying agent for payment on any debt security that remain unclaimed for a period ending the earlier of:

will be repaid to us thereafter. The holder may look only to us for such payment.

Unless otherwise indicated in a prospectus supplement with respect to a particular series of debt securities, the debt securities will not contain any provisions that may afford holders of the debt securities protection in the event we have a change in control or in the event of a highly leveraged transaction, whether or not such transaction results in a change in control.

Unless otherwise indicated in a prospectus supplement with respect to a particular series of debt securities, the debt securities will not contain any financial or restrictive covenants.

Unless we indicate otherwise in a prospectus supplement with respect to a particular series of debt securities, we may not consolidate with or merge into any other person (other than a subsidiary of us), in a transaction in which we are not the surviving corporation, or convey, transfer or lease our properties and assets substantially as an entirety to, any person (other than a subsidiary of us), unless:

Unless we indicate otherwise in a prospectus supplement, the following will be events of default for any series of debt securities under the indentures:

Additional or different events of default applicable to a series of debt securities may be described in a prospectus supplement. An event of default of one series of debt securities is not necessarily an event of default for any other series of debt securities.

The trustee may withhold notice to the holders of any default, except defaults in the payment of principal, premium, if any, interest, any sinking fund installment on, or with respect to any conversion right of, the debt securities of such series. However, the trustee must consider it to be in the interest of the holders of the debt securities of such series to withhold this notice.

Unless we indicate otherwise in a prospectus supplement, if an event of default, other than an event of default described in clause (5) above, shall occur and be continuing with respect to any series of debt securities, either the trustee or the holders of at least a 25 percent in aggregate principal amount of the outstanding securities of that series may declare the principal amount and premium, if any, of the debt securities of that series, or if any debt securities of that series are original issue discount securities, such other amount as may be specified in the applicable prospectus supplement, in each case together with accrued and unpaid interest, if any, thereon, to be due and payable immediately.

Unless we indicate otherwise in a prospectus supplement, if an event of default described in clause (5) above shall occur, the principal amount and premium, if any, of all the debt securities of that series, or if any debt securities of that series are original issue discount securities, such other amount as may be specified in the applicable prospectus supplement, in each case together with accrued and unpaid interest, if any, thereon, will automatically become immediately due and payable. Any payment by us on the subordinated debt securities following any such acceleration will be subject to the subordination provisions described below under “Subordinated debt securities.”

Notwithstanding the foregoing, each indenture will provide that we may, at our option, elect that the sole remedy for an event of default relating to our failure to comply with our obligations described under the section entitled “Reports” below or our failure to comply with the requirements of Section 314(a)(1) of the Trust Indenture Act will for the first 180 days after the occurrence of such an event of default consist exclusively of the right to receive additional interest on the relevant series of debt securities at an annual rate equal to (i) 0.25% of the principal amount of such series of debt securities for the first 90 days after the occurrence of such event of default and (ii) 0.50% of the principal amount of such series of debt securities from the 91st day to, and including, the 180th day after the occurrence of such event of default, which we call “additional interest.” If we so elect, the additional interest will accrue on all outstanding debt securities from and including the date on which such event of default first occurs until such violation is cured or waived and shall be payable on each relevant interest payment date to holders of record on the regular record date immediately preceding the interest payment date. On the 181st day after such event of default (if such violation is not cured or waived prior to such 181st day), the debt securities will be subject to acceleration as provided above. In the event we do not elect to pay additional interest upon any such event of default in accordance with this paragraph, the debt securities will be subject to acceleration as provided above.

In order to elect to pay the additional interest as the sole remedy during the first 180 days after the occurrence of any event of default relating to the failure to comply with the reporting obligations in accordance with the preceding paragraph, we must notify all holders of debt securities and the trustee and paying agent of such election prior to the close of business on the first business day following the date on which such event of default occurs. Upon our failure to timely give such notice or pay the additional interest, the debt securities will be immediately subject to acceleration as provided above.

After acceleration, the holders of a majority in aggregate principal amount of the outstanding securities of that series may, under certain circumstances, rescind and annul such acceleration if all events of default, other than the non-payment of accelerated principal, or other specified amounts or interest, have been cured or waived.

Other than the duty to act with the required care during an event of default, the trustee will not be obligated to exercise any of its rights or powers at the request of the holders unless the holders shall have offered to the trustee reasonable indemnity. Generally, the holders of a majority in aggregate principal amount of the outstanding debt securities of any series will have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee or exercising any trust or power conferred on the trustee.

A holder of debt securities of any series will not have any right to institute any proceeding under the indentures, or for the appointment of a receiver or a trustee, or for any other remedy under the indentures, unless:

Holders may, however, sue to enforce the payment of principal, premium or interest on any debt security on or after the due date or to enforce the right, if any, to convert any debt security (if the debt security is convertible) without following the procedures listed in (1) through (3) above.

We will furnish the trustee an annual statement from our officers as to whether or not we are in default in the performance of the conditions and covenants under the indenture and, if so, specifying all known defaults.

Unless we indicate otherwise in a prospectus supplement, the applicable trustee and we may make modifications and amendments to an indenture with the consent of the holders of a majority in aggregate principal amount of the outstanding securities of each series affected by the modification or amendment.

We may also make modifications and amendments to the indentures for the benefit of holders without their consent, for certain purposes including, but not limited to:

However, neither the trustee nor we may make any modification or amendment without the consent of the holder of each outstanding security of that series affected by the modification or amendment if such modification or amendment would:

We may be discharged from our obligations on the debt securities, subject to limited exceptions, of any series that have matured or will mature or be redeemed within one year if we deposit enough money with the trustee to pay all the principal, interest and any premium due to the stated maturity date or redemption date of the debt securities.

Each indenture contains a provision that permits us to elect either or both of the following:

To make either of the above elections, we must irrevocably deposit in trust with the trustee enough money to pay in full the principal, interest and premium on the debt securities. This amount may be made in cash and/or U.S. government obligations or, in the case of debt securities denominated in a currency other than U.S. dollars, cash in the currency in which such series of securities is denominated and/or foreign government obligations. As a condition to either of the above elections, for debt securities denominated in U.S. dollars we must deliver to the trustee an opinion of counsel that the holders of the debt securities will not recognize income, gain or loss for U.S. federal income tax purposes as a result of the action.

With respect to debt securities of any series that are denominated in a currency other than United States dollars, “foreign government obligations” means:

The indentures provide that any reports or documents that we file with the SEC pursuant to Section 13 or 15(d) of the Exchange Act will be filed with the trustee within 15 days after the same is filed with the SEC. Documents filed by us with the SEC via the EDGAR system will be deemed filed with the trustee as of the time such documents are filed with the SEC.

Notices to holders will be given by mail to the addresses of the holders in the security register.

The indentures and the debt securities will be governed by, and construed under, the laws of the State of New York.

No incorporator, stockholder, employee, agent, officer, director or subsidiary of ours will have any liability for any obligations of ours, or because of the creation of any indebtedness under the debt securities, the indentures or supplemental indentures. The indentures provide that all such liability is expressly waived and released as a condition of, and as a consideration for, the execution of such indentures and the issuance of the debt securities.

The indentures limit the right of the trustee, should it become our creditor, to obtain payment of claims or secure its claims.

The trustee will be permitted to engage in certain other transactions with us. However, if the trustee acquires any conflicting interest, and there is a default under the debt securities of any series for which it is trustee, the trustee must eliminate the conflict or resign.

The following provisions will be applicable with respect to each series of subordinated debt securities, unless otherwise stated in the prospectus supplement relating to that series of subordinated debt securities.

The indebtedness evidenced by the subordinated debt securities of any series is subordinated, to the extent provided in the subordinated indenture and the applicable prospectus supplement, to the prior payment in full, in cash or other payment satisfactory to the holders of senior debt, of all senior debt, including any senior debt securities.

Upon any distribution of our assets upon any dissolution, winding up, liquidation or reorganization, whether voluntary or involuntary, marshalling of assets, assignment for the benefit of creditors, or in bankruptcy, insolvency, receivership or other similar proceedings, payments on the subordinated debt securities will be subordinated in right of payment to the prior payment in full in cash or other payment satisfactory to holders of senior debt of all senior debt.

In the event of any acceleration of the subordinated debt securities of any series because of an event of default with respect to the subordinated debt securities of that series, holders of any senior debt would be entitled to payment in full in cash or other payment satisfactory to holders of senior debt of all senior debt before the holders of subordinated debt securities are entitled to receive any payment or distribution.

In addition, the subordinated debt securities will be structurally subordinated to all indebtedness and other liabilities of our subsidiaries, including trade payables and lease obligations. This occurs because our right to receive any assets of our subsidiaries upon their liquidation or reorganization, and your right to participate in those assets, will be effectively subordinated to the claims of that subsidiary’s creditors, including trade creditors, except to the extent that we are recognized as a creditor of such subsidiary. If we are recognized as a creditor of that subsidiary, our claims would still be subordinate to any security interest in the assets of the subsidiary and any indebtedness of the subsidiary senior to us.

We are required to promptly notify holders of senior debt or their representatives under the subordinated indenture if payment of the subordinated debt securities is accelerated because of an event of default.

Under the subordinated indenture, we may also not make payment on the subordinated debt securities if:

No new payment blockage period may commence on the basis of a nonpayment default unless 365 days have elapsed from the effectiveness of the immediately prior payment blockage notice. No nonpayment default that existed or was continuing on the date of delivery of any payment blockage notice to the trustee shall be the basis for a subsequent payment blockage notice.

As a result of these subordination provisions, in the event of our bankruptcy, dissolution or reorganization, holders of senior debt may receive more, ratably, and holders of the subordinated debt securities may receive less, ratably, than our other creditors. The subordination provisions will not prevent the occurrence of any event of default under the subordinated indenture.

The subordination provisions will not apply to payments from money or government obligations held in trust by the trustee for the payment of principal, interest and premium, if any, on subordinated debt securities pursuant to the provisions described under the section entitled “Satisfaction and discharge; defeasance,” if the subordination provisions were not violated at the time the money or government obligations were deposited into trust.

If the trustee or any holder receives any payment that should not have been made to them in contravention of subordination provisions before all senior debt is paid in full in cash or other payment satisfactory to holders of senior debt, then such payment will be held in trust for the holders of senior debt.

Senior debt securities will constitute senior debt under the subordinated indenture.

Additional or different subordination provisions may be described in a prospectus supplement relating to a particular series of debt securities.

“Designated senior debt” means our obligations under any particular senior debt in which the instrument creating or evidencing the same or the assumption or guarantee thereof, or related agreements or documents to which we are a party, expressly provides that such indebtedness shall be designated senior debt for purposes of the subordinated indenture. The instrument, agreement or other document evidencing any designated senior debt may place limitations and conditions on the right of such senior debt to exercise the rights of designated senior debt.

“Indebtedness” means the following, whether absolute or contingent, secured or unsecured, due or to become due, outstanding on the date of the indenture for such series of securities or thereafter created, incurred or assumed:

“Senior debt” means the principal of, premium, if any, and interest, including all interest accruing subsequent to the commencement of any bankruptcy or similar proceeding, whether or not a claim for post-petition interest is allowable as a claim in any such proceeding, and rent payable on or in connection with, and all fees and other amounts payable in connection with, our indebtedness. However, senior debt shall not include:

“Subsidiary” means a corporation more than 50% of the outstanding voting stock of which is owned, directly or indirectly, by us or by one or more or our other subsidiaries or by a combination of us and our other subsidiaries. For purposes of this definition, “voting stock” means stock or other similar interests which ordinarily has or have voting power for the election of directors, or persons performing similar functions, whether at all times or only so long as no senior class of stock or other interests has or have such voting power by reason of any contingency.

We may issue rights to our stockholders to purchase shares of our common stock, preferred stock or the other securities described in this prospectus. We may offer rights separately or together with one or more additional rights, preferred stock, common stock, or warrants, or any combination of those securities in the form of units. Each series of rights will be issued under a separate rights agreement to be entered into between us and a bank or trust company, as rights agent. The rights agent will act solely as our agent in connection with the certificates relating to the rights of the series of certificates and will not assume any obligation or relationship of agency or trust for or with any holders of rights certificates or beneficial owners of rights. The following description sets forth certain general terms and provisions of the rights to which any prospectus supplement may relate. The particular terms of the rights to which any prospectus supplement may relate and the extent, if any, to which the general provisions may apply to the rights so offered will be described in the applicable prospectus supplement. To the extent that any particular terms of the rights, rights agreement or rights certificates described in a prospectus supplement differ from any of the terms described below, then the terms described below will be deemed to have been superseded by that prospectus supplement. We encourage you to read the applicable rights agreement and rights certificate for additional information before you decide whether to purchase any of our rights.

We will provide in a prospectus supplement the following terms of the rights being issued:

Each right will entitle the holder of rights to purchase for cash the principal amount of shares of common stock, preferred stock or other securities at the exercise price provided in the applicable prospectus supplement. Rights may be exercised at any time up to the close of business on the expiration date for the rights provided in the applicable prospectus supplement.

Holders may exercise rights as described in the applicable prospectus supplement. Upon receipt of payment and the rights certificate properly completed and duly executed at the corporate trust office of the rights agent or any other office indicated in the prospectus supplement, we will, as soon as practicable, forward the shares of common stock, preferred stock or other securities, as applicable, purchasable upon exercise of the rights. If less than all of the rights issued in any rights offering are exercised, we may offer any unsubscribed securities directly to persons other than stockholders, to or through agents, underwriters or dealers or through a combination of such methods, including pursuant to standby arrangements, as described in the applicable prospectus supplement.

The rights agent for any rights we offer will be set forth in the applicable prospectus supplement.

The following description, together with the additional information that we may include in any applicable prospectus supplements, summarizes the material terms and provisions of the units that we may offer under this prospectus. While the terms we have summarized below will apply generally to any units that we may offer under this prospectus, we will describe the particular terms of any series of units in more detail in the applicable prospectus supplement. The terms of any units offered under a prospectus supplement may differ from the terms described below.

We may issue units consisting of common stock, preferred stock, debt securities, one or more warrants or rights for the purchase of common stock, preferred stock or debt securities in one or more series, in any combination. Each unit will be issued so that the holder of the unit is also the holder of each security included in the unit. Thus, the holder of a unit will have the rights and obligations of a holder of each security included in the unit. The unit agreement under which a unit is issued may provide that the securities included in the unit may not be held or transferred separately, at any time or at any time before a specified date.

The summary of terms of the units contained in this section of the prospectus is not complete, and is subject to modification in any prospectus supplement for any issuance of units. We will describe in the applicable prospectus supplement the terms of the series of units being offered, including:

The name and address of the unit agent for any units we offer will be set forth in the applicable prospectus supplement.

We may issue units in such amounts and in such numerous distinct series as we determine.

Each unit agent will act solely as our agent under the applicable unit agreement and will not assume any obligation or relationship of agency or trust with any holder of any unit. A single bank or trust company may act as unit agent for more than one series of units. A unit agent will have no duty or responsibility in case of any default by us under the applicable unit agreement or unit, including any duty or responsibility to initiate any proceedings at law or otherwise, or to make any demand upon us. Any holder of a unit may, without the consent of the related unit agent or the holder of any other unit, enforce by appropriate legal action its rights as holder under any security included in the unit.

We, any unit agents and any of their agents may treat the registered holder of any unit certificate as an absolute owner of the units evidenced by that certificate for any purpose and as the person entitled to exercise the rights attaching to the units so requested, despite any notice to the contrary.

CERTAIN PROVISIONS OF NEVADA LAW AND OF THE COMPANY’S ARTICLES OF INCORPORATION AND BYLAWS

We may in the future become subject to Nevada’s control share laws. A corporation is subject to Nevada’s control share law if it has more than 200 stockholders of record, at least 100 of whom are residents of Nevada, and if the corporation does business in Nevada, including through an affiliated corporation. This control share law may have the effect of discouraging corporate takeovers. The Company currently has fewer than 100 stockholders of record who are residents of Nevada.

The control share law focuses on the acquisition of a “controlling interest,” which means the ownership of outstanding voting shares that would be sufficient, but for the operation of the control share law, to enable the acquiring person to exercise the following proportions of the voting power of the corporation in the election of directors: (1) one-fifth or more but less than one-third; (2) one-third or more but less than a majority; or (3) a majority or more. The ability to exercise this voting power may be direct or indirect, as well as individual or in association with others.

The effect of the control share law is that an acquiring person, and those acting in association with that person, will obtain only such voting rights in the control shares as are conferred by a resolution of the stockholders of the corporation, approved at a special or annual meeting of stockholders. The control share law contemplates that voting rights will be considered only once by the other stockholders. Thus, there is no authority to take away voting rights from the control shares of an acquiring person once those rights have been approved. If the stockholders do not grant voting rights to the control shares acquired by an acquiring person, those shares do not become permanent non-voting shares. The acquiring person is free to sell the shares to others. If the buyer or buyers of those shares themselves do not acquire a controlling interest, the shares are not governed by the control share law any longer.

If control shares are accorded full voting rights and the acquiring person has acquired control shares with a majority or more of the voting power, a stockholder of record, other than the acquiring person, who did not vote in favor of approval of voting rights for the control shares, is entitled to demand fair value for such stockholder’s shares.

In addition to the control share law, Nevada has a business combination law, which prohibits certain business combinations between Nevada corporations and “interested stockholders” for two years after the interested stockholder first becomes an interested stockholder, unless (a) the corporation’s board of directors approves the combination or transaction by which the person first becomes an interested stockholder in advance or (b) the corporation’s board of directors and at least 60% of the corporation’s disinterested stockholders approve the combination at an annual or special meeting. For purposes of Nevada law, an interested stockholder is any person who is: (a) the beneficial owner, directly or indirectly, of 10% or more of the voting power of the outstanding voting shares of the corporation, or (b) an affiliate or associate of the corporation and at any time within the previous two years was the beneficial owner, directly or indirectly, of 10% or more of the voting power of the then-outstanding shares of the corporation. The definition of “business combination” contained in the statute is sufficiently broad to cover virtually any kind of transaction that would allow a potential acquirer to use the corporation’s assets to finance the acquisition or otherwise to benefit its own interests rather than the interests of the corporation and its other stockholders.

The effect of Nevada’s business combination law is to potentially discourage a party interested in taking control of the Company from doing so if it cannot obtain the approval of our board of directors.

The authorized but unissued shares of common stock and preferred stock are available for future issuance without stockholder approval, subject to any limitations imposed by the listing standards of any exchange on which our shares are listed. These additional shares may be used for a variety of corporate finance transactions, acquisitions and employee benefit plans. The existence of authorized but unissued and unreserved common stock and preferred stock could make more difficult or discourage an attempt to obtain control of us by means of a proxy contest, tender offer, merger or otherwise.

Special Meeting of Stockholders; Advance Notice Requirements; Stockholder Action

Our by-laws provide that, except as otherwise required by law or the articles of incorporation, special meetings of the stockholders can only be called by our board of directors, by the chairman of our board of directors or by certain of our officers. In addition, our by-laws establish an advance notice procedure for stockholder proposals to be brought before an annual meeting of stockholders, including proposed nominations of candidates for election to our board of directors. Stockholders at an annual meeting may only consider proposals or nominations specified in the notice of the meeting or brought before the meeting by or at the direction of our board of directors, or by a stockholder of record on the record date for the meeting who is entitled to vote at the meeting and who has delivered timely written notice in proper form to our secretary of the stockholder's intention to bring such business before the meeting. These provisions could have the effect of delaying until the next stockholder meeting stockholder actions that are favored by the holders of a majority of our outstanding voting securities. In addition, our by-laws require that stockholder actions must be effected at a duly called stockholders meeting and prohibit actions by our stockholders by written consent.

Nevada Revised Statutes (NRS) Sections 78.7502 and 78.751 provide us with the power to indemnify any of our directors, officers, employees and agents. The person entitled to indemnification must have conducted himself in good faith, and must reasonably believe that his conduct was in, or not opposed to, our best interests. In a criminal action, the director, officer, employee or agent must not have had reasonable cause to believe that his conduct was unlawful.

Under NRS Section 78.751, advances for expenses may be made by agreement if the director or officer affirms in writing that he has met the standards for indemnification and will personally repay the expenses if it is determined that such officer or director did not meet those standards.

Our by-laws state that we shall indemnify every (i) present or former director, officer, employee or agent of us and (ii) any person who served at our request as a director, officer, member, manager, partner, trustee, fiduciary, employee or agent of another corporation, limited liability company, partnership, joint venture, trust, employee benefit plan or other enterprise (each an “Indemnitee”).

Our by-laws provide that we shall indemnify an Indemnitee against expenses, including attorneys’ fees and disbursements, and costs (and in connection with a proceeding other than a proceeding by or in the right of the Company, judgments, fines and amounts paid in settlement) actually and reasonably incurred by such person in connection with any proceeding in which such Indemnitee was, is or is threatened to be named as defendant or respondent, or in which he was or is a witness without being named a defendant or respondent, by reason, in whole or in part, of his serving or having served, or having been nominated or designated to serve, if it is determined that the Indemnitee (a) conducted himself in good faith and in a manner which such Indemnitee reasonably believed to be in or not opposed to our best interests, or with respect to any criminal proceeding, had no reasonable cause to believe that his conduct was unlawful or (b) is not liable pursuant to NRS Section 78.138; provided, however, that in the event that an Indemnitee is found liable to us, we will have no obligation to indemnify such Indemnitee unless, and only to the extent that the court in which such action or suit was brought or other court of competent jurisdiction determines that, in view of all the circumstances of the case, such person is fairly and reasonably entitled to indemnity for such expenses and costs as a court of competent jurisdiction or such other court shall deem proper.

The termination of any proceeding by judgment, order, settlement or conviction, or on a plea of nolo contendere or its equivalent, is not of itself determinative that the Indemnitee did not meet the requirements set forth in clauses (a) or (b) above. An Indemnitee shall be deemed to have been found liable in respect of any claim, issue or matter only after the Indemnitee shall have been so adjudged by a court of competent jurisdiction after exhaustion of all appeals therefrom.

In addition to our by-laws, have entered into an Indemnification Agreement with each of our directors and executive officers pursuant to which we are required to indemnify, and to advance expenses on behalf of, such persons to the fullest extent permitted by applicable law and our governing documents. We believe that entering into these agreements helps us to attract and retain highly competent and qualified persons to serve the Company.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to our directors, officers and controlling persons, we have been advised that in the opinion of the SEC, such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable.

Snell & Wilmer L.L.P., Reno, Nevada, will pass upon the validity of the issuance of the securities to be offered by this prospectus. If legal matters in connection with offerings made pursuant to this prospectus are passed upon by counsel for the underwriters, dealers or agents, if any, such counsel will be named in the prospectus supplement relating to such offering.

OUM & Co. LLP, independent registered public accounting firm, has audited our consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2019, as set forth in their report, which is incorporated by reference in this prospectus and elsewhere in the registration statement. Our financial statements are incorporated by reference in reliance on OUM & Co. LLP’s report, given on their authority as experts in accounting and auditing.

We are subject to the reporting requirements of the Securities Exchange Act of 1934, as amended, and file annual, quarterly and current reports, proxy statements and other information with the SEC. SEC filings are also available at the SEC’s web site at http://www.sec.gov.

We have filed with the SEC a registration statement under the Securities Act relating to the offering of these securities. The registration statement, including the attached exhibits, contains additional relevant information about us and the securities. This prospectus does not contain all of the information set forth in the registration statement. You can obtain a copy of the registration statement, at prescribed rates, from the SEC at the address listed above.

The registration statement and the documents referred to below under “Incorporation of Documents by Reference” are also available on our Internet website www.eksobionics.com. We have not incorporated by reference into this prospectus the information on our website, and you should not consider it to be a part of this prospectus.

The SEC allows us to incorporate by reference into this prospectus certain information we file with it, which means that we can disclose important information by referring you to those documents. The information incorporated by reference is considered to be a part of this prospectus, and information that we file later with the SEC will automatically update and supersede information contained in this prospectus and any accompanying prospectus supplement. We incorporate by reference the documents listed below that we have previously filed with the SEC (excluding any portions of any Form 8-K that are not deemed "filed" pursuant to the General Instructions of Form 8-K):

Any statement contained in this prospectus or in a document incorporated or deemed to be incorporated by reference into this prospectus will be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained in this prospectus or any other subsequently filed document that is deemed to be incorporated by reference into this prospectus modifies or supersedes the statement. Any statement so modified or superseded will not be deemed, except as so modified or superseded, to constitute a part of this prospectus.

We will provide to each person, including any beneficial owner, to whom this prospectus is delivered, upon written or oral request, at no cost to the requester, a copy of any or all of the information that is incorporated by reference in this prospectus. Requests for such documents should be directed to: Investor Relations, Ekso Bionics Holdings, Inc., 1414 Harbour Way South, Suite 1201, Richmond, California 94804, (510) 984-1761.

You may also access the documents incorporated by reference in this prospectus through our website at www.eksobionics.com. Except for the specific incorporated documents listed above, no information available on or through our website shall be deemed to be incorporated in this prospectus or the registration statement of which it forms a part.

This prospectus may contain information that updates, modifies or is contrary to information in one or more of the documents incorporated by reference in this prospectus. You should rely only on the information incorporated by reference or provided in this prospectus. We have not authorized anyone else to provide you with different information. You should not assume that the information in this prospectus is accurate as of any date other than the date of this prospectus or the date of the documents incorporated by reference in this prospectus.

The information in this prospectus supplement is not complete and may be changed. We may not sell these securities until the registration statement filed with the Securities and Exchange Commission is effective. This prospectus supplement is not an offer to sell these securities, and we are not soliciting offers to buy these securities, in any state or other jurisdiction where the offer or sale is not permitted.

This prospectus relates to the offer and sale by us of up to 1,158,939 shares of our common stock issuable from time to time upon the exercise of the following warrants to purchase common stock: (i) warrants to purchase 106,896 shares of common stock with an exercise price of $41.25 per share, expiring on December 23, 2020 (the “2015 Warrants”), (ii) warrants to purchase 444,444 shares of common stock with an exercise price of $3.52 per share, expiring on May 24, 2024 (the “May 2019 Warrants”), (iii) warrants to purchase 51,836 shares of common stock with an exercise price of $8.44, expiring on December 18, 2025 (the “December 2019 Placement Agent Warrants”) and (iv) warrants to purchase 555,763 shares of common stock with an exercise price of $8.10, expiring on June 21, 2025 (the “December 2019 Warrants” and, together with the 2015 Warrants, the May 2019 Warrants, and the December 2019 Placement Agent Warrants, the “Registered Warrants”).

Upon exercise of the Registered Warrants for cash, the holders of the Registered Warrants would pay us the exercise price per share of common stock, or an aggregate of approximately $10,913,080 if all of the Registered Warrants are exercised in full for cash.

Our common stock is traded on the Nasdaq Capital Market under the symbol “EKSO.” On June 15, 2020, the last reported sales price of our common stock was $3.78 per share.

Investing in our common stock involves a high degree of risk. You should review carefully the risks and uncertainties described under the heading “Risk Factors” on page S-8 of this prospectus and elsewhere in this prospectus for a discussion of information that should be considered in connection with an investment in our common stock.

NEITHER THE SECURITIES AND EXCHANGE COMMISSION NOR ANY STATE SECURITIES COMMISSION HAS APPROVED OR DISAPPROVED OF THESE SECURITIES OR DETERMINED IF THIS PROSPECTUS IS TRUTHFUL OR COMPLETE. ANY REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

This warrant exercise prospectus supplement and the accompanying base prospectus are part of a registration statement that we have filed with the Securities and Exchange Commission (“SEC”) utilizing a “shelf” registration process.

We provide information to you about this offering of shares of our common stock in two separate documents that are bound together: (1) this warrant exercise prospectus, which describes the specific details regarding this offering; and (2) the accompanying base prospectus, which provides general information, some of which may not apply to this offering. Generally, when we refer to this “prospectus,” we are referring to both documents combined. If information in this warrant exercise prospectus supplement is inconsistent with the accompanying base prospectus, you should rely on this prospectus supplement. However, if any statement in one of these documents is inconsistent with a statement in another document having a later date—for example, a document incorporated by reference in this prospectus—the statement in the document having the later date modifies or supersedes the earlier statement as our business, financial condition, results of operations and prospects may have changed since the earlier dates.

We further note that the representations, warranties and covenants made by us in any agreement that is filed as an exhibit to any document that is incorporated by reference in this prospectus were made solely for the benefit of the parties to such agreement, including, in some cases, for the purpose of allocating risk among the parties to such agreement, and should not be deemed to be a representation, warranty or covenant to you. Moreover, such representations, warranties or covenants were accurate only as of the date when made. Accordingly, such representations and warranties should not be relied on as accurately representing the current state of our affairs or obligations.

You should rely only on the information contained in, or incorporated by reference into, this prospectus and in any free writing prospectus that we may authorize for use in connection with this offering. We have not, and the sales agent has not, authorized any other person to provide you with different information. If anyone provides you with different or inconsistent information, you should not rely on it. We are not, and the sales agent is not, making an offer to sell or soliciting an offer to buy our securities in any jurisdiction in which an offer or solicitation is not authorized or in which the person making that offer or solicitation is not qualified to do so or to anyone to whom it is unlawful to make an offer or solicitation. You should assume that the information appearing in this prospectus, the documents incorporated by reference into this prospectus, and in any free writing prospectus that we may authorize for use in connection with this offering, is accurate only as of the date of those respective documents. Our business, financial condition, results of operations and prospects may have changed since those dates.

You should read this prospectus, the documents incorporated by reference into this prospectus, and any free writing prospectus that we may authorize for use in connection with this offering, in their entirety before making an investment decision. You should also read and consider the information in the documents to which we have referred you in the sections of this prospectus entitled “Where You Can Find More Information” and “Incorporation of Certain Documents By Reference.”

We are offering to sell, and seeking offers to buy, shares of common stock only in jurisdictions where offers and sales are permitted. The distribution of this prospectus and the offering of the common stock in certain jurisdictions may be restricted by law. Persons outside the United States who come into possession of this prospectus must inform themselves about, and observe any restrictions relating to, the offering of the common stock and the distribution of this prospectus outside the United States. This prospectus does not constitute, and may not be used in connection with, an offer to sell, or a solicitation of an offer to buy, any securities offered by this prospectus by any person in any jurisdiction in which it is unlawful for such person to make such an offer or solicitation.

For purposes of this prospectus, references to the terms “Ekso Bionics,” “the Company,” “we,” “us” and “our” refer to Ekso Bionics Holdings, Inc., unless the context otherwise requires.

This prospectus and the information incorporated by reference herein and therein include trademarks, service marks and trade names owned by us or other companies. All trademarks, service marks and trade names included or incorporated by reference into this prospectus are the property of their respective owners.

The following summary highlights certain information contained elsewhere in this warrant exercise prospectus supplement, the accompanying base prospectus, any free writing prospectus that we have been authorized to use and the documents incorporated by reference herein and in the accompanying base prospectus. This summary does not contain all the information you will need in making your investment decision. You should carefully read this entire prospectus supplement the accompanying base prospectus, any free writing prospectus that we have been authorized to use and the documents incorporated by reference herein and in the accompanying base prospectus. You should pay special attention to the “Risk Factors” section of this prospectus and the financial statements and other information incorporated by reference in this prospectus.

Ekso Bionics designs, develops and sells exoskeleton technology to augment human strength, endurance and mobility. Our exoskeleton technology serves multiple markets and can be used both by able-bodied persons as well as by persons with physical disabilities. We have sold or leased devices that (i) enable individuals with neurological conditions affecting gait (stroke and spinal cord injury to rehabilitate, and in some cases, to walk again, (ii) assist individuals with a broad range of upper extremity impairments, and (iii) allow industrial workers to perform difficult repetitive work for extended periods.

We believe that the commercial opportunity for exoskeleton technology adoption is accelerating as a result of recent advancements in material technologies, electronic and electrical engineering, control technologies, and sensor and software development. Taken individually, many of these advancements have become ubiquitous in peoples’ everyday lives. We believe that we have learned how to integrate these existing technologies and wrap the result around a human being efficiently, elegantly and safely, supported by an industry-leading intellectual property portfolio. We further believe that we can do so across a broad spectrum of applications, from persons with lower limb paralysis to able-bodied users.

Additional details of these programs and related strategic agreements are contained in our Annual Report on Form 10-K for the year ended December 31, 2019, our Quarterly Report on Form 10-Q for the quarter ended March 31, 2020, as well as in reports subsequently filed with the SEC.

Our corporate headquarters are located in Richmond, California 94804. Our telephone number is (510) 984-1761, and our website address is www.eksobionics.com. Our official Twitter account is @EksoBionics. The information on or accessible through our website or our Twitter account does not constitute part of this prospectus supplement or the accompanying prospectus and should not be relied upon in connection with making any investment in our securities.

The common stock of Ekso Bionics is listed on the Nasdaq Capital Market (“Nasdaq”) under the symbol “EKSO.”

This prospectus relates to the offer and sale by us of up to 1,158,939 shares of our common stock issuable from time to time upon exercise of the Registered Warrants: (i) the 2015 Warrants have an exercise price of $41.25 per share and expire on December 23, 2020; (ii) the May 2019 Warrants have an exercise price of $3.52 and expire on May 24, 2024; (iii) the December 2019 Placement Agent Warrants have an exercise price of $8.44 and expire on December 18, 2025; and (iv) the December 2019 Warrants have an exercise price of $8.10 and expire on June 21, 2025. The exercise price per share of the Registered Warrants is subject to adjustment pursuant to the terms of the Registered Warrants.

We are filing this warrant exercise prospectus supplement pursuant to certain agreements we have entered into with the holders of the Registered Warrants that require us to keep a registration statement registering the issuance or resale of the shares of our common stock issuable upon exercise of the Registered Warrants.

The following is a summary of certain material terms of the Registered Warrants. This summary does not purport to be a complete summary of all terms and conditions of the Registered Warrants and is subject in all respects to the provisions contained in such Registered Warrants:

Exercisability. The 2015 Warrants may be exercised at any time at an exercise price of $41.25 per share and are exercisable until December 23, 2020. The 2015 Warrants are exercisable, at the option of each holder, in whole or in part by delivering to the warrant agent a duly executed exercise notice accompanied by payment in full for the number of shares of our common stock purchased upon such exercise. The exercise price and the number of shares issuable upon exercise of the 2015 Warrants is subject to further adjustment in the event of recapitalization, stock dividends, stock splits, stock combinations, reclassifications, reorganizations or similar events affecting our common stock, and also upon any distributions of assets, including cash, stock or other property to our stockholders. The 2015 Warrant holders must pay the exercise price of such warrants in cash upon exercise, unless at the time of exercise there is no effective registration statement registering (or the prospectus contained therein is not available for) the offer and sale of the shares underlying the 2015 Warrants and such 2015 Warrant holders are utilizing the cashless exercise provision of the 2015 Warrants.

Exercise Limitations. Subject to limited exceptions, a holder of 2015 Warrants will not have the right to exercise any portion of its warrants if the holder, together with its affiliates, would beneficially own in excess of 4.99% of the number of shares of our common stock outstanding immediately after giving effect to such exercise; provided, however, that upon 61 days’ prior notice to us, the holder may increase or decrease the beneficial ownership limitation, provided that in no event shall the beneficial ownership limitation exceed 9.99%.

Transferability. Subject to applicable laws, the 2015 Warrants are tradeable at the option of the holders of such warrants and may be transferred at the option of the holders.

No Listing. There is no established public trading market for the 2015 Warrants and we do not expect a market to develop. In addition, we do not intend to apply for listing of the 2015 Warrants on any securities exchange or recognized trading system, including Nasdaq. Without an active market, the liquidity of the warrants will be limited.

Fundamental Transactions. Before entering into any “fundamental transaction,” as defined in the form of 2015 Warrants, which generally includes any reorganization, recapitalization or reclassification of our common stock; the sale, transfer or other disposition of all or substantially all of our properties or assets; our consolidation or merger with or into another person; the acquisition of more than 50% of our outstanding common stock; or any person or group becoming the beneficial owner of 50% of the voting power represented by our outstanding common stock, the holders of the 2015 Warrants have the right to receive the number of shares of common stock of the successor or acquiring corporation or of us, and any additional consideration receivable as a result of such transaction that the holders would have received had they exercised the warrants immediately prior to such transaction. In the event of a fundamental transaction, we or the surviving entity will pay, at the holder's election, an amount of cash equal to the value of the warrant as determined in accordance with the Black Scholes option pricing model and the terms of the 2015 Warrants.

Cashless Exercise. If, at the time a holder exercises its warrant, there is no effective registration statement registering, or the prospectus contained therein is not available for an issuance of the shares underlying the warrant to the holder, and the holder is not able to sell the shares issuable upon exercise of the warrant without limitations on volume pursuant to Rule 144 of the Securities Act, then in lieu of making the cash payment otherwise contemplated to be made to us upon such exercise in payment of the aggregate exercise price, the holder may elect instead to receive upon such exercise (either in whole or in part) the net number of shares of our common stock determined according to a formula set forth in the warrant. In the event of a cashless exercise, if we fail to timely deliver the shares underlying the 2015 Warrants, we will be subject to certain buy-in provisions.

Rights as a Stockholder. Except as otherwise provided in the warrant or by virtue of a holder's ownership of shares of our common stock, the holders of the 2015 Warrants do not have the rights or privileges of holders of our common stock, including any voting rights, until they exercise their warrants.

Amendments. Amendments and waivers of the terms of any warrant requires the written consent of the holder of such warrant.

No Fractional Shares. No fractional shares or scrip representing fractional shares shall be issued upon the exercise of the 2015 Warrants. As to any fraction of a share which the holder would otherwise be entitled to purchase upon such exercise, we shall cause the warrant agent to, at our option, pay a cash adjustment in respect of such final fraction in an amount equal to such fraction multiplied by the exercise price of the warrant per whole share or round such fractional share up to the nearest whole share.

Exercisability. The May 2019 Warrants may be exercised at any time on or after their date of issuance, currently have an exercise price of $3.52 per share and are exercisable until the fifth year anniversary of the original issuance date. The May 2019 Warrants are exercisable, at the option of each holder, in whole or in part by delivering to the warrant agent a duly executed exercise notice accompanied by payment in full for the number of shares of our common stock purchased upon such exercise. The exercise price of the warrant is subject to adjustment in the event of stock dividends and distributions, stock splits, stock combinations, reclassifications or similar events affecting our common stock.

Exercise Limitations. A holder of a warrant will not have the right to exercise any portion of the warrant if the holder (together with its affiliates) would beneficially own in excess of 4.99% of the number of shares of our common stock outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the May 2019 Warrants. However, any holder may increase or decrease such percentage to any other percentage not in excess of 9.99% upon at least 61 days' prior notice from the holder to us.

Transferability. Subject to applicable laws, the May 2019 Warrants are separately tradeable immediately after issuance at the option of the holders of such warrants and may be transferred at the option of the holders. The May 2019 Warrants will be issued in book-entry form under a warrant agreement between the warrant agent and us, and shall initially be represented by one or more book-entry certificates deposited with The Depository Trust Company, or DTC, and registered in the name of Cede & Co., a nominee of DTC, or as otherwise directed by DTC.

No Listing. There is no established public trading market for the May 2019 Warrants and we do not expect a market to develop. In addition, we do not intend to apply for listing of the May 2019 Warrants on any securities exchange or recognized trading system, including Nasdaq. Without an active market, the liquidity of the May 2019 Warrants will be limited.

Fundamental Transactions. Before entering into any “fundamental transaction,” as defined in the form of warrant and generally including any reorganization, recapitalization or reclassification of our common stock, the sale, transfer or other disposition of all or substantially all of our properties or assets, our consolidation or merger with or into another person, the acquisition of more than 50% of our outstanding common stock, or any person or group becoming the beneficial owner of 50% of the voting power represented by our outstanding common stock, we must cause the successor entity to us to agree to provide the right to the holders of the May 2019 Warrants to receive, upon exercise of such warrants, the kind and amount of securities, cash or other property that the holders would have received had they exercised the warrants immediately prior to such fundamental transaction. In the event of a fundamental transaction of which we are not the surviving entity and certain other fundamental transactions, we or any successor entity will pay, at the holder's option, exercisable at any time concurrently with or within 90 days after the consummation of the fundamental transaction, an amount of cash equal to the value of the warrant as determined in accordance with the Black Scholes option pricing model and the terms of the May 2019 Warrants.

Cashless Exercise. If, at the time a holder exercises its warrant, there is no effective registration statement registering, or the prospectus contained therein is not available for an issuance of the shares underlying the warrant to the holder, and the holder is not able to sell the shares issuable upon exercise of the warrant without limitations on volume pursuant to Rule 144 of the Securities Act, then in lieu of making the cash payment otherwise contemplated to be made to us upon such exercise in payment of the aggregate exercise price, the holder may elect instead to receive upon such exercise (either in whole or in part) the net number of shares of our common stock determined according to a formula set forth in the warrant. In the event of a cashless exercise, if we fail to timely deliver the shares underlying the May 2019 Warrants, we will be subject to certain buy-in provisions.

Rights as a Stockholder. Except as otherwise provided in the warrant or by virtue of a holder's ownership of shares of our common stock, the holders of the May 2019 Warrants do not have the rights or privileges of holders of our common stock, including any voting rights, until they exercise their warrants.

Anti-Dilution. The May 2019 Warrants contain a price protection feature, pursuant to which, to the extent such warrants have not been exercised previously, if shares of common stock are sold or issued in the future, or securities convertible or exercisable for shares of our common stock are sold or issued in the future, for consideration, or with an exercise price or conversion price, as applicable, per share less than the exercise price per share then in effect, the per share exercise price of the May 2019 Warrants will be reduced to the consideration received by us for, or the exercise price or conversion price of, as the case may be, the securities issued in such offering. In the case where a unit consisting of our securities (the “primary securities”) and an option or other securities converted into or exercisable for shares of our common stock (the “secondary securities”) are issued, then the consideration received by us will be calculated as the lower of (x) the consideration paid for one unit in the offering, (y) in case of primary securities that are options or other securities convertible or exercisable for our common stock, the exercise or conversion price of the primary securities, and (z) the lowest one-day volume-weighted average price of our common stock on the Nasdaq Capital Market as measured each day during the five trading day period immediately following the public announcement of such offering. Certain exceptions apply to this price protection feature.

Variable Price Transactions. If we effect or enter into any issuance of common stock or options or convertible securities exercisable for or convertible into our common stock at a price which varies or may vary with the market price of the shares of our common stock, subject to certain exceptions, a warrant holder may, at the time of exercise of the holder’s warrant, elect to exercise the warrant at such variable price.

Amendments. Amendments and waivers of the terms of any warrant requires the written consent of the holder of such warrant.

No Fractional Shares. No fractional shares or scrip representing fractional shares shall be issued upon the exercise of the May 2019 Warrants. As to any fraction of a share which the holder would otherwise be entitled to purchase upon such exercise, we shall cause the warrant agent to, at our option, pay a cash adjustment in respect of such final fraction in an amount equal to such fraction multiplied by the exercise price of the warrant per whole share or round such fractional share up to the nearest whole share.

Exercise Price. The exercise price per whole share of common stock purchasable upon exercise of the December 2019 Warrants is $8.10. The exercise price of the December 2019 Warrants is subject to adjustment in the event of, among other things, certain stock dividends and distributions, stock splits, stock combinations, reclassifications, reorganizations or similar events affecting our common stock and also upon any distribution of assets, including cash, stock or other property, to our stockholders.

Exercisability. The December 2019 Warrants are exercisable commencing six months and one day after the date of issuance and will expire on the date that is five years from the date when the December 2019 Warrants become first exercisable. The December 2019 Warrants will be exercisable, at the option of each holder, in whole or in part by delivering to us a duly executed exercise notice and payment in full of the exercise price by the Warrant Share Delivery Date (as defined in the December 2019 Warrant). If a registration statement registering the issuance of the shares of common stock underlying the December 2019 Warrants under the Securities Act is not effective or available, the holder may, in its sole discretion, elect to exercise the December 2019 Warrants through a cashless exercise, in which case the holder would receive upon such exercise the net number of shares of common stock determined according to the formula set forth in the December 2019 Warrants. No fractional shares of common stock will be issued in connection with the exercise of an December 2019 Warrant and the Company shall round up to the next whole share, if applicable.

Exercise Limitation. A holder will not have the right to exercise any portion of the December 2019 Warrant if the holder (together with its affiliates) would beneficially own in excess of 4.99% of the number of shares of our common stock outstanding immediately after giving effect to the exercise, as such percentage ownership is determined in accordance with the terms of the December 2019 Warrants. However, a holder may increase or decrease such percentage to any other percentage not in excess of 9.99% upon notice to us, provided that any increase in the beneficial ownership limitation shall not be effective until 61 days following notice to us.

Cashless Exercise. If, at the time a holder exercises its December 2019 Warrants, a registration statement registering the issuance of the shares of common stock underlying the December 2019 Warrants under the Securities Act is not then effective or available for the issuance of such shares, then in lieu of making the cash payment otherwise contemplated to be made to us upon such exercise in payment of the aggregate exercise price, the holder may elect to instead receive upon such exercise (either in whole or in part) the net number of Shares of common stock determined according to a formula set forth in the December 2019 Warrant. The December 2019 Warrants will be automatically exercised on a cashless basis on the expiration date of such December 2019 Warrant.

Transferability. Subject to applicable laws, the December 2019 Warrants, in whole or in part, may be offered for sale, sold, transferred or assigned without our consent. The December 2019 Warrants will be issued separately from the common stock pursuant to this offering and may be transferred separately immediately thereafter.

Exchange Listing. We do not plan on applying to list the December 2019 Warrants on Nasdaq or any other national securities exchange or any other nationally recognized trading system.

Fundamental Transactions. In the event of a fundamental transaction, as described in the December 2019 Warrants and generally including any (i) merger or consolidation with or into another person, (ii) the sale, lease, license, assignment, transfer, conveyance or other disposition of all or substantially all of our assets, (iii) the completion of a purchase, tender or exchange offer pursuant to which holders of our common stock are permitted to sell, transfer or exchange their shares for other securities, cash or property and has been accepted by the holders of 50% or more of our outstanding common stock, (iv) the reclassification, reorganization, or recapitalization of common stock, or the (v) the entry into a share purchase agreement or other business combination, including a reorganization, recapitalization, spin-off, merger or scheme of arrangement, with any person or group whereby such person or group acquires more than 50% of the outstanding shares of common stock , the holders of the December 2019 Warrants will be entitled to receive upon exercise of the December 2019 Warrants the kind and amount of securities, cash or other property that the holders would have received had they exercised the December 2019 Warrants immediately prior to such fundamental transaction. Alternatively, in the event of a fundamental transaction, at the holder’s election, the Company will purchase the December 2019 Warrant from the holder for an amount in cash equal to the Black Scholes value of such December 2019 Warrant.

Rights as a Stockholder. Except as otherwise provided in the December 2019 Warrants or by virtue of such holder’s ownership of shares of our common stock, the holder of an December 2019 Warrant does not have the rights or privileges of a holder of our common stock, including any voting rights, until the holder exercises the December 2019 Warrant.

Amendments. The December 2019 Warrants may be modified or amended with the written consent of the Company and either (i) the holder or (ii) the holders of December 2019 Warrants issued pursuant to the purchase agreement representing 80% of the shares subject to the December 2019 Warrants.

The December 2019 Placement Agent Warrants have substantially the same terms as the December 2019 Warrants described above, except that the December 2019 Placement Agent Warrants have (i) an exercise price of $8.44 per share, (ii) have a term of five years from the effective date of the original offering, (iii) are not transferable for 180 days from the date of effectiveness or commencement of sales of the original offering, or until June 15, 2020, pursuant to FINRA Rule 5110(g)(1), except in certain circumstances described in the Placement Agent Warrants, and (iv) may be modified or amended with the written consent of the Company and either (A) the holder or the (B) holders of Placement Agent Warrants issued pursuant to the engagement letter representing at least 66% of the shares subject to the Placement Agent Warrants.

Investing in our securities involves a high degree of risk. You should carefully consider the specific risks described below, as well as the other information contained in this prospectus and the other documents incorporated by reference, before making an investment decision. See the sections of this prospectus entitled “Where You Can Find More Information” and “Incorporation of Certain Documents By Reference.” Any of the risks we describe below or in the information incorporated herein by reference in this prospectus could cause our business, financial condition or operating results to suffer. The market price of our common stock could decline if one or more of these risks and uncertainties develop into actual events. You could lose all or part of your investment.

Management will have broad discretion as to the use of proceeds from this offering and may invest or spend the proceeds in ways with which you do not agree and in ways that may not increase the value of your investment.

Our management will have broad discretion over the use of proceeds from the exercise of the Registered Warrants, if any, including for any of the purposes described in the section of this prospectus entitled “Use of Proceeds,” and could spend the proceeds in ways that do not improve our results of operations or enhance the value of our common stock. You may not agree with our decisions, and our use of the proceeds may not yield any return on your investment. Our failure to apply the net proceeds from the exercise of the Registered Warrants, if any, effectively could have a material adverse effect on our business, delay the development of our products, compromise our ability to pursue our business strategy, and cause the price of our common stock to decline, and we might not be able to yield a significant return, if any, on our investment of these net proceeds. In addition, the net proceeds from the exercise of the Registered Warrants, if any, may not be sufficient for our anticipated uses, and we may need additional resources to progress our product candidates to the stage we expect. You will not have the opportunity to influence our decisions on how to use our net proceeds.

You will experience immediate dilution in the book value per share of the common stock you purchase.

Because the exercise price per share of the Registered Warrants is substantially higher than the net tangible book value per share of our common stock, you will suffer substantial dilution in the net tangible book value of the common stock you purchase upon exercise of your Registered Warrants. If you purchase shares of common stock by exercising your Registered Warrants, you will suffer immediate and substantial dilution of $39.66 per share (in the case of the 2015 Warrants), $2.47 per share (in the case of the May 2019 Warrants), $6.61 per share (in the case of the December 2019 Warrants) and $7.51 per share (in the case of the December 2019 Placement Agent Warrants), in each case in the pro forma net tangible book value of the common stock you purchase in this offering, measured as of March 31, 2020. See “Dilution” on page S-14 of this warrant exercise prospectus supplement for a more detailed discussion of the dilution you will incur if you exercise your Registered Warrants.

You may experience future dilution as a result of future equity offerings.

In order to raise additional capital, we may in the future offer additional shares of our common stock or other securities convertible into or exchangeable for our common stock. We cannot assure you that we will be able to sell shares or other securities in any other offering at a price per share that is equal to or greater than the applicable exercise price per share of the Registered Warrants held by you, and investors purchasing shares or other securities in future offerings could have rights superior to existing stockholders and warrant holders. A significant portion of our total outstanding shares are eligible to be sold into the market, which could cause the market price of our common stock to drop significantly, even if our business is doing well.

Sales of a significant number of shares of our common stock in the public markets, or the perception that such sales could occur, could depress the market price of our common stock.

Sales of a substantial number of shares of our common stock, or other equity-related securities in the public markets, or the perception that such sales could occur, could depress the market price of our common stock and impair our ability to raise capital through the sale of additional equity securities. Assuming that all the Registered Warrants are exercised, based upon the shares outstanding as of March 31, 2020, we will have outstanding an aggregate of 7,002,381 shares of common stock, assuming no exercise of outstanding stock options, no settlement of restricted stock units, no exercises of any other warrants to purchase our common stock and no other sales or issuances of our common stock. A substantial majority of the outstanding shares of our common stock are, and all of the shares sold upon exercise of the Registered Warrants will be, freely tradable without restriction or further registration under the Securities Act of 1933, as amended (the “Securities Act”), unless these shares are owned or purchased by “affiliates” as that term is defined in Rule 144 under the Securities Act.

In addition, we have also registered all of the shares of common stock that we may issue pursuant to the exercise of outstanding stock options and settlement of restricted stock units granted under our Amended and Restated 2014 Equity Incentive Plan, or 2014 Incentive Plan, and all of the shares of common stock that we may issue under our Amended and Restated 2014 Equity Incentive Plan Employee Stock Purchase Plan, or ESPP. As of March 31, 2020, 349,215 shares of our common stock were reserved for issuance of future awards under our 2014 Incentive Plan and 500,000 shares of common stock were reserved for issuance under our ESPP. As a result, these shares can be freely sold in the public market upon issuance, subject to restrictions related to affiliate sales under the securities laws. Additionally, as of March 31, 2020, 13,333 shares of common stock were issuable upon the exercise of outstanding warrants other than the Registered Warrants at an exercise price of $22.50 per share. These shares will only be freely tradable after issuance if registered in the future under the Securities Act or in reliance on any available exemptions from the registration requirement of the Securities Act.

Further, the May 2019 Warrants contain price-based anti-dilution adjustment provisions. Future anti-dilution adjustments to such warrants may result in substantial additional dilution to existing stockholders and may depress the market price of our common stock. The issuance of the shares of common stock underlying these warrants, or perception that issuance may occur, will have a dilutive impact on other stockholders and could have a material negative effect on the market price of our common stock.

The exercise prices of the Registered Warrants were determined by us in negotiation with a lead investor or underwriters in the relevant offerings in which the warrants were sold, and may not be indicative of the actual value of our common stock.

We determined the exercise price of each series of Registered Warrants in negotiation with a lead investor or the underwriters in the relevant offerings in which the warrants were sold. These exercise prices may not be indicative of the actual value of our common stock. The warrant exercise prices bear no relationship to the assets, book value, net worth or any other recognized criteria of our value.

We do not currently intend to pay dividends on our common stock, and any return to investors is expected to come, if at all, only from potential increases in the price of our common stock.

At the present time, we intend to use available funds to finance our operations. Accordingly, while payment of dividends rests within the discretion of our board of directors (subject to any contractual restrictive covenants, such those in our loan agreement with the Western Alliance Bank), we have no current intention of paying any such dividends in the foreseeable future. Any return to investors is expected to come, if at all, only from potential increases in the price of our common stock.

The recently announced Committee on Foreign Investment in the United States determination requires us to terminate our China JV, which will adversely impact our ability to expand operations globally and in particular, in China.

On January 30, 2019, we and our wholly-owned subsidiary, Ekso Bionics, Inc. (“Ekso US”), entered into an agreement with Zhejiang Youchuang Venture Capital Investment Co., Ltd (“ZYVC”) and another partner (collectively, the “JV Partners”), as amended by the Amendment to the Joint Venture Agreement, dated April 30, 2019 (as amended, the “JV Agreement”) to establish Exoskeleton Intelligent Robotics Co. Limited (the “China JV”), a Chinese limited liability company designed to develop and serve the exoskeleton market in China and other Asian markets and to create a global exoskeleton manufacturing center in the Zhejiang Province of China. In connection with the China JV, the JV Partners and their affiliates agreed to purchase an aggregate of 204,499 shares of our common stock at a price per share equal to $24.45, for aggregate proceeds to us of $5.0 million.

As previously disclosed, following U.S. governmental inquiries regarding the China JV, the Company and the China JV formally submitted a joint voluntary notice to Committee on Foreign Investment in the United States (“CFIUS”) in December 2019 to review the transaction. CFIUS subsequently inquired about our legacy work for the U.S. government as well as technology transfers and other aspects of the China JV and, in February 2020, imposed interim measures to mitigate identified concerns pending completion of its investigation. These measures temporarily suspended the Company’s contributions to the China JV and other integration activities for the China JV.

On May 19, 2020, we received notice from CFIUS in connection with its review of the Company’s and the JV Partners’ investment the China JV. The notice states that CFIUS’s prior national security concerns regarding the JV could not be mitigated and, in connection with its determination, CFIUS presented the Company and the JV Partners with a draft National Security Agreement (“NSA”), which will, among other things, require the termination of the Company’s role with the China JV. The Company intends to work cooperatively with the JV Partners and CFIUS to finalize the terms of the NSA. In the event the parties cannot agree on the NSA’s terms, CFIUS will refer the matter to the President of the United States, who very likely will order the termination of the China JV and the divestment of the shares acquired in connection with the China JV, per the President’s authority under the Defense Production Act.

Although the termination of the China JV is not expected to have a material impact on the Company’s operations during the remainder of 2020, if the Company is unable to efficiently identify and partner with other global manufacturing sources and Asia-based distributors, we may not be able to reduce the cost of manufacturing our products or increase sales in Asia in a cost-effective manner, which could have a material adverse effect on our financial results in future periods.

This prospectus and the documents we incorporate by reference in this prospectus contain forward-looking statements within the meaning of Section 27A of the Securities Act and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements, other than statements of historical facts, included or incorporated in this prospectus regarding our strategy, future operations, financial position, future revenues, projected costs, prospects, plans and objectives of management are forward-looking statements. We may, in some cases, use words such as “believe,” “anticipate,” “should,” “intend,” “plan,” “will,” “estimate,” “project,” “expect” and similar expressions, although not all forward-looking statements contain these identifying words. These statements are based on assumptions and assessments made by our management in light of its experience and its perception of historical trends, current conditions, expected future developments and other factors our management believes to be appropriate. These forward-looking statements are subject to a number of risks and uncertainties, including those risks described or incorporated by reference in this prospectus under “Risk Factors” above.

Forward-looking statements included or incorporated by reference in this prospectus include, for example, statements about:

Any such forward-looking statements are not guarantees of future performance and actual results and developments and business decisions may differ from those contemplated by such forward-looking statements. We disclaim any duty to update any forward-looking statements. You should also carefully consider other information set forth in reports or other documents that we file with the Securities and Exchange Commission.

We will receive proceeds only if the holders of the Registered Warrants choose to exercise the warrants for cash and after deducting the placement agent fees and estimated offering expenses payable by us. Accordingly, we cannot guarantee we will receive any proceeds from this offering.

We intend to use the net proceeds, if any, from the exercise of the Registered Warrants for general corporate purposes, which may include acquisitions, research and development activities, capital expenditures, selling, general and administrative costs, facilities expansion, and to meet working capital needs. We expect from time to time to evaluate the acquisition of businesses, products and technologies for which a portion of the net proceeds from the exercise of the Registered Warrants, if any, may be used.

The amounts and timing of our actual expenditures may vary significantly depending on numerous factors, including the amount and timing of the proceeds from this offering and progress with the achievement of our corporate goals. Expenditures will also depend upon the establishment and maintenance of manufacturing and supply chains, the availability of additional financing and other factors. We, therefore, cannot estimate with certainty the amount of net proceeds to be used for the purposes described above. We may find it necessary or advisable to use the net proceeds, if any, from the exercise of the Registered Warrants for other purposes, and we will have broad discretion in the application of any such net proceeds. Investors will be relying on the judgment of our management regarding the application of the proceeds of any sale of shares of our common stock.

Pending the use of the net proceeds, if any, as described above, we may invest such net proceeds in a variety of capital preservation investments, including short- and intermediate-term, interest-bearing obligations, investment-grade instruments or U.S. government securities.

Our net tangible book value as of March 31, 2020 was approximately $5.0 million, or $0.86 per share. Net tangible book value per share is determined by dividing our total tangible assets, less total liabilities, by the number of shares of our common stock outstanding as of March 31, 2020. Dilution with respect to net tangible book value per share represents the difference between the amount per share paid by purchasers of shares of common stock in this offering and the net tangible book value per share of our common stock immediately after this offering.

After giving effect to the assumed sale of all shares of our common stock upon exercise of all Registered Warrants for gross proceeds of $10,913,080 at a weighted-average exercise prices of $9.42 per share, and assuming no offering commissions or expenses payable by us, our as-adjusted net tangible book value as of March 31, 2020 would have been approximately $16.0 million, or $2.28 per share of common stock. This represents an immediate increase in net tangible book value of $1.42 per share to existing stockholders and immediate dilution of $7.14 per share on a weighted-average basis to investors purchasing our common stock by exercising the Registered Warrants.

The following table illustrates this dilution on a per share basis due to the exercise of each series of Registered Warrants (in each case, except where indicated in respect of all Registered Warrants, assuming the full exercise only of that series of Registered Warrants):

The above discussion and tables are based on 5,843,442 shares of our common stock outstanding as of March 31, 2020, and exclude as of March 31, 2020:

To the extent that options or warrants outstanding as of March 31, 2020 as noted above have been or may be exercised or other shares issued, investors purchasing our common stock in this offering may experience further dilution. In addition, we may choose to raise additional capital due to market conditions or strategic considerations even if we believe we have sufficient funds for our current or future operating plans. To the extent that additional capital is raised through the sale of equity or convertible debt securities, the issuance of these securities could result in further dilution to our stockholders.

We have never declared or paid cash dividends on our Common Stock and do not intend to pay cash dividends in the foreseeable future. Payment of future dividends, if any, will be at the discretion of our board of directors after taking into account various factors, including our financial condition, operating results, restrictions imposed by financing arrangements, if any, legal and regulatory restrictions on the payment of dividends, current and anticipated cash needs and other factors the board of directors deems relevant.

Our loan and security agreement with Western Alliance Bank contains a restrictive covenant that prohibits us and our subsidiaries, subject to certain exceptions, from paying dividends or making any other distribution or payment with respect to our capital stock.

The 1,158,939 shares of common stock referenced on the cover page of this prospectus will be issued and sold only upon the exercise of the Registered Warrants by a holder of such warrants. We will pay all expenses incident to the registration of the issuance and sale of the shares of common stock issuable upon exercise of the Registered Warrants.

As of the date of this warrant exercise prospectus supplement, Registered Warrants to purchase an aggregate of 1,158,939 shares of our common stock are issued and outstanding, of which (a) 106,896 shares of common stock are issuable upon exercise of the 2015 Warrants at an exercise price of $41.25 per share, (b) 444,444 shares of common stock are issuable upon exercise of the May 2019 Warrants at an exercise price of $3.52 per share, (c) 51,836 shares of common stock are issuable upon exercise of the December 2019 Placement Agent Warrants at an exercise price of $8.44, and (d) 555,763 shares of common stock are issuable upon exercise of the December 2019 Warrants at an exercise price of $8.10 per share.

The validity of the securities being offered by this warrant exercise prospectus supplement and the accompanying base prospectus will be passed upon by Snell & Wilmer L.L.P, Reno, Nevada.

The consolidated balance sheets of Ekso Bionics Holdings, Inc. as of December 31, 2019 and 2018, and the related consolidated statements of operations and comprehensive loss, stockholders’ equity and cash flows for each of the years in the two-year period ended December 31, 2019, have been audited by OUM & Co. LLP, independent registered public accounting firm, as stated in their report which is incorporated herein by reference. Such financial statements have been incorporated herein by reference in reliance on the report of such firm given upon their authority as experts in accounting and auditing.

We have filed with the SEC a registration statement on Form S-3 under the Securities Act, of which this prospectus forms a part. The rules and regulations of the SEC allow us to omit from this prospectus certain information included in the registration statement. For further information about us and the securities we are offering under this prospectus, you should refer to the registration statement and the exhibits and schedules filed with the registration statement. With respect to the statements contained in this prospectus regarding the contents of any agreement or any other document, in each instance, the statement is qualified in all respects by the complete text of the agreement or document, a copy of which has been filed as an exhibit to the registration statement or an item incorporated by reference in the registration statement.

We file annual, quarterly and current reports, proxy statements and other information with the SEC. Our SEC filings, including the registration statement and exhibits, are available to the public at the SEC’s website at http://www.sec.gov.

We maintain an Internet site at www.eksobionics.com. Our official Twitter account is @EksoBionics. We have not incorporated by reference into this prospectus the information on our website or Twitter account, and you should not consider any of the information posted on or hyper-linked to our website or Twitter account to be a part of this prospectus.

The SEC allows us to “incorporate by reference” the information we file with the SEC, which means we can disclose important information to you by referring you to those documents. The information we incorporate by reference is an important part of this prospectus, and certain information that we will later file with the SEC will automatically update and supersede this information. We incorporate by reference the documents listed below as well as any future filings made with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act after the date of this prospectus until we sell all of the securities under this prospectus, except that we do not incorporate any document or portion of a document that is “furnished” to the SEC, but not deemed “filed.” The following documents filed with the SEC are incorporated by reference in this prospectus:

We also incorporate by reference into this prospectus additional documents that we may file with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act, excluding, in each case, information deemed furnished and not filed until we sell all of the securities we are offering. Any statements contained in a previously filed document incorporated by reference into this prospectus is deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained in this prospectus, or in a subsequently filed document also incorporated by reference herein, modifies or supersedes that statement.

We will provide to you at no cost a copy of any and all of the information incorporated by reference into the registration statement of which this prospectus is a part. You may make a request for copies of this information in writing or by telephone. Requests should be directed to:

1,158,939 Shares of Common Stock Issuable
Upon the Exercise of Warrants to Purchase Common Stock

The following table sets forth an itemization of the various expenses, all of which we will pay, in connection with the issuance and distribution of the securities being registered. All of the amounts shown are estimated except the SEC Registration Fee.

Insofar as indemnification for liabilities arising under the Securities Act may be permitted to our directors, officers or controlling persons, we have been informed that in the opinion of the SEC, such indemnification is against public policy as expressed in the Securities Act and is, therefore, unenforceable.

(1) To file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:

provided, however, that paragraphs (a)(1)(i), (a)(1)(ii) and (a)(1)(iii) do not apply if the information required to be included in a post-effective amendment by those paragraphs is contained in reports filed with or furnished to the Commission by the registrant pursuant to section 13 or section 15(d) of the Securities Exchange Act of 1934 that are incorporated by reference in the registration statement, or is contained in a form of prospectus filed pursuant to Rule 424(b) that is part of the registration statement.

(2) That, for the purpose of determining any liability under the Securities Act of 1933, each such post-effective amendment shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(3) To remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering.

(4) That, for the purpose of determining liability under the Securities Act of 1933 to any purchaser:

(5) That, for the purpose of determining liability of the registrant under the Securities Act of 1933 to any purchaser in the initial distribution of the securities, in a primary offering of securities of the undersigned registrant pursuant to this registration statement, regardless of the underwriting method used to sell the securities to the purchaser, if the securities are offered or sold to such purchaser by means of any of the following communications, the undersigned registrant will be a seller to the purchaser and will be considered to offer or sell such securities to such purchaser:

(b) The undersigned registrant hereby undertakes that, for purposes of determining any liability under the Securities Act of 1933, each filing of the registrant’s annual report pursuant to section 13(a) or section 15(d) of the Securities Exchange Act of 1934 (and, where applicable, each filing of an employee benefit plan’s annual report pursuant to section 15(d) of the Securities Exchange Act of 1934) that is incorporated by reference in the registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

(c) Insofar as indemnification for liabilities arising under the Securities Act of 1933 may be permitted to directors, officers and controlling persons of the registrant, the registrant has been advised that in the opinion of the Securities and Exchange Commission such indemnification is against public policy as expressed in the Act and is, therefore, unenforceable. In the event that a claim for indemnification against such liabilities (other than the payment by the registrant of expenses incurred or paid by a director, officer or controlling person of the registrant in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person in connection with the securities being registered, the registrant will, unless in the opinion of its counsel the matter has been settled by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public policy as expressed in the Act and will be governed by the final adjudication of such issue.

(1) For purposes of determining any liability under the Securities Act of 1933, the information omitted from the form of prospectus filed as part of this registration statement in reliance upon Rule 430A and contained in a form of prospectus filed by the registrant pursuant to Rule 424(b)(1) or (4) or 497(h) under the Securities Act shall be deemed to be part of this registration statement as of the time it was declared effective.

(2) For the purpose of determining any liability under the Securities Act of 1933, each post-effective amendment that contains a form of prospectus shall be deemed to be a new registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to be the initial bona fide offering thereof.

Pursuant to the requirements of the Securities Act of 1933, the registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused this registration statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Richmond, California, on June 16, 2020.

We, the undersigned officers and directors of Ekso Bionics Holdings, Inc., hereby severally constitute and appoint Jack Peurach and John F. Glenn, and each of them singly (with full power to each of them to act alone), our true and lawful attorneys-in-fact and agents, with full power of substitution and resubstitution in each of them for her or him and in her or his name, place and stead, and in any and all capacities, to sign any and all amendments (including post-effective amendments) to this registration statement (or any other registration statement for the same offering that is to be effective upon filing pursuant to Rule 462(b) under the Securities Act of 1933), and to file the same, with all exhibits thereto and other documents in connection therewith, with the Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and authority to do and perform each and every act and thing requisite or necessary to be done in and about the premises, as full to all intents and purposes as she or he might or could do in person, hereby ratifying and confirming all that said attorneys-in-fact and agents or any of them or their or her or his substitute or substitutes may lawfully do or cause to be done by virtue hereof.

Pursuant to the requirements of the Securities Act of 1933, this registration statement has been signed below by the following persons in the capacities and on the dates indicated.

Nevada	99-0367049
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

Large accelerated filer ¨	Accelerated filer x	Non-accelerated filer ¨	Smaller reporting company x	Emerging growth company ¨
		(Do not check if a smaller reporting company)

	Page
ABOUT THIS PROSPECTUS	1
PROSPECTUS SUMMARY	2
RISK FACTORS	4
SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS	4
USE OF PROCEEDS	5
PLAN OF DISTRIBUTION	6
DESCRIPTION OF COMMON STOCK	9
DESCRIPTION OF PREFERRED STOCK	10
DESCRIPTION OF WARRANTS	12
DESCRIPTION OF DEBT SECURITIES	14
DESCRIPTION OF RIGHTS	25
DESCRIPTION OF UNITS	27
CERTAIN PROVISIONS OF NEVADA LAW AND OF THE COMPANY’S ARTICLES OF INCORPORATION AND BYLAWS	28
LEGAL MATTERS	31
EXPERTS	31
WHERE YOU CAN FIND MORE INFORMATION	31
INCORPORATION OF DOCUMENTS BY REFERENCE	32

	·	whether the debt securities are senior or subordinated;
	·	the offering price;
	·	the title;
	·	the principal amount being offered and any limit on the aggregate principal amount;
	·	the person who shall be entitled to receive interest, if other than the record holder on the record date;
	·	the maturity date and/or dates the principal will be payable;
	·	the interest rate or rates, which may be fixed or variable, if any, the date from which interest will accrue, the interest payment dates and the regular record dates, or the method for calculating the dates and rates;
	·	the place where payments may be made;

	·	any mandatory or optional redemption provisions or sinking fund provisions and any applicable redemption or purchase prices associated with these provisions;
	·	if issued other than in denominations of U.S. $1,000 or any multiple of U.S. $1,000, the denominations in which the debt securities shall be issuable;
	·	if applicable, the method for determining how the principal, premium, if any, or interest will be calculated by reference to an index or formula;
	·	if other than U.S. currency, the currency or currency units in which principal, premium, if any, or interest will be payable and whether we or a holder may elect payment to be made in a different currency;
	·	the portion of the principal amount that will be payable upon acceleration of maturity, if other than the entire principal amount;
	·	if the principal amount payable at stated maturity will not be determinable as of any date prior to stated maturity, the amount or method for determining the amount which will be deemed to be the principal amount;
	·	if applicable, whether the debt securities shall be subject to the defeasance provisions described below under “Satisfaction and discharge; defeasance” or such other defeasance provisions specified in the applicable prospectus supplement for the debt securities;
	·	any conversion or exchange provisions;
	·	whether the debt securities will be issuable in the form of a global security;
	·	any subordination provisions applicable to the subordinated debt securities if different from those described below under “Subordinated debt securities;”
	·	any paying agents, authenticating agents, security registrars or other agents for the debt securities, if other than the trustee;
	·	any provisions relating to any security provided for the debt securities, including any provisions regarding the circumstances under which collateral may be released or substituted;
	·	any deletions of, or changes or additions to, the events of default, acceleration provisions or covenants;
	·	any provisions relating to guaranties for the securities and any circumstances under which there may be additional obligors; and
	·	any other specific terms of such debt securities.

Title of Each Class of Securities to be Registered	Amount to be Registered			Proposed Maximum Offering Price per Unit			Proposed Maximum Aggregate Offering Price			Amount of Registration Fee (1)
Common Stock, $0.001 par value		(2	)		(3	)		(3	)		—
Preferred Stock, $0.001 par value		(2	)		(3	)		(3	)		—
Warrants		(2	)		(3	)		(3	)		—
Debt Securities		(2	)		(3	)		(3	)		—
Rights		(2	)		(3	)		(3	)		—
Units		(2	)		(3	)		(3	)		—
Total							$	75,000,000		$	6,443

(1)	Calculated pursuant to Rule 457(o) under the Securities Act of 1933, as amended (the “Securities Act”), based on the proposed maximum aggregate offering price. The Registrant previously paid registration fees of $7,995 pursuant to Registration Statement on Form S-3 (File No. 333-218517), originally filed with the Securities and Exchange Commission on June 6, 2017 (the “Prior Registration Statement”). Pursuant to Rule 415(a)(6) under the Securities Act (“Rule 415(a)(6)”), the securities registered pursuant to this Registration Statement include an aggregate of $10,913,080 of shares of common stock previously registered on the Prior Registration Statement and issuable upon exercise of outstanding warrants to purchase 1,158,939 shares of the Registrant’s common stock (the “Existing Warrant Shares”). Pursuant to Rule 415(a)(6), the registration fee of $1,163 associated with the offering of the Existing Warrant Shares is hereby applied to offset the registration fees associated with this Registration Statement. Excluding the issuance of the Existing Warrant Shares, another $19,972,359 of the Registrant’s securities registered pursuant to the Prior Registration Statement remain unsold, resulting in $2,129 in registration fees paid at the time of the filing of the Prior Registration Statement remaining unused. Pursuant to Rule 457(p) of the Securities Act, the Registrant also hereby applies these unused registration fees from the Prior Registration Statement to offset the registration fees associated with this Registration Statement. Additionally, As a result, net registration fees of $6,443 are payable in connection with the offering of new securities under this Registration Statement. Pursuant to Rule 415(a)(6), the offering of the Existing Warrant Shares under the Prior Registration Statement will be deemed terminated as of the date of effectiveness of this Registration Statement. For so long as the registrant’s public float remains below $75,000,000, the registrant will limit its issuance of securities in any twelve month calendar period to an aggregate market value (determined as of the time of issuance of that security) not in excess of one-third of the aggregate market value of all voting and non-voting common equity held by non-affiliates of the registrant in compliance with General Instruction I.B.6 of Form S-3.

(2)	There are being registered hereunder such indeterminate number of shares of common stock, preferred stock and debt securities, such indeterminate number of warrants and rights to purchase common stock, preferred stock or debt securities, and such indeterminate number of units, as shall have an aggregate initial offering price not to exceed $75,000,000. This $75,000,000 limit includes the aggregate of $10,913,080 that the registrant may sell pursuant to the exercise of the Existing Warrant Shares. Except for the Existing Warrant Shares, any other securities registered hereunder may be sold separately or as units with other securities registered hereunder. The proposed maximum initial offering price per unit will be determined, from time to time, by the registrant in connection with the issuance by the registrant of the securities registered hereunder. The securities registered also include such indeterminate number of shares of common stock and preferred stock as may be issued upon conversion of or exchange for preferred stock that provide for conversion or exchange, upon exercise of warrants or rights or pursuant to the anti-dilution provisions of any such securities. In addition, pursuant to Rule 416 under the Securities Act, the shares being registered hereunder include such indeterminate number of shares of common stock and preferred stock as may be issuable with respect to the shares being registered hereunder as a result of stock splits, stock dividends or similar transactions.

(3)	The proposed maximum aggregate offering price per class of security will be determined from time to time by the registrant in connection with the issuance by the registrant of the securities registered hereunder and is not specified as to each class of security pursuant to General Instruction II.D. of Form S-3 under the Securities Act.

	·	10 business days prior to the date the money would be turned over to the applicable state; or

	·	at the end of two years after such payment was due,

	·	the successor entity, if any, is a U.S. corporation, limited liability company, partnership, trust or other business entity;
	·	the successor entity assumes our obligations on the debt securities and under the indentures;

	·	immediately after giving effect to the transaction, no default or event of default shall have occurred and be continuing; and
	·	certain other conditions specified in the indenture are met.

	·	securing the securities;
	·	providing for a successor trustee or additional trustees;
	·	curing any ambiguities or inconsistencies;
	·	providing for guaranties of, or additional obligors on, the securities;
	·	permitting or facilitating the defeasance and discharge of the securities; and
	·	other changes specified in the indenture.

	·		change the stated maturity of any debt security;
	·		reduce the principal, premium, if any, or interest on any debt security or any amount payable upon redemption or repurchase, whether at our option or the option of any holder, or reduce the amount of any sinking fund payments;
	·		reduce the principal of an original issue discount security or any other debt security payable on acceleration of maturity;
	·		change the place of payment or the currency in which any debt security is payable;
	·		impair the right to enforce any payment after the stated maturity or redemption date;
	·		if subordinated debt securities, modify the subordination provisions in a materially adverse manner to the holders;
	·		adversely affect the right to convert any debt security if the debt security is a convertible debt security; or
	·		change the provisions in the indenture that relate to modifying or amending the indenture.

	·		a default in our obligations to pay principal, premium, if any, interest or other amounts on our senior debt occurs and the default continues beyond any applicable grace period, which we refer to as a payment default; or

	·		any other default occurs and is continuing with respect to designated senior debt that permits holders of designated senior debt to accelerate its maturity, which we refer to as a non-payment default, and the trustee receives a payment blockage notice from us or some other person permitted to give the notice under the subordinated indenture.

	·		in case of a payment default, when the default is cured or waived or ceases to exist, and

	·		in case of a nonpayment default, the earlier of when the default is cured or waived or ceases to exist or 179 days after the receipt of the payment blockage notice.

·		our indebtedness evidenced by a credit or loan agreement, note, bond, debenture or other written obligation;

·		all of our obligations for money borrowed;

·		all of our obligations evidenced by a note or similar instrument given in connection with the acquisition of any businesses, properties or assets of any kind,

·		our obligations:

	·		as lessee under leases required to be capitalized on the balance sheet of the lessee under generally accepted accounting principles, or

	·		as lessee under leases for facilities, capital equipment or related assets, whether or not capitalized, entered into or leased for financing purposes;

·		all of our obligations under interest rate and currency swaps, caps, floors, collars, hedge agreements, forward contracts or similar agreements or arrangements;

·		all of our obligations with respect to letters of credit, bankers’ acceptances and similar facilities, including reimbursement obligations with respect to the foregoing;

·		all of our obligations issued or assumed as the deferred purchase price of property or services, but excluding trade accounts payable and accrued liabilities arising in the ordinary course of business;

·		all obligations of the type referred to in the above clauses of another person, the payment of which, in either case, we have assumed or guaranteed, for which we are responsible or liable, directly or indirectly, jointly or severally, as obligor, guarantor or otherwise, or which are secured by a lien on our property; and

·		renewals, extensions, modifications, replacements, restatements and refundings of, or any indebtedness or obligation issued in exchange for, any such indebtedness or obligation described in the above clauses of this definition.

	·		any debt or obligation if its terms or the terms of the instrument under which or pursuant to which it is issued expressly provide that it shall not be senior in right of payment to the subordinated debt securities or expressly provide that such indebtedness is on the same basis or “junior” to the subordinated debt securities; or

	·		debt to any of our subsidiaries, a majority of the voting stock of which is owned, directly or indirectly, by us.

Prospectus Supplement		Page
About this Prospectus		S-1
Prospectus Supplement Summary		S-2
The Offering		S-3
Risk Factors		S-8
Cautionary Note Regarding Forward-looking Statements		S-11
Use of Proceeds		S-13
Dilution		S-14
Dividend Policy		S-16
Plan of Distribution		S-17
Legal Matters		S-18
Experts		S-18
Where You Can Find More Information		S-18
Incorporation of Certain Documents By Reference		S-19

2015 Warrants exercise price per share			$	41.25
Net tangible book value (deficit) per share of as March 31, 2020	$	0.86
Increase in net tangible book value per share attributable to exercise of 2015 Warrants	$	0.73
As adjusted, net tangible book value (deficit) per share as of March 31, 2020, after giving effect to exercise of 2015 Warrants			$	1.59
Dilution per share to new investors purchasing our common stock, after giving effect to exercise of 2015 Warrants			$	39.66

May 2019 Warrants exercise price per share			$	3.52
Net tangible book value (deficit) per share of as March 31, 2020	$	0.86
Increase in net tangible book value per share attributable to exercise of May 2019 Warrants	$	0.19
As adjusted, net tangible book value (deficit) per share as of March 31, 2020, after giving effect to exercise of May 2019 Warrants			$	1.05
Dilution per share to new investors purchasing our common stock, after giving effect to exercise of May 2019 Warrants			$	2.47

December 2019 Warrants exercise price per share			$	8.10
Net tangible book value (deficit) per share of as March 31, 2020	$	0.86
Increase in net tangible book value per share attributable to exercise of December 2019 Warrants	$	0.63
As adjusted, net tangible book value (deficit) per share as of March 31, 2020, after giving effect to exercise of December 2019 Warrants			$	1.49
Dilution per share to new investors purchasing our common stock, after giving effect to exercise of December 2019 Warrants			$	6.61

December 2019 Placement Agent Warrants exercise price per share			$	8.44
Net tangible book value (deficit) per share of as March 31, 2020	$	0.86
Increase in net tangible book value per share attributable to exercise of December 2019 Placement Agent Warrants	$	0.07
As adjusted, net tangible book value (deficit) per share as of March 31, 2020, after giving effect to exercise of December 2019 Placement Agent Warrants			$	0.93
Dilution per share to new investors purchasing our common stock, after giving effect to exercise of December 2019 Placement Agent Warrants			$	7.51

Weighted-average exercise price per share			$	9.42
Net tangible book value (deficit) per share of as March 31, 2020	$	0.86
Increase in net tangible book value per share attributable to exercise of all Registered Warrants	$	1.42
As adjusted, net tangible book value (deficit) per share as of March 31, 2020, after giving effect to exercise of all Registered Warrants			$	2.28
Dilution per share (on a weighted-average basis) to new investors purchasing our common stock, after giving effect to exercise of all Registered Warrants			$	7.14

SEC Registration Fee	$	6,443
Printing and Engraving Expenses		(1	)
Legal Fees and Expenses		(1	)
Accounting Fees and Expenses		(1	)
Transfer Agent and Registrar Fees		(1	)
Miscellaneous		(1	)
Total		(1	)

			Incorporated by Reference
Exhibit No.		Description	Form	Filing Date	Exhibit No.	Filed Herewith
1.1	*	Form of Underwriting Agreement
2.1		Agreement and Plan of Merger and Reorganization, dated as of January 15, 2014, by and among the Registrant, Acquisition Sub and Ekso Bionics, Inc.	8-K	1/23/2014	2.1
4.1		Articles of Incorporation of the Registrant	10-K	3/19/2015	3.1
4.2		Certificate of Amendment of Certificate of Incorporation of Ekso Bionics Holdings, Inc.	8-K	12/27/17	3.1
4.3		Certificate of Amendment to the Articles of Incorporation	8-K	3/24/19	3.1
4.4		By-Laws of the Registrant	8-K	1/23/2014	3.4
4.5		Certificate of Merger of Ekso Bionics, Inc., with and into Acquisition Sub, filed January 15, 2014.	8-K	1/23/2014	3.3
4.6		Form of specimen certificate	S-3	6/23/2015	4.4
4.7		Certificate of Change of Ekso Bionics Holdings, Inc. effective May 4, 2016	8-K	5/05/2016	3.1
4.8		Certificate of Amendment to Certificate of Designation of Series A Convertible Preferred Stock, filed on April 4, 2016	8-K	4/07/2016	3.1
4.9	*	Form of Certificate of Amendment or Designation with respect to Preferred Stock
4.10	*	Form of Warrant Agreement and Warrant Certificate
4.11		Form of 2015 Warrant	8-K	12/24/2015	4.1
4.12		Form of Amendment to 2015 Warrant	8-K	3/11/19	99.2
4.14		Form of May 2019 Warrant	8-K	5/24/19	4.1
4.15		Form of December 2019 Warrant	8-K	12/20/19	4.1
4.16		Form of December 2019 Placement Agent Warrant	8-K	12/20/19	4.2
4.17	*	Form of Unit Agreement and Unit
4.18		Registration Rights Agreement	8-K	7/25/2017	10.2
4.19	*	Form of Rights Agreement and Rights Certificate
4.20		Form of Senior Trust Indenture				X
4.21		Form of Subordinated Trust Indenture				X
4.22		Form of Senior Debt Security (included in Exhibit 4.20)				X

4.23		Form of Subordinated Debt Security (included in Exhibit 4.21)	X
5.1		Opinion of Snell & Wilmer L.L.P.	X
23.1		Consent of Independent Registered Public Accounting Firm	X
23.2		Consent of Snell & Wilmer L.L.P. (included in Exhibit 5.1)	X
24.1		Power of Attorney (contained here on the signature page)	X
25.1	*	Form T-1 Statement of Eligibility of Trustee for Senior Indenture under the Trust Indenture Act of 1939
25.2	*	Form T-1 Statement of Eligibility of Trustee for Subordinated Indenture under the Trust Indenture Act of 1939

	*	To be filed by amendment or as an exhibit to a report pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended, and incorporated herein by reference.

	EKSO BIONICS HOLDINGS, INC.

	By	/s/ Jack Peurach
		Jack Peurach
		Chief Executive Officer

Signatures		Title	Date

By:	/s/ Jack Peurach	President and Chief Executive Officer (principal	June 16, 2020
	Jack Peurach	executive officer) and Director

By:	/s/ John F. Glenn	Chief Financial Officer (principal	June 16, 2020
	John F. Glenn	financial officer and principal accounting officer)

By:	/s/ Steven Sherman	Director and Executive Chairman of the Board	June 16, 2020
	Steven Sherman

By:	/s/ Marilyn Hamilton	Director	June 16, 2020
	Marilyn Hamilton

By:	/s/ Charles Li, Ph.D.	Director	June 16, 2020
	Charles Li, Ph.D.

By:	/s/ Thomas A. Schreck	Director	June 16, 2020
	Thomas A. Schreck

By:	/s/ Stanley Stern	Director	June 16, 2020
	Stanley Stern

By:	/s/ Ted Wang, Ph.D.	Director	June 16, 2020
	Ted Wang, Ph.D.