cbli20200211

Pursuant to this prospectus supplement and the accompanying prospectus, we are offering to certain institutional and accredited investors 1,515,878 shares of our common stock at a purchase price of $2.0945 per share, for gross proceeds of approximately $3.175 million. In a concurrent private placement, we are selling to such investors warrants to purchase up to an aggregate of 757,939 shares of our common stock, which represent 50% of the number of shares of our common stock being purchased in this offering, or the Warrants. The Warrants will be exercisable immediately upon issuance at an exercise price of $2.033 per share and will expire five years from the issuance date. The offer, issuance, sale and resale of the Warrants and the shares of our common stock issuable upon the exercise of the Warrants are not being registered under the Securities Act of 1933, as amended, or the Securities Act, are not being offered pursuant to this prospectus supplement and the accompanying prospectus and are instead being offered pursuant to the exemption provided in Section 4(a)(2) under the Securities Act and Rule 506(b) promulgated thereunder. There is no established public trading market for the Warrants, and we do not expect a market to develop. In addition, we do not intend to list the Warrants on the Nasdaq Capital Market, any other national securities exchange or any other nationally recognized trading system.

Our common stock is listed on the Nasdaq Capital Market under the symbol “CBLI”. On May 29, 2020, the last reported sale price per share of our common stock was $2.05 per share.

As of June 1, 2020, the aggregate market value of our outstanding common stock held by non-affiliates was approximately $10.124 million, based on 4,867,282 shares of outstanding common stock held by non-affiliates as of such date and a price of $2.08 per share, which was the last reported sale price of our common stock on the Nasdaq Capital Market on May 27, 2020. We have not offered or sold any securities pursuant to General Instruction I.B.6 of Form S-3 during the 12 calendar months prior to and including the date of this prospectus supplement (but excluding this offering).

Investing in our securities involves a high degree of risk. See “Risk Factors” beginning on page S-4 of this prospectus supplement and in the documents incorporated by reference into this prospectus supplement.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus supplement or the accompanying prospectus. Any representation to the contrary is a criminal offense.

We have engaged H.C. Wainwright & Co., LLC, or the placement agent, as our exclusive placement agent in connection with this offering. The placement agent has no obligation to buy any of the securities from us or to arrange for the purchase or sale of any specific number or dollar amount of the securities. We have agreed to pay the placement agent the fees set forth in the table below. See “Plan of Distribution” beginning on page S-7 of this prospectus supplement for more information regarding these arrangements.

We expect that delivery of the shares of common stock being offered pursuant to this prospectus supplement and the accompanying prospectus will be made on or about June 3, 2020.

This prospectus supplement and the accompanying prospectus dated May 29, 2020, are part of a registration statement that we filed with the Securities and Exchange Commission, or the SEC, utilizing a “shelf” registration process. This prospectus supplement and the accompanying prospectus relate to the offer by us of shares of our common stock to certain investors. We provide information to you about this offering of shares of our common stock in two separate documents that are bound together: (1) this prospectus supplement, which describes the specific details regarding this offering; and (2) the accompanying 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 prospectus supplement is inconsistent with the accompanying 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 supplement or the accompanying 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. You should read this prospectus supplement, the accompanying prospectus, the documents and information incorporated by reference in this prospectus supplement and the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection with this offering when making your investment decision. You should also read and consider the information in the documents we have referred you to under the headings “Where You Can Find More Information; Information Incorporated by Reference.”

You should rely only on information contained in or incorporated by reference into this prospectus supplement and the accompanying prospectus. We have not, and the placement agent has not, authorized anyone to provide you with information that is different. We are offering to sell and seeking offers to buy shares of our common stock only in jurisdictions where offers and sales are permitted. The information contained in this prospectus supplement, the accompanying prospectus, the documents and information incorporated by reference in this prospectus supplement and the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection with this offering are accurate only as of their respective dates, regardless of the time of delivery of this prospectus supplement or of any sale of our common stock.

In this prospectus supplement, unless the context otherwise indicates, the terms “Cleveland BioLabs,” the “Company,” “we,” “our” and “us” or similar terms refer to Cleveland BioLabs, Inc., together with its consolidated subsidiaries.

We use our registered trademarks, Cleveland BioLabs and the Cleveland BioLabs, Inc. logo in this prospectus. All other trademarks, trade names and service marks appearing in this prospectus or the documents incorporated by reference herein are the property of their respective owners. Use or display by us of other parties’ trademarks, trade dress or products is not intended to and does not imply a relationship with, or endorsements or sponsorship of, us by the trademark or trade dress owner. Solely for convenience, trademarks and tradenames referred to in this prospectus appear without the ® and TM symbols, but those references are not intended to indicate, in any way, that we will not assert, to the fullest extent under applicable law, our rights or that the applicable owner will not assert its rights, to these trademarks and tradenames.

This prospectus supplement and the accompanying prospectus, including the documents incorporated by reference herein and therein, and any free writing prospectus that we have authorized for use in connection with this offering contain forward-looking statements that involve risks and uncertainties. Forward-looking statements give our current expectations of forecasts of future events.. All statements other than statements of historical facts contained in this prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein are forward-looking statements, including, without limitation, statements regarding our future financial position, business strategy, new products, budgets, liquidity, cash flows, projected costs, regulatory approvals or the impact of any laws or regulations applicable to us, and plans and objectives of management for future operations, are forward-looking statements within the meaning of Section 27A of the Securities Act and 21E of the Securities Exchange Act of 1934, as amended. The words “anticipate,” “believe,” “continue,” “should,” “estimate,” “expect,” “intend,” “may,” “plan,” “project,” “will,” and similar expressions, as they relate to us, are intended to identify forward-looking statements.

We have based these forward-looking statements on our current expectations about future events. While we believe these expectations are reasonable, such forward-looking statements are inherently subject to risks and uncertainties, many of which are beyond our control. Our actual future results may differ materially from those discussed here for various reasons. Factors that could contribute to such differences include, but are not limited to:

● the substantial doubt expressed by our independent auditors about our ability to continue as a going concern;

● our ability to successfully develop, obtain regulatory approval for, and commercialize our products in a timely manner;

● our ability to attract collaborators with development, regulatory and commercialization expertise;

● our plans and expectations with respect to future clinical trials and commercial scale-up activities;

● the size and growth potential of the markets for our product candidates, and our ability to serve those markets;

● regulatory requirements and developments in the United States, the European Union and foreign countries;

● our reliance on government funding for a significant portion of our operating costs and expenses;

● our current noncompliance with the continued listing requirements of the Nasdaq Capital Market;

● the geopolitical relationship between the United States and the Russian Federation, as well as general business, legal, financial and other conditions within the Russian Federation;

● our ability to obtain and maintain intellectual property protection for our product candidates; and

● the other factors discussed below and in the sections of the documents incorporated by reference herein under the headings “Risk Factors” and “Management's Discussion and Analysis of Financial Condition and Results of Operations” and in other filings we make with the Securities and Exchange Commission.

Given these risks and uncertainties, you are cautioned not to place undue reliance on such forward-looking statements. The forward-looking statements included in this prospectus are made only as of the date hereof. We do not undertake any obligation to update any such statements or to publicly announce the results of any revisions to any of such statements to reflect future events or developments.

Prospectus Supplement Summary

The items in the following summary are described in more detail later in this prospectus supplement and in the accompanying prospectus. This summary provides an overview of selected information and does not contain all the information you should consider before investing in our common stock. Therefore, you should read the entire prospectus supplement, the accompanying prospectus and any free writing prospectus that we have authorized for use in connection with this offering carefully, including the “Risk Factors” section, and other documents or information included or incorporated by reference in this prospectus supplement and the accompanying prospectus before making any investment decision.

Cleveland BioLabs, Inc.

Cleveland BioLabs is an innovative biopharmaceutical company developing novel approaches to activate the immune system and address serious medical needs. Our proprietary platform of Toll-like immune receptor activators has applications in mitigation of radiation injury and immuno-oncology. We combine our proven scientific expertise and our depth of knowledge about our products’ mechanisms of action into a passion for developing drugs to save lives.

Entolimod, a Toll-like receptor 5 (“TLR5”) agonist, which we are developing as a medical radiation countermeasure (“MRC”) for reducing the risk of death following exposure to potentially lethal irradiation from Acute Radiation Syndrome (“ARS”) is our most advanced product candidate. Other indications, including immunotherapy for oncology, have been or will be investigated as well. Entolimod as a MRC is being developed under the United States Food & Drug Administration’s (“FDA’s”) Animal Efficacy Rule for the indication of reducing the risk of death following exposure to potentially lethal irradiation occurring as a result of a radiation disaster. We believe that entolimod is the most efficacious MRC currently in development.

We have completed two Good Clinical Practices clinical studies designed to evaluate the safety, pharmacokinetics and pharmacodynamics of entolimod in a total of 150 healthy subjects. We have completed a Good Laboratory Practices (“GLP”), randomized, blinded, placebo-controlled, pivotal study designed to evaluate the dose-dependent effect of entolimod on survival and biomarker induction in 179 non-human primates exposed to 7.2 Gy total body irradiation when entolimod or a placebo was administered at 25 hours after radiation exposure. We have also completed a GLP, randomized, open-label, placebo-controlled, pivotal study designed to evaluate the dose-dependent effect of entolimod on biomarker induction in 160 non-irradiated non-human primates. In 2015, following confirmation from the FDA of the sufficiency of our existing efficacy and safety data and animal-to-human dose conversion, we submitted to the FDA an application for pre-Emergency Use Authorization (“pre-EUA”), a form of authorization granted by the FDA under certain circumstances. Since 2015, the FDA has indicated that a biocomparability exercise was necessary to compare the entolimod formulation used to perform early studies with the entolimod formulation planned for stock piling under the pre-EUA. This exercise is complete and the FDA agrees that for pre-EUA purposes, biocomparability has been demonstrated. This agreement is not yet in place for a future BLA. The FDA has also indicated that additional chemistry and manufacturing work must be performed for pre-EUA and BLA purposes. The FDA review the pre-clinical and clinical portions of the pre-EUA are ongoing.

If the FDA authorizes the pre-EUA application, then Federal agencies will be free to procure entolimod for stockpiling so that the drug is available to distribute in the event of an emergency, i.e., prior to the drug being formally approved by FDA under a Biologics License Application (“BLA”). Such authorization is not equivalent to full licensure through approval of a BLA, but precedes full licensure and, importantly, would position entolimod for potential sales in advance of full licensure in the U.S. We further believe pre-EUA status will position us to explore sales opportunities with foreign governments. We are awaiting the results of our pre-EUA application.

In September 2015, we announced two awards totaling approximately $15.8 million in funding from the United States Department of Defense, office of Congressionally Directed Medical Research Programs to support further development of entolimod as a MRC. These awards have funded, and will continue to fund until their expiration later this year, additional preclinical and clinical studies of entolimod, which are needed for a BLA. The contracts under which these awards were granted have since been amended, as previously disclosed.

In addition to development work on the MRC for reducing the risk of death from ARS indication, we have completed a Phase 1 open-label, dose-escalation trial of entolimod in 26 patients with advanced cancer in the U.S. The data for the U.S. study were presented at the 2015 annual meeting of the American Society of Clinical Oncology (“ASCO”). Seven (7) additional patients have been dosed with the entolimod drug formulation proposed for commercialization under the pre-EUA in an extension of this study performed in the Russian Federation (“Russia”).

In the third quarter of 2018, the Company created a joint venture called Genome Protection, Inc. (“GPI”) with Everon Biosciences, Inc. (“Everon”). GPI, which is currently 50% owned by the Company and 50% owned by Everon, is undertaking a research and development program aimed at clinical testing of entolimod and GP532 (a variant of our entolimod drug candidate) and the development of medications with anti-aging and other indications associated with genome damage. GPI is being initially funded by an investment from venture capital fund Norma Investments Limited (“Norma”). Under the terms of the arrangement with Norma, GPI granted Norma the right to purchase shares of GPI’s capital stock in the future in exchange for the payment of up to $30 million, of which $10.5 million was paid shortly after execution of the transaction documents.

Mobilan is a recombinant non-replicating adenovirus that directs expression of TLR5 and its agonistic ligand, a secretory non-glycosylated version of entolimod we are also developing through our subsidiary, Panacela Labs, Inc.. Two randomized, placebo-controlled, dose-ranging studies of Mobilan in men with prostate cancer are currently ongoing in the Russian Federation.

Corporation Information

We were incorporated in Delaware in June 2003 as a corporation spun off from The Cleveland Clinic. We exclusively license our founding intellectual property from The Cleveland Clinic. In 2007, we relocated our operations to Buffalo, New York and became affiliated with Roswell Park Cancer Institute, through technology licensing and research collaboration relationships. Our common stock is listed on the Nasdaq Capital Market under the symbol “CBLI.”

Our principal executive offices are located at 73 High Street, Buffalo, New York 14203, and our telephone number at that address is (716) 849-6810.

The Offering

Common stock offered by us

1,515,878 shares of common stock.

Offering price

$2.0945 per share

Common stock to be outstanding immediately after this offering

12,919,117

Use of proceeds

We intend to use the net proceeds from this offering for general corporate purposes. See “Use of Proceeds.”

Nasdaq Capital Market listing

Our common stock is listed on the Nasdaq Capital

Market under the symbol “CBLI.”

Risk factors

You should read the “Risk Factors” section of this prospectus supplement and in the documents incorporated by reference in this prospectus supplement for a discussion of factors to consider before deciding to invest in our common stock.

Concurrent private placement

In a concurrent private placement, we are selling to the purchasers of shares of our common stock in this offering warrants to purchase up to an aggregate of 757,939 shares of our common stock, which represents 50% of the number of shares of common stock purchased in this offering. We will receive gross proceeds from the concurrent private placement transaction solely to the extent such warrants are exercised for cash. The warrants will be exercisable immediately upon issuance at an exercise price of $2.033 per share and will expire five years from the issuance date. The warrants and the shares of our common stock issuable upon the exercise of the warrants are not being offered pursuant to this prospectus supplement and the accompanying prospectus and are instead being offered pursuant to the exemption provided in Section 4(a)(2) under the Securities Act and Rule 506(b) promulgated thereunder. See “Private Placement of Warrants” on page S-6.

The number of shares of common stock to be outstanding after this offering is based on 11,403,239 shares outstanding as of June 1, 2020, and excludes as of that date:

•

757,939 shares of common stock issuable upon exercise of warrants to be issued in the concurrent private placement with an exercise price of $2.033 per share, as described in “Private Placement of Warrants”;


	•	113,691 shares of common stock issuable upon exercise of warrants to be issued to the placement agent as compensation in connection with this offering with an exercise price of $2.6181 per share, as described in “Plan of Distribution”;

•

96,397 shares of common stock issuable upon exercise of outstanding options to purchase common stock; and

•

222,253 shares of common stock issuable upon exercise of outstanding warrants to purchase common stock.

Unless otherwise indicated, all information contained in this prospectus supplement assumes no exercise of the Warrants or the placement agent warrants to be issued to the placement agent as compensation in connection with this offering.

You should consider carefully the risks described below and discussed under the section captioned “Risk Factors” contained in our annual report on Form 10-K for the year ended December 31, 2019, as supplemented by our subsequent Quarterly Reports on Form 10-Q as filed under the Securities Exchange Act of 1934, as amended, or the Exchange Act, which are incorporated by reference in this prospectus supplement and the accompanying prospectus in their entirety, together with other information in this prospectus supplement, the accompanying prospectus and the information and documents incorporated by reference in this prospectus supplement and the accompanying prospectus, and any free writing prospectus that we have authorized for use in connection with this offering before you make a decision to invest in our common stock. If any of the following events actually occur, our business, operating results, prospects or financial condition could be materially and adversely affected. This could cause the trading price of our common stock to decline and you may lose all or part of your investment. The risks described below are not the only ones that we face. Additional risks not presently known to us or that we currently deem immaterial may also affect our business operations.

If you purchase shares of our common stock sold in this offering, you will experience immediate and substantial dilution in the net tangible book value of your shares. In addition, we may issue additional equity or convertible debt securities in the future, which may result in additional dilution to investors.

The offering price per share of common stock in this offering exceeds the net tangible book value per share of our outstanding common stock. As a result, investors purchasing shares of common stock in this offering may experience immediate and substantial dilution in the net tangible book value of the shares they purchase. For a more detailed discussion of the foregoing, see the section entitled “Dilution” below. To the extent outstanding stock options or warrants are exercised, there will be further dilution to new investors. In addition, to the extent we need to raise additional capital in the future and we issue additional equity or convertible debt securities, our then existing stockholders may experience dilution and the new securities may have rights senior to those of our common stock offered in this offering. Additionally, if we make one or more significant acquisitions in which the consideration includes stock or other securities, our stockholders’ holdings may be significantly diluted. Stockholders’ holdings may also be diluted if we enter into arrangements with third parties permitting us to issue shares of common stock in lieu of certain cash payments upon the achievement of milestones.

Our management team may invest or spend the proceeds of this offering in ways with which you may not agree or in ways which may not yield a significant return.

Our management will have broad discretion over the use of proceeds from this offering. We intend to use the net proceeds from this offering for general corporate purposes, including sales and marketing expenses associated with our product candidates, funding of our development programs, payment of milestones pursuant to our license agreements, general and administrative expenses, acquisition or licensing of additional product candidates or businesses and working capital. Our management will have considerable discretion in the application of the net proceeds, and you will not have the opportunity, as part of your investment decision, to assess whether the proceeds are being used appropriately. The net proceeds may be used for corporate purposes that do not increase our operating results or enhance the value of our common stock.

The price of our common stock has been and could remain volatile, which could cause your investment to lose value.

The market price of our common stock has historically experienced and may continue to experience significant volatility. The listing of our common stock on the Nasdaq Capital Market does not assure that a meaningful, consistent, and liquid trading market will exist, and in recent years, the market has experienced extreme price and volume fluctuations that have particularly affected the market prices of many smaller companies like us. Our common stock is thus subject to this volatility in addition to volatility caused by the occurrence of industry and company specific events. Factors that could cause fluctuations include, but are not limited to, the following:

In addition, the stock market in general, and the stock price of companies listed on the Nasdaq, and biotechnology companies in particular, have experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to the operating performance of these companies. Broad market and industry factors may negatively affect the market price of our common stock, regardless of actual operating performance. Accordingly, the value of an investment made in our common stock in this offering could lose value.

We estimate that the net proceeds to us from this offering will be approximately $2.78 million, after deducting placement agent fees and estimated offering expenses payable by us. We will not receive any proceeds from the concurrent private placement of the Warrants unless such warrants are exercised for cash.

We intend to use the net proceeds from this offering for general corporate purposes, including sales and marketing expenses associated with our product candidates, funding of our development programs, payment of milestones pursuant to our license agreements, general and administrative expenses, acquisition or licensing of additional product candidates or businesses and working capital. Pending these uses, we may invest the net proceeds in short-term, interest-bearing investment grade securities, certificates of deposit or direct or guaranteed obligations of the U.S. government. We have not determined the amount of net proceeds to be used specifically for such purposes. As a result, management will retain broad discretion over the allocation of net proceeds.

Concurrently with the closing of the sale of shares of common stock in this offering, we will also issue and sell to the investors the Warrants to purchase up to an aggregate of 757,939 shares of our common stock, at an initial exercise price equal to $2.033 per share.

Each Warrant shall be exercisable immediately upon issuance date and have a term of exercise equal to five years from the date of issuance. Subject to limited exceptions, a holder of 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% or 9.99% at the investor’s election, of the number of shares of our common stock outstanding immediately after giving effect to such exercise, provided that the holder may increase or decrease the beneficial ownership limitation up to 9.99%, provided, further, that any increase in the beneficial ownership limitation shall not be effective until 61 days following notice of such change to the Company.

There is no established public trading market for the Warrants and we do not expect a market to develop. In addition, we do not intend to list the Warrants on the Nasdaq Capital Market, any other national securities exchange or any other nationally recognized trading system.

The Warrants will be issued and sold without registration under the Securities Act, or state securities laws, in reliance on the exemptions provided by Section 4(a)(2) of the Act and/or Regulation D promulgated thereunder and in reliance on similar exemptions under applicable state laws. Accordingly, the investors may exercise those Warrants and sell the underlying shares only pursuant to an effective registration statement under the Securities Act covering the resale of those shares, an exemption under Rule 144 under the Securities Act, or another applicable exemption under the Securities Act.

If you invest in our common stock in this offering, your interest will be diluted to the extent of the difference between the offering price per share and the net tangible book value per share of our common stock after this offering, assuming no value is attributing to the Warrants issued in the concurrent private placement. As of March 31, 2020, our net tangible book value was $0.779 million, or $0.06835 per share, based on 11,403,239 shares of our common stock outstanding as of March 31, 2020. Our net tangible book value per share represents the amount of our total tangible assets reduced by the amount of our total liabilities, divided by the total number of shares of our common stock outstanding as of March 31, 2020. After giving effect to our sale in this offering of 1,515,878 shares of common stock at an offering price of $2.0945 per share, after deducting placement agent fees and estimated offering expenses payable by us, our as adjusted net tangible book value as of March 31, 2020 would have been $3.56 million, or $0.27569 per share. This represents an immediate increase of net tangible book value of $0.20734 per share to our existing stockholders and an immediate dilution of $1.8188 per share to new investors purchasing securities in this offering. The following table illustrates this per share dilution.

The above discussion and table are based on 11,403,239 shares outstanding as of March 31, 2020, and excludes as of that date:

To the extent that outstanding options or warrants are exercised, you 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 we raise additional capital by issuing equity or convertible debt securities, your ownership will be further diluted.

We engaged H.C. Wainwright & Co., LLC, or Wainwright, or the placement agent, to act as our exclusive placement agent to solicit offers to purchase the shares of our common stock offered by this prospectus supplement and the accompanying base prospectus. The placement agent is not purchasing or selling any such shares, nor is it required to arrange for the purchase and sale of any specific number or dollar amount of such shares, other than to use its “reasonable best efforts” to arrange for the sale of such shares by us. Therefore, we may not sell all of the shares of our common stock being offered. The terms of this offering were subject to market conditions and negotiations between us, the placement agent and prospective investors. The placement agent will have no authority to bind us by virtue of the engagement letter. We have entered into securities purchase agreements directly with certain institutional and accredited investors who have agreed to purchase shares of our common stock in this offering. We will only sell to investors who have entered into securities purchase agreements.

Delivery of the shares of common stock offered hereby is expected to take place on or about June 3, 2020, subject to satisfaction of certain closing conditions.

We have agreed to pay the placement agent: (i) a cash fee equal to 7.25% of the aggregate gross proceeds of this offering, (ii) a management fee equal to 1.0% of the gross proceeds raised in this offering, (iii) a non-accountable expense allowance of $75,000, and (iv) $12,900 for clearing fees.

We estimate the total expenses of this offering paid or payable by us will be approximately $392,338. After deducting the fees due to the placement agent and our expenses in connection with this offering, we expect the net proceeds from this offering will be approximately $2.78 million.

In addition, we have agreed to issue to the placement agent (or its designees), at the closing of this offering, warrants to purchase 7.5% of the number of shares of our common stock sold in this offering (or warrants to purchase up to 113,691 shares of our common stock). Such warrants will have substantially the same terms as the warrants being sold and issued in the private placement, except that the placement agent’s warrants will have an exercise price equal to 125% of the offering price per share (or $2.6181 per share) and have a term of exercise of five years from the effective date of this offering. None of the offer, sale, issuance or resale of the placement agent’s warrants nor the shares of our common stock issuable upon exercise thereof are being registered hereby. Pursuant to Rule 5110(g) of the Financial Industry Regulatory Authority, or FINRA, the placement agent’s warrants and any shares issued upon exercise thereof will not be sold, transferred, assigned, pledged or hypothecated, or be the subject of any hedging, short sale, derivative, put or call transaction that would result in the effective economic disposition of the securities by any person, for a period of 180 days immediately following the date of effectiveness or commencement of sales in this offering, except: (i) the transfer of any security by operation of law or by reason of our reorganization; (ii) the transfer of any security to any FINRA member firm participating in the offering and the officers or partners thereof, if all securities so transferred remain subject to the lock-up restriction set forth above for the remainder of the time period; (iii) the transfer of any security if the aggregate amount of our securities held by the placement agent or related persons do not exceed 1% of the securities being offered; (iv) the transfer of any security that is beneficially owned on a pro-rata basis by all equity owners of an investment fund, provided that no participating member manages or otherwise directs investments by the fund and the participating members in the aggregate do not own more than 10% of the equity in the fund; or (v) the exercise or conversion of any security, if all securities remain subject to the lock-up restriction set forth above for the remainder of the time period.

We have agreed to indemnify the placement agent against certain liabilities, including liabilities under the Securities Act and liabilities arising from breaches of representations and warranties contained in our engagement letter with the placement agent. We have also agreed to contribute to payments the placement agent may be required to make in respect of such liabilities.

In addition, we will indemnify the purchaser of shares of our common stock in this offering against liabilities arising out of or relating to (i) any breach of any of the representations, warranties, covenants or agreements made by us in the securities purchase agreement or related documents or (ii) any action instituted against a purchaser by a third party (other than a third party who is affiliated with such purchaser) with respect to the securities purchase agreement or related documents and the transactions contemplated thereby, subject to certain exceptions.

We have also granted Wainwright, subject to certain exceptions, a right of first refusal for a period of twelve (12) months following the closing of this offering to act as sole book-running manager, sole underwriter or sole placement agent for each and every future debt financing or refinancing and public or private equity offering by us or any of our subsidiaries.

From time to time, Wainwright may provide in the future various advisory, investment and commercial banking and other services to us in the ordinary course of business, for which they have received and may continue to receive customary fees and commissions. However, except as disclosed in this prospectus supplement, we have no present arrangements with Wainwright for any further services.

The placement agent may be deemed to be an underwriter within the meaning of Section 2(a)(11) of the Securities Act, and any commissions received by it and any profit realized on the sale of our shares of common stock offered hereby by it while acting as principal might be deemed to be underwriting discounts or commissions under the Securities Act. The placement agent will be required to comply with the requirements of the Securities Act and the Exchange Act, including, without limitation, Rule 10b-5 and Regulation M under the Exchange Act. These rules and regulations may limit the timing of purchases and sales of our securities by the placement agent. Under these rules and regulations, the placement agent may not (i) engage in any stabilization activity in connection with our securities; and (ii) bid for or purchase any of our securities or attempt to induce any person to purchase any of our securities, other than as permitted under the Exchange Act, until they have completed their participation in the distribution.

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

The validity of the issuance of the securities offered hereby will be passed upon by our counsel, McGuireWoods LLP, New York, New York.

The consolidated financial statements of Cleveland BioLabs, Inc. appearing in Cleveland BioLabs, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2019 have been audited by Meaden & Moore, an independent registered public accounting firm, as set forth in its report thereon, included therein and incorporated herein by reference. Such financial statements are, and audited financial statements to be included in subsequently filed documents will be, incorporated herein in reliance upon the report of Meaden & Moore pertaining to such financial statements as of the date (to the extent covered by consents filed with the SEC) given on the authority of such firm 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 supplement forms a part. The rules and regulations of the SEC allow us to omit from this prospectus supplement and the accompanying prospectus certain information included in the registration statement. For further information about us and the securities we are offering under this prospectus supplement, 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 supplement and the accompanying 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.

We file reports, proxy statements and other information with the SEC. The SEC maintains a website that contains reports, proxy and information statements and other information about issuers, such as us, who file electronically with the SEC. The address of that website is http://www.sec.gov.

Our website address is www.cbiolabs.com. The information on, or accessible through, our website is not part of, and is not incorporated into, this prospectus supplement or the accompanying prospectus and should not be considered part of this prospectus supplement or the accompanying prospectus.

The SEC’s rules allow us to “incorporate by reference” information into this prospectus supplement, which means that we can disclose important information to you by referring you to another document filed separately with the SEC. The information incorporated by reference is deemed to be part of this prospectus supplement and the accompanying prospectus, and subsequent information that we file with the SEC will automatically update and supersede that information. Any statement contained in a previously filed document incorporated by reference will be deemed to be modified or superseded for purposes of this prospectus supplement and accompanying prospectus to the extent that a statement contained in this prospectus supplement or the accompanying prospectus modifies or replaces that statement.

We incorporate by reference our documents listed below and any future filings made by us with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Securities Exchange Act of 1934, as amended, which we refer to as the “Exchange Act” in this prospectus supplement, between the date of this prospectus supplement and the termination of the offering of the securities described in this prospectus supplement. We are not, however, incorporating by reference any documents or portions thereof, whether specifically listed below or filed in the future, that are not deemed “filed” with the SEC, including any information furnished pursuant to Items 2.02 or 7.01 of Form 8-K or related exhibits furnished pursuant to Item 9.01 of Form 8-K.

This prospectus supplement and the accompanying prospectus incorporate by reference the documents set forth below that have previously been filed with the SEC:

All reports and other documents we subsequently file pursuant to Section 13(a), 13(c), 14 or 15(d) of the Exchange Act prior to the termination of this offering, including, but excluding any information furnished to, rather than filed with, the SEC, will also be incorporated by reference into this prospectus supplement and the accompanying prospectus and deemed to be part of this prospectus supplement and the accompanying prospectus from the date of the filing of such reports and documents.

We will furnish without charge to you a copy of any or all of the documents incorporated by reference, including exhibits to these documents, upon written or oral request. Direct your written request to: Vice President of Finance, Cleveland BioLabs, Inc., 73 High Street, Buffalo, New York 14203, or (716) 849-6810.

We may issue from time to time in one or more series or classes up to $50,000,000 in aggregate total amount of our common stock, preferred stock, warrants and/or units. This prospectus describes the general terms of our common stock, preferred stock, warrants and/or units and the general manner in which such securities will be offered. We will describe the specific manner in which these securities will be offered in supplements to this prospectus, which may also supplement, update or amend information contained in this prospectus. You should read this prospectus, any applicable prospectus supplement, any free writing prospectus and any term sheet or other offering materials carefully before you invest in our securities.

We may offer our securities in amounts, at prices and on terms determined at the time of offering. The securities may be sold directly to you, through agents, or through underwriters and dealers. If agents, underwriters or dealers are used to sell the shares, we will name them and describe their compensation in a prospectus supplement.

Our common stock is listed on The Nasdaq Capital Market under the symbol “CBLI.” On May 20, 2020, the last reported sale price of our common stock on The Nasdaq Capital Market was $2.18 per share. As of May 20, 2020, the aggregate market value of our outstanding common stock held by non-affiliates was approximately $10,610,675, based on 11,403,239 shares of outstanding common stock, of which approximately 4,867,282 shares were held by non-affiliates, and a per share price of $2.18 based on the closing sale price of our common stock on May 20, 2020.

Investing in our securities involves risks. See “Risk Factors” beginning on page 4 of this prospectus and any other risk factors included in any accompanying prospectus supplement and in the documents incorporated by reference in this prospectus or any prospectus supplement for a discussion of the factors you should carefully consider before deciding to purchase our securities.

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

This prospectus is part of a registration statement that we filed with the Securities and Exchange Commission, or the SEC, using a “shelf” registration process. Under this shelf process, we may from time to time offer to sell up to $50,000,000 in aggregate total amount of our shares of common stock, preferred stock, warrants to purchase any such securities and/or units in one or more offerings.

This prospectus provides you with a general description of the securities we may offer. Each time we offer a type or series of such securities, we will provide a prospectus supplement that will contain specific information about the terms of that offering. The prospectus supplement, or information incorporated by reference in this prospectus or any prospectus supplement that is of a more recent date, may also add, update or change information contained in this prospectus. To the extent that any statement that we make in a prospectus supplement is inconsistent with statements made in this prospectus, the statements made in this prospectus will be deemed modified or superseded by those made in the prospectus supplement. You should read both this prospectus and any prospectus supplement together with the additional information described below under the heading “Where You Can Find More Information.” This prospectus may not be used to consummate a sale of our securities unless it is accompanied by a prospectus supplement. We may also authorize one or more free writing prospectuses to be provided to you that may contain material information relating to these offerings.

You should rely only on the information contained in or incorporated by reference in this prospectus, any accompanying prospectus supplement or in any related free writing prospectus filed by us with the SEC. We have not authorized anyone to provide you with different information. This prospectus and any accompanying prospectus supplement do not constitute an offer to sell or the solicitation of an offer to buy our securities other than our securities described in such accompanying prospectus supplement or an offer to sell or the solicitation of an offer to buy our securities in any circumstances in which such offer or solicitation is unlawful. You should assume that the information appearing in this prospectus, any prospectus supplement, the documents incorporated by reference and any related free writing prospectus is accurate only as of their respective dates. Our business, financial condition, results of operations and prospects may have changed materially since those dates. Any information in subsequent filings incorporated by reference in this prospectus or any accompanying prospectus supplement that is inconsistent with this prospectus or any accompanying prospectus supplement will supersede the information in this prospectus or any accompanying prospectus supplement.

The Cleveland BioLabs, Inc. logo and its product names are proprietary trade names of Cleveland BioLabs, Inc. and its subsidiaries. All other brand names or trademarks appearing in this prospectus are the property of their respective holders. Unless the context requires otherwise, references in this prospectus to “Cleveland BioLabs,” the “Company,” “we,” “us,” and “our” refer to Cleveland BioLabs, Inc., together with its consolidated subsidiaries.

In this prospectus, we refer to the common stock, preferred stock, warrants and units being offered, collectively, as “securities.”

This prospectus and any accompanying prospectus supplement contain forward-looking statements that involve risks and uncertainties. Forward-looking statements give our current expectations of forecasts of future events. All statements other than statements of current or historical fact contained in this prospectus and any accompanying prospectus supplement, including statements regarding our future financial position, business strategy, new products, budgets, liquidity, cash flows, projected costs, regulatory approvals or the impact of any laws or regulations applicable to us, and plans and objectives of management for future operations, are forward-looking statements within the meaning of Section 27A of the Securities Act and 21E of the Securities Exchange Act of 1934, as amended. The words “anticipate,” “believe,” “continue,” “should,” “estimate,” “expect,” “intend,” “may,” “plan,” “project,” “will,” and similar expressions, as they relate to us, are intended to identify forward-looking statements.

Entolimod, a Toll-like receptor 5 (“TLR5”) agonist, which we are developing as a medical radiation countermeasure (“MRC”) for reducing the risk of death following exposure to potentially lethal irradiation from Acute Radiation Syndrome (“ARS”) is our most advanced product candidate. Other indications, including immunotherapy for oncology, have been or are being investigated as well. Entolimod as a MRC is being developed under the United States Food & Drug Administration’s (“FDA’s”) Animal Efficacy Rule for the indication of reducing the risk of death following exposure to potentially lethal irradiation occurring as a result of a radiation disaster. We believe that entolimod is the most efficacious MRC currently in development.

We have completed two Good Clinical Practices (“GCP”) clinical studies designed to evaluate the safety, pharmacokinetics and pharmacodynamics of entolimod in a total of 150 healthy subjects. We have completed a Good Laboratory Practices (“GLP”), randomized, blinded, placebo-controlled, pivotal study designed to evaluate the dose-dependent effect of entolimod on survival and biomarker induction in 179 non-human primates exposed to 7.2 Gy total body irradiation when entolimod or a placebo was administered at 25 hours after radiation exposure. We have also completed a GLP, randomized, open-label, placebo-controlled, pivotal study designed to evaluate the dose-dependent effect of entolimod on biomarker induction in 160 non-irradiated non-human primates. In 2015, following confirmation from the FDA of the sufficiency of our existing efficacy and safety data and animal-to-human dose conversion, we submitted to the FDA an application for pre-Emergency Use Authorization (“pre-EUA”), a form of authorization granted by the FDA under certain circumstances.

If the FDA approves the pre-EUA application, then Federal agencies will be free to procure entolimod for stockpiling so that the drug is available to distribute in the event of an emergency, i.e., prior to the drug being formally approved by FDA under a Biologics License Application (“BLA”). Such authorization is not equivalent to full licensure through approval of a BLA, but precedes full licensure and, importantly, would position entolimod for potential sales in advance of full licensure in the U.S. We further believe pre-EUA status will position us to explore sales opportunities with foreign governments. We are awaiting the results of our pre-EUA application.

In September 2015, we announced two awards totaling approximately $15.8 million in funding from the United States Department of Defense (“DoD”), office of Congressionally Directed Medical Research Programs to support further development of entolimod as a MRC. These awards have funded, and will continue to fund, additional preclinical and clinical studies of entolimod, which are needed for a BLA. The contracts under which these awards were granted have since been amended, as previously disclosed.

Mobilan is a recombinant non-replicating adenovirus that directs expression of TLR5 and its agonistic ligand, a secretory non-glycosylated version of entolimod we are also developing through our subsidiary, Panacela Labs, Inc.. Two randomized, placebo-controlled, dose-ranging studies of Mobilan in men with prostate cancer are currently ongoing in the Russian Federation.

Our principal executive offices are located at 73 High Street, Buffalo, New York 14203, and our telephone number at that address is (716) 849-6810.

Investing in our securities involves significant risks. Please see the risk factors under the heading “Risk Factors” in our most recently filed Annual Report on Form 10-K, as amended, or as revised or supplemented by our Quarterly Reports on Form 10-Q filed with the SEC since the filing of our most recent Annual Report on Form 10-K, all of which are incorporated by reference in this prospectus. Before making an investment decision, you should carefully consider these risks as well as other information we include or incorporate by reference in this prospectus and any prospectus supplement. The risks and uncertainties we have described are not the only ones facing our company. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also affect our business operations.

Unless otherwise indicated in any applicable prospectus supplement, we intend to use the net proceeds from the sale of any securities offered under this prospectus for general corporate purposes, including repayment, repurchase or refinance of debt obligations, sales and marketing expenses associated with our product candidates, funding of our development programs, payment of milestones pursuant to our license agreements, general and administrative expenses, acquisition or licensing of additional product candidates or businesses and working capital. Pending these uses, we may invest the net proceeds in short-term, interest-bearing investment grade securities, certificates of deposit or direct or guaranteed obligations of the U.S. government. We have not determined the amount of net proceeds to be used specifically for such purposes. As a result, management will retain broad discretion over the allocation of net proceeds.

If there is a material dilution of the purchasers’ equity interest from the sale of our securities offered under this prospectus, we will set forth in any prospectus supplement the following information regarding any such material dilution of the equity interests of purchasers purchasing our securities in an offering under this prospectus:

The descriptions of the securities contained in this prospectus, together with the applicable prospectus supplements, summarize all the material terms and provisions of the various types of securities that we may offer under this prospectus. The terms of the offering of securities, the initial offering price and the net proceeds to us will be contained in the prospectus supplement, and other offering material, relating to such offer. We will also include in the prospectus supplement information, where applicable, about material United States federal income tax considerations relating to the securities and the securities exchange, if any, on which the securities will be listed.

Our restated certificate of incorporation, as amended, authorizes us to issue up to 25,000,000 shares of common stock, par value $0.005 per share, and 1,000,000 shares of preferred stock, par value $0.005 per share. As of May 14, 2020, we had outstanding

As of May 14, 2020, we had approximately 29 holders of record in our common stock. The actual number of stockholders is greater than this number of record holders, and includes stockholders who are beneficial owners, but whose shares are held in street name by banks, brokers and other nominees. This number of holders of record also does not include stockholders whose shares may be held in trust by other entities.

The following description of our capital stock is not complete and is subject to and qualified in its entirety by our restated certificate of incorporation, as amended, and by the relevant provisions of the Delaware General Corporation Law.

Voting Rights. The holders of our common stock are entitled to one vote per share with respect to each matter presented to our stockholders on which the holders of common stock are entitled to vote. The holders of our common stock do not have cumulative voting rights. An election of directors by our stockholders is determined by a plurality of the votes cast by the stockholders entitled to vote on the election.

Dividends. Holders of common stock are entitled to receive ratably any dividends as may be declared by our board of directors, subject to any preferential dividend rights of outstanding preferred stock.

Liquidation and Dissolution. In the event of our liquidation or dissolution, the holders of common stock are entitled to receive ratably all assets available for distribution to stockholders after the payment of all debts and other liabilities and subject to the prior rights of any outstanding preferred stock.

Other Rights. Holders of common stock have no preemptive, subscription, redemption or conversion rights. The rights, preferences and privileges of holders of common stock are subject to and may be adversely affected by the rights of the holders of shares of any series of preferred stock that we may designate and issue in the future. There are no sinking fund provisions applicable to our common stock. There are no restrictions on the alienability of our common stock and there are no provisions discriminating against any existing or prospective holder of our common stock as a result of such holder owning a substantial amount of our securities.

Listing. Our common stock is listed on The NASDAQ Capital Market under the symbol “CBLI.”

Transfer Agent and Registrar. The transfer agent and registrar for our common stock is Continental Stock Transfer & Trust Company.

Fully Paid and Nonassessable. All of our outstanding shares of common stock are, and the shares of common stock to be issued in this offering will be, fully paid and nonassessable.

Our Board of Directors has the authority, without further action by the stockholders, to issue up to 1,000,000 shares of preferred stock in one or more series, to establish from time to time the number of shares to be included in each such series, to fix the rights, preferences and privileges of the shares of each wholly unissued series and any qualifications, limitations or restrictions thereon and to increase or decrease the number of shares of any such series, but not below the number of shares of such series then outstanding.

Our board of directors may authorize the issuance of preferred stock with voting or conversion rights that could adversely affect the voting power or other rights of the holders of the common stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring or preventing a change in our control that may otherwise benefit holders of our common stock and may adversely affect the market price of the common stock and the voting and other rights of the holders of common stock.

On February 5, 2015, the Company filed a Certificate of Designations of Preferences, Rights and Limitations of Series A Convertible Preferred Stock (the “Series A Certificate of Designation”) with the Secretary of State of the State of Delaware. The number of shares of preferred stock designated as Series A Preferred Stock is 718 and each share of Series A Preferred Stock has a stated value equal to $1,000. As of the date of this prospectus, there are no shares of Series A Convertible Preferred Stock outstanding.

Voting Rights. Except as otherwise provided in the Series A Certificate of Designation or as otherwise required by law, the Series A Preferred Stock shall have no voting rights. However, as long as any shares of Series A Preferred Stock are outstanding, the Company shall not, without the affirmative vote of the holders of a majority of the then outstanding shares of the Series A Preferred Stock, (a) alter or change adversely the powers, preferences or rights given to the Series A Preferred Stock or alter or amend the Series A Certificate of Designation, (b) authorize or create any class of stock ranking as to dividends, redemption or distribution of assets upon a liquidation senior to, or pari passu with, the Series A Preferred Stock, (c) amend its certificate of incorporation or other charter documents in any manner that adversely affects any rights of the holders of the Series A Preferred Stock, (d) increase the number of authorized shares of Series A Preferred Stock, or (e) enter into any agreement with respect to any of the foregoing.

Liquidation. Upon any liquidation, dissolution or winding-up of the Company, whether voluntary or involuntary (a “Liquidation”), the holders of Series A Preferred Stock shall be entitled to receive out of the assets, whether capital or surplus, of the Company an amount equal to the Stated Value, plus any other fees, liquidated damages or dividends then due and owing thereon under the Series A Certificate of Designation, for each share of Series A Preferred Stock before any distribution or payment shall be made to the holders of any securities junior to the Series A Preferred Stock, and if the assets of the Company shall be insufficient to pay in full such amounts, then the entire assets to be distributed to the holders of Series A Preferred Stock shall be ratably distributed among the holders in accordance with the respective amounts that would be payable on such shares if all amounts payable thereon were paid in full. A “Fundamental Transaction” or “Change of Control Transaction” (each as defined in the Series A Certificate of Designation) shall not be deemed a Liquidation. The Company shall mail written notice of any such Liquidation, not less than 45 days prior to the payment date stated therein, to each holder.

Conversion Price. The conversion price for the Series A Preferred Stock shall equal $3.00, subject to certain terms as described therein.

As of May 14, 2020, there were 96,397 shares of our common stock issuable upon the exercise of outstanding stock options, at a weighted average exercise price of $34.83 per share.

Anti-Takeover Effects of Delaware Law and our Certificate of Incorporation and By-laws

The provisions of Delaware law, our certificate of incorporation and our bylaws, which are discussed below, could discourage or make it more difficult to accomplish a proxy contest or other change in our management or the acquisition of control by a holder of a substantial amount of our voting stock. It is possible that these provisions could make it more difficult to accomplish, or could deter, transactions that stockholders may otherwise consider to be in their best interests or the best interests of the company. These provisions are intended to enhance the likelihood of continuity and stability in the composition of our board of directors and in the policies formulated by the board of directors and to discourage certain types of transactions that may involve an actual or threatened change of control of us. These provisions are also designed to reduce our vulnerability to an unsolicited acquisition proposal and to discourage certain tactics that may be used in proxy fights. Such provisions also may have the effect of preventing changes in our management.

Since April 2016, we have not been subject to the anti-takeover provisions of Section 203 of the Delaware General Corporation Law, or DGCL. In general, Section 203 prohibits a publicly-held Delaware corporation from engaging in a “business combination” with an “interested stockholder” for a period of three years after the date of the transaction in which the person became an interested stockholder, unless the business combination is, or the transaction in which the person became an interested stockholder was, approved in a prescribed manner or another prescribed exception applies. For purposes of Section 203, a “business combination” is defined broadly to include a merger, asset sale or other transaction resulting in a financial benefit to the interested stockholder, and, subject to certain exceptions, an “interested stockholder” is a person who, together with his or her affiliates and associates, owns, or within three years prior, did own, 15% or more of the corporation’s voting stock.

Stockholder Action; Special Meeting of Stockholders; Advance Notice Requirements for Stockholder Proposals and Director Nominations

Our certificate of incorporation and bylaws do not permit our stockholders to act by written consent. As a result, any action to be effected by our stockholders must be effected at a duly called annual or special meeting of the stockholders. Our certificate of incorporation and our bylaws also provide that special meetings of the stockholders may be called only by (i) our Chairman of the board of directors, (ii) our board of directors or any holder or holders of 10% or more of the outstanding voting power of the issued and outstanding shares of capital stock of the company entitled to vote in connection with the election of directors.

Our bylaws provide that, for nominations to the board of directors or for other business to be properly brought by a stockholder before a meeting of stockholders, the stockholder must first have given timely notice of the proposal in writing to our Secretary. For an annual meeting, a stockholder’s notice generally must be delivered not less than 90 days nor more than 120 days prior to the anniversary of the date of the previous year’s annual meeting; provided, however, that in the event that the annual meeting is called for a date that is not within 30 days before or after such anniversary date, notice by the stockholder in order to be timely must be received not later than the 10th day following the day on which such notice of the date of the annual meeting was mailed or public disclosure was made, whichever occurs first. Detailed requirements as to the form of the notice and information required in the notice are specified in the bylaws. If it is determined that business was not properly brought before a meeting in accordance with our bylaws, such business will not be considered at the meeting.

On July 9, 2015, we closed a private placement transaction with David Davidovich, a venture capital investor, pursuant to which the Company issued and sold to Mr. Davidovich an aggregate of 6,459,948 shares of the Company’s common stock under the terms of the Securities Purchase Agreement between the Company and Mr. Davidovich, dated June 24, 2015 (the “Davidovich Purchase Agreement”). Under the Davidovich Purchase Agreement, Mr. Davidovich has the right to nominate for election to the Board a majority of directors until such time as he no longer holds a majority of the issued and outstanding common stock of the Company. As of the date of this prospectus, Mr. Davidovich retains 56.90% of our outstanding shares of common stock, and therefore continues to have the right to nominate for election to our board of directors a majority of our directors.

We have 13,278,111 shares of common stock, including shares of common stock reserved for issuance under the Company’s 2013 Employee Stock Purchase Plan and the Cleveland BioLabs, Inc. Equity Incentive Plan, and 1,000,000 shares preferred stock available for future issuance without stockholder approval, subject to any limitations imposed by the listing standards of The NASDAQ Capital Market. We may utilize these additional shares for a variety of corporate purposes including for future public offerings to raise additional capital or facilitate corporate acquisitions or for payment as a dividend on our capital stock. The existence of unissued and unreserved common stock and preferred stock may enable our board of directors to issue shares to persons friendly to current management or to issue preferred stock with terms that could have the effect of making it more difficult for a third party to acquire, or could discourage a third party from seeking to acquire, a controlling interest in our company by means of a merger, tender offer, proxy contest or otherwise. In addition, if we issue preferred stock, the issuance could adversely affect the voting power of holders of common stock and the likelihood that such holders will receive dividend payments and payments upon liquidation.

Our certificate of incorporation contains provisions permitted under the DGCL relating to the liability of directors. The provisions eliminate a director’s liability for monetary damages for a breach of fiduciary duty, except in circumstances involving wrongful acts, such as the breach of a director’s duty of loyalty or acts or omissions not in good faith or that involve intentional misconduct or a knowing violation of law. Further, our certificate of incorporation contains provisions to indemnify our directors and officers to the fullest extent permitted by the DGCL. We have also entered into indemnification agreements with certain of our current and former directors and certain of our officers and expect to enter into a similar agreement with any new directors or officers.

We may issue warrants to purchase common stock or preferred stock. We may offer warrants separately or together with one or more additional warrants, common stock or preferred stock, or any combination of those securities in the form of units, as described in the applicable prospectus supplement. If we issue warrants as part of a unit, the accompanying prospectus supplement will specify whether those warrants may be separated from the other securities in the unit prior to the expiration date of the warrants. The applicable prospectus supplement will also describe the following terms of any warrants:

We may issue units comprised of one or more of the other securities that may be offered under this prospectus, in any combination. The following, together with the additional information we may include in the applicable prospectus supplement, summarizes the material terms and provisions of the units that we may offer under this prospectus. While the terms summarized below will apply generally to any units we may offer, we will describe the particular terms of any series of units in more detail in the applicable prospectus supplement.

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 included security. 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.

We may sell our securities from time to time pursuant to underwritten public offerings, negotiated transactions, block trades or a combination of these methods. We may sell our securities separately or together:

The related prospectus supplement will set forth the terms of each offering, including:

We may solicit directly offers to purchase securities being offered by this prospectus. We may also designate agents to solicit offers to purchase our securities from time to time. We may sell our securities offered by this prospectus by any method permitted by law, including sales deemed to be an “at the market” offering as defined in Rule 415(a)(4) under the Securities Act, including without limitation sales made directly on The Nasdaq Capital Market, on any other existing trading market for our securities or to or through a market maker. We will name in a prospectus supplement any agent involved in the offer or sale of our securities.

If we utilize a dealer in the sale of our securities being offered by this prospectus, we will sell our securities to the dealer, as principal. The dealer may then resell our 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 our 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 that the underwriter will use to make resales of our securities to the public. In connection with the sale of our securities, we or the purchasers of our 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 our securities to or through dealers, and the underwriter may compensate those dealers in the form of discounts, concessions or commissions.

We will provide in the applicable prospectus supplement any compensation we will pay to underwriters, dealers or agents in connection with the offering of our securities, and any discounts, concessions or commissions allowed by underwriters to participating dealers. Underwriters, dealers and agents participating in the distribution of our 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 our securities may be deemed to be underwriting discounts and commissions. In the event that an offering made pursuant to this prospectus is subject to FINRA Rule 5121, the prospectus supplement will comply with the prominent disclosure provisions of that rule.

To facilitate the offering of our securities, certain persons participating in the offering may engage in transactions that stabilize, maintain or otherwise affect the price of our securities. This may include over-allotments or short sales of our securities, which involves 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 our securities by bidding for or purchasing our securities 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 our securities at a level above that which might otherwise prevail in the open market. These transactions may be discontinued at any time.

We may authorize underwriters, dealers or agents to solicit offers by certain purchasers to purchase our securities from us at the public offering price set forth in the prospectus supplement pursuant to delayed delivery contracts providing for payment and delivery on a specified date in the future. The contracts will be subject only to those conditions set forth in the prospectus supplement, and the prospectus supplement will set forth any commissions we pay for solicitation of these contracts.

We may enter into derivative transactions with third parties, or sell our securities not covered by this prospectus to third parties in privately negotiated transactions. If the applicable prospectus supplement so indicates, in connection with any derivative transaction, the third parties may sell our securities covered by this prospectus and the applicable prospectus supplement, including in short sale transactions. If so, the third party may use our securities pledged by us or borrowed from us or others to settle those sales or to close out any related open borrowings of securities, and may use our securities received from us in settlement of those derivatives to close out any related open borrowings of securities. The third party in such sale transactions will be an underwriter and will be identified in the applicable prospectus supplement or a post-effective amendment to the registration statement of which this prospectus is a part. In addition, we may otherwise loan or pledge our securities to a financial institution or other third party that in turn may sell our securities short using this prospectus. Such financial institution or other third party may transfer its economic short position to investors in our securities or in connection with a concurrent offering of other securities.

Any securities offered other than common stock will be a new issue and, other than the common stock, which is listed on The Nasdaq Capital Market, will have no established trading market. We may elect to list any series of securities on an exchange, and in the case of the common stock, on any additional exchange, but, unless otherwise specified in the applicable prospectus supplement and/or other offering material, we will not be obligated to do so. No assurance can be given as to the liquidity of the trading market for any of the securities.

Any underwriters, dealers and agents may engage in transactions with us, or perform services for us, in the ordinary course of business. We may provide the underwriters, dealers and agents with indemnification against civil liabilities, including liabilities under the Securities Act, or contribution with respect to payments that they may make with respect to these liabilities.

McGuireWoods LLP, New York, New York, will pass upon the validity of any securities we offer by this prospectus. If the validity of any securities is also passed upon by counsel for the underwriters of an offering of those securities, that counsel will be named in the prospectus supplement relating to that offering.

The consolidated financial statements of Cleveland BioLabs, Inc. appearing in Cleveland BioLabs, Inc.’s Annual Report on Form 10-K for the year ended December 31, 2019 have been audited by Meaden & Moore, an independent registered public accounting firm, as set forth in its report thereon, included therein and incorporated herein by reference. Such financial statements are, and audited financial statements to be included in subsequently filed documents will be, incorporated herein in reliance upon the reports of Meaden & Moore pertaining to such financial statements as of the date (to the extent covered by consents filed with the SEC) given on the authority of such firm as experts in accounting and auditing.

We file reports and proxy statements with the SEC. These filings include our Annual Report on Form 10-K, Quarterly Reports on Form 10-Q, Current Reports on Form 8-K and proxy statements on Schedule 14A, as well as any amendments to those reports and proxy statements, which are available free of charge through our website as soon as reasonably practicable after we file them with, or furnish them to, the SEC. Our Internet website address is www.cbiolabs.com. Our website and the information contained on, or that can be accessed through, the website will not be deemed to be incorporated by reference in, and are not considered part of, this prospectus. You should not rely on any such information in making your decision whether to purchase our securities. The SEC also maintains a website at www.sec.gov that contains reports, proxy and information statements and other information regarding us and other issuers that file electronically with the SEC.

We have filed with the SEC a registration statement on Form S-3 under the Securities Act relating to the securities being offered by this prospectus. This prospectus, which constitutes part of that registration statement, does not contain all of the information set forth in the registration statement or the exhibits and schedules which are part of the registration statement. For further information about us and the securities offered, see the registration statement and the exhibits and schedules thereto. Statements contained in this prospectus regarding the contents of any contract or any other document to which reference is made are not necessarily complete, and, in each instance where a copy of a contract or other document has been filed as an exhibit to the registration statement, reference is made to the copy so filed, each of those statements being qualified in all respects by the reference.

The SEC allows us to “incorporate by reference” into this prospectus the information we file with the SEC in other documents, which means that we can disclose important information to you by referring you to those documents instead of having to repeat the information in this prospectus. The information incorporated by reference is considered to be part of this prospectus, and later information that we file with the SEC will automatically update and supersede such information. We incorporate by reference the documents listed below and any future information filed (rather than furnished) with the SEC under Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act between the date of this prospectus and the date all securities to which this prospectus relates have been sold or the offering is otherwise terminated and also between the date of the initial registration statement and prior to effectiveness of the registration statement, provided, however, that we are not incorporating any information furnished under Item 2.02 or Item 7.01 of any Current Report on Form 8-K:

A statement contained in a document incorporated by reference into this prospectus shall be deemed to be modified or superseded for purposes of this prospectus to the extent that a statement contained in this prospectus, any prospectus supplement or in any other subsequently filed document which is also incorporated in this prospectus modifies or replaces such statement. Any statements so modified or superseded shall not be deemed, except as so modified or superseded, to constitute a part of this prospectus.

Common Stock	Per Share		Total
Offering price	$	2.0945	$	3,175,006.47
Placement agent fees⁽¹⁾	$	0.1519	$	230,187.97
Proceeds, before expenses, to us⁽²⁾	$	1.9366	$	2,944,818.50

	Page
Prospectus Supplement
About this Prospectus Supplement	S-i
Cautionary Note Regarding Forward-Looking Statements	S-ii
Prospectus Supplement Summary	S-1
Risk Factors	S-4
Use of Proceeds	S-5
Private Placement of Warrants	S-6
Dilution	S-6
Plan of Distribution	S-7
Legal Matters	S-9
Experts	S-9
Where You Can Find More Information; Information Incorporated by Reference	S-9

Prospectus
About This Prospectus	1
Cautionary Note Regarding Forward-Looking Statements	1
About Cleveland BioLabs	2
Risk Factors	4
Use of Proceeds	4
Dilution	4
Securities We May Offer	4
Plan of Distribution	9
Legal Matters	11
Experts	11
Where You Can Find More Information	12
Incorporation by Reference	12

Offering price per share	$	2.09450
Net tangible book value per share at March 31, 2020	$	0.06835
Increase per share attributable to investors purchasing shares in this offering	$	0.20734
As adjusted net tangible book value per share after giving effect to this offering	$	0.27569
Dilution to investors purchasing our common stock in this offering	$	1.81881