Exhibit 4.3

NEITHER THIS WARRANT NOR THE SECURITIES ISSUABLE UPON EXERCISE OF THIS WARRANT HAVE BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR UNDER THE SECURITIES LAWS OF APPLICABLE STATES. THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE ACT AND THE APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION UNDER SUCH LAWS OR EXEMPTION FROM SUCH REGISTRATION REQUIREMENTS. HOLDERS SHOULD BE AWARE THAT THEY MAY BE REQUIRED TO BEAR THE FINANCIAL RISKS OF THIS INVESTMENT FOR AN INDEFINITE PERIOD OF TIME. THE ISSUER OF THESE SECURITIES MAY REQUIRE AN OPINION OF COUNSEL IN FORM AND SUBSTANCE SATISFACTORY TO THE ISSUER TO THE EFFECT THAT ANY PROPOSED TRANSFER OR RESALE IS IN COMPLIANCE WITH THE ACT AND ANY APPLICABLE STATE SECURITIES LAWS.

GRAYBUG VISION, INC.

WARRANT TO PURCHASE COMMON STOCK

Issued on December 11, 2019

This certifies that that for good and valuable consideration, receipt of which is hereby acknowledged, SG DAN Equity Holdings, LLC or his/her/its registered assigns (“Holder”) is entitled, subject to the terms and conditions of this Warrant, to purchase from Graybug Vision, Inc., a Delaware corporation (the “Company”), at a price per share equal to the Warrant Price (as defined below), at any time prior to the Expiration Date (as defined below), up to that number of Vested Warrant Shares (as defined below), upon surrender of this Warrant at the principal offices of the Company, together with a duly executed subscription form in the form attached hereto as Exhibit 1 and simultaneous payment of an amount equal to the product obtained by multiplying the Warrant Price by the number of Vested Warrant Shares so purchased in lawful money of the United States. The Warrant Price and the number and character of shares of Warrant Stock purchasable under this Warrant are subject to adjustment as provided herein.

This Warrant is issued in connection with that certain Consulting Agreement dated September 3, 2019 between the Company and Holder (the “Consulting Agreement”) and satisfies all obligations to issue equity to Holder under the Consulting Agreement.

1. DEFINITIONS. The following definitions shall apply for purposes of this Warrant:

“Act” means the Securities Act of 1933, as amended.

“Business Day” means a weekday on which banks are open for general banking business in San Francisco, California.

“Change of Control” means a Deemed Liquidation Event (as defined in the Company’s Amended and Restated Certificate of Incorporation, as the same may be amended from time to time (the “Restated Certificate”)).

“Company” shall include, in addition to the Company identified in the opening paragraph of this Warrant, any corporation or other entity that succeeds to the Company’s obligations under this Warrant, whether by permitted assignment, by merger or consolidation or otherwise.

“Expiration Date” means 5:00 p.m. Pacific Time on December 11, 2029, or such earlier date and time on which this Warrant ceases to be exercisable as provided in Section 4 hereof.

“Initial Public Offering” means a firm commitment underwritten public offering pursuant to an effective registration statement filed under the Act covering the offer and sale of the Company’s Common Stock for the account of the Company.

“Person” means an individual, corporation, limited liability company, partnership, association, joint-stock company, trust, unincorporated organization, joint venture or other entity or any governmental authority.

“Securities” means collectively this Warrant and the Warrant Stock issuable upon exercise of this Warrant.

“Total Warrant Shares” means 250,000 shares of Warrant Stock.

“Vested Warrant Shares” means Warrant Shares that are vested pursuant to Section 2.1 below.

“Warrant” means this Warrant and any warrant(s) delivered in substitution or exchange therefor, as provided herein.

“Warrant Price” means $0.43 per share. The Warrant Price is subject to adjustment as provided herein.

“Warrant Stock” means the Company’s Common Stock, $0.0001 par value per share. The number and character of shares of Warrant Stock are subject to adjustment as provided herein and the term “Warrant Stock” shall include stock and other securities and property at any time receivable or issuable upon exercise of this Warrant taking into account all such adjustments.

“Warrant Shares” means shares of the Warrant Stock.

2. EXERCISE.

2.1 Vesting and Exercisability. This warrant will become vested and exercisable as to portions of the Total Warrant Shares as follows: (i) this Warrant shall not vest nor be exercisable with respect to any of the Warrant Shares until October 3, 2019 (the “First Vesting Date”); (ii) on the First Vesting Date, this Warrant shall become vested and exercisable as to 1/12^th of the Total Warrant Shares; and (iii) thereafter on the same day of each full succeeding calendar month this Warrant will become vested and exercisable as to an additional 1/12^th of the Total Warrant Shares subject to this Warrant until this Warrant is vested with respect to 100% of the Total Warrant Shares.

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2.2 Method of Exercise. Subject to the terms and conditions of this Warrant, Holder may exercise this Warrant in whole or in part, at any time or from time to time, on any Business Day on or before the Expiration Date, for up to that number of Vested Warrant Shares. This Warrant shall be exercised by surrendering this Warrant at the principal offices of the Company, with the subscription form attached hereto duly executed by Holder, and by payment in a form specified in Section 2.3 hereof of an amount equal to the product obtained by multiplying (a) the number of Vested Warrant Shares to be purchased by Holder by (b) the Warrant Price as determined in accordance with the terms hereof.

2.3 Form of Payment. Payment for the Warrant Stock upon exercise may be made by (a) a check payable to the Company’s order, (b) wire transfer of funds to the Company or (c) any combination of the foregoing.

2.4 Partial Exercise. Upon a partial exercise of this Warrant, the number of shares of Warrant Stock issuable upon exercise of this Warrant immediately prior to such exercise shall be reduced by the aggregate number of shares of Warrant Stock issued upon such exercise of this Warrant.

2.5 No Fractional Shares. No fractional shares may be issued upon any exercise of this Warrant. If upon exercise of this Warrant in whole or in part, a fraction of a share would otherwise result, then in lieu of such fractional share, the Company shall pay to Holder an amount in cash equal to such fraction of a share multiplied by the applicable Warrant Price.

2.6 Restrictions on Exercise. This Warrant may not be exercised if the issuance of the Warrant Stock upon such exercise would constitute a violation of any applicable federal or state securities laws or other laws or regulations. As a condition to the exercise of this Warrant, Holder shall execute the subscription form attached hereto as Exhibit 1, confirming and acknowledging that the representations and warranties set forth in Section 6 hereof as they apply to Holder are true and complete as of the date of exercise.

3. ISSUANCE OF STOCK. Except as set forth in Section 4 hereof, this Warrant shall be deemed to have been exercised immediately prior to the close of business on the date of its surrender for exercise as provided above, and the Person entitled to receive the shares of Warrant Stock issuable upon such exercise shall be treated for all purposes as the holder of record of such shares as of the close of business on such date. As soon as practicable on or after such date, the Company shall issue and deliver to the Person or Persons entitled to receive the same a certificate or certificates for the number of whole shares of Warrant Stock issuable upon such exercise, together with payment of any fractional shares pursuant to Section 2.5 hereof.

4. [RESERVED]

5. ADJUSTMENT PROVISIONS. The number and character of shares of Warrant Stock issuable upon exercise of this Warrant and the Warrant Price therefor, are subject to adjustment upon each event specified in Sections 5.1 through 5.4 hereof occurring between the date this Warrant is issued and the earlier of the time that it is exercised in full or the Expiration Date:

5.1 Adjustment for Stock Splits and Stock Dividends. The Warrant Price and the number of shares of Warrant Stock for which this Warrant remains exercisable shall each be proportionally adjusted to reflect any stock dividend, stock split, reverse stock split or other similar event affecting the number of outstanding shares of Warrant Stock.

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5.2 Adjustment for Other Dividends and Distributions. In case the Company shall make or issue, or shall fix a record date for the determination of eligible holders entitled to receive a dividend or other distribution payable with respect to the Warrant Stock that is payable in (a) securities of the Company (other than issuances with respect to which adjustment is made under Section 5.1 or Section 5.3 hereof) or (b) assets (other than cash) which dividend or distribution is actually made (each a “Dividend Event”), then, and in each such case, Holder, upon exercise of this Warrant at any time after such Dividend Event, shall receive, in addition to the shares of Warrant Stock, the securities or such other assets of the Company that would have been payable to Holder if Holder had completed such exercise of this Warrant, immediately prior to such Dividend Event.

5.3 Adjustment for Reorganization, Consolidation, Merger. (a) In case of any recapitalization or reorganization of the Company or (b) in case the Company shall consolidate with or merge into one or more other corporations or entities which results in a change of the Warrant Stock, in each case other than a Change of Control (each, a “Reorganization Event”), then, and in each such case, Holder, upon the exercise of this Warrant after such Reorganization Event, shall be entitled to receive, in lieu of the stock or other securities and property that Holder would have been entitled to receive upon such exercise prior to such Reorganization Event, the stock or other securities or property which Holder would have been entitled to receive upon such Reorganization Event if, immediately prior to such Reorganization Event, Holder had completed such exercise of this Warrant, all subject to further adjustment as provided in this Warrant. If after such Reorganization Event, this Warrant is exercisable for securities of a corporation or entity other than the Company, then such corporation or entity shall duly execute and deliver to Holder a supplement hereto acknowledging such corporation’s or other entity’s obligations under this Warrant; and in each such case, the terms of this Warrant shall be applicable to the shares of stock or other securities or property receivable upon the exercise of this Warrant after the consummation of such Reorganization Event.

5.4 Conversion of Stock. In case all (a) the authorized Warrant Stock is converted, pursuant to the Restated Certificate, into other securities or property of the Company, or (b) the Warrant Stock otherwise ceases to exist or to be authorized by the Restated Certificate (each, a “Stock Event”), then Holder, upon exercise of this Warrant at any time after such Stock Event, shall receive, in lieu of the number of shares of Warrant Stock that would have been issuable upon exercise of this Warrant immediately prior to such Stock Event, the stock and other securities and property that Holder would have been entitled to receive upon the Stock Event, if, immediately prior to such Stock Event, Holder had completed such exercise of this Warrant.

5.5 Notice of Adjustments. The Company shall promptly give written notice of each adjustment under this Section 5 of the Warrant Price or the number of shares of Warrant Stock or other securities that remain issuable upon exercise of this Warrant. The notice shall describe the adjustment and show in reasonable detail the facts on which the adjustment or readjustment is based.

5.6 No Change Necessary. The form of this Warrant need not be changed because of any adjustment in the Warrant Price or in the number of shares of Warrant Stock issuable upon its exercise.

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5.7 Reservation of Stock. If the number of shares of Warrant Stock or other securities issuable upon exercise of this Warrant that are authorized and unissued under the Restated Certificate shall not be sufficient to effect the exercise of this Warrant in full, the Company will promptly take such corporate action as may, in the opinion of its counsel, be necessary to increase its authorized but unissued shares of Warrant Stock or other securities issuable upon exercise of this Warrant as shall be sufficient for such purpose.

6. REPRESENTATIONS; WARRANTIES AND CERTAIN AGREEMENTS OF HOLDER. Holder hereby represents and warrants to, and agrees with, the Company, that:

6.1 Purchase for Own Account. The Securities will be acquired for investment for Holder’s own account, not as a nominee or agent, and not with a view to the public resale or distribution thereof within the meaning of the Act, and Holder has no present intention of selling, granting any participation in, or otherwise distributing the same.

6.2 Disclosure of Information. Holder has received or has had full access to all the information it considers necessary or appropriate to make an informed investment decision with respect to the Securities. Holder further has had an opportunity to ask questions and receive answers from the Company regarding the terms and conditions of the offering of the Securities and to obtain additional information (to the extent the Company possessed such information or could acquire it without unreasonable effort or expense) necessary to verify any information furnished to Holder or to which Holder had access.

6.3 Investment Experience. Holder understands that the purchase of the Securities involves substantial risk. Holder (a) has experience as an investor in securities of companies in the development stage and acknowledges that Holder is able to fend for itself, can bear the economic risk of Holder’s investment in the Securities and has such knowledge and experience in financial or business matters that Holder is capable of evaluating the merits and risks of this investment in the Securities and protecting its own interests in connection with this investment and/or (b) has a preexisting personal or business relationship with the Company and certain of its officers, directors or controlling Persons of a nature and duration that enables such Holder to be aware of the character, business acumen and financial circumstances of such Persons.

6.4 Accredited Investor Status. Holder is familiar with the definition of, and qualifies as, an “accredited investor” within the meaning of Regulation D promulgated under the Act.

6.5 Restricted Securities. Holder understands that the Securities are characterized as “restricted securities” under the Act and Rule 144 promulgated thereunder inasmuch as they are being acquired from the Company in a transaction not involving a public offering, and that under the Act and applicable regulations thereunder such securities may be resold without registration under the Act only in certain limited circumstances. In this connection, Holder is familiar with Rule 144, as presently in effect, and understands the resale limitations imposed thereby and by the Act. Holder understands that the Company is under no obligation to register any of the securities sold hereunder. Holder understands that no public market now exists for any of the Securities and that it is uncertain whether a public market will ever exist for the Securities.

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6.6 No Solicitation. At no time was Holder presented with or solicited by any publicly issued or circulated newspaper, mail, radio, television or other form of general advertising or solicitation in connection with the offer, sale and purchase of the Securities.

6.7 Further Limitations on Disposition. Without in any way limiting the representations and warranties of Holder set forth above, Holder agrees not to make any disposition of all or any portion of the Securities unless and until: (a) there is then in effect a registration statement under the Act covering such proposed disposition and such disposition is made in accordance with such registration statement; or (b) Holder shall have notified the Company of the proposed disposition, and shall have furnished the Company with a statement of the circumstances surrounding the proposed disposition, and, upon request of the Company, with an opinion of counsel, at the expense of Holder or its transferee, reasonably satisfactory to the Company, that such disposition will not require registration of such securities under the Act.

6.8 Legends. Holder understands and agrees that the certificates evidencing the Securities will bear legends substantially similar to those set forth below in addition to any other legend that may be required by applicable law, by the Restated Certificate or the Company’s Bylaws, or by any agreement between the Company and Holder:

(a) THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR UNDER THE SECURITIES LAWS OF APPLICABLE STATES. THESE SECURITIES ARE SUBJECT TO RESTRICTIONS ON TRANSFERABILITY AND RESALE AND MAY NOT BE TRANSFERRED OR RESOLD EXCEPT AS PERMITTED UNDER THE ACT AND THE APPLICABLE STATE SECURITIES LAWS, PURSUANT TO REGISTRATION OR EXEMPTION THEREFROM. HOLDER SHOULD BE AWARE THAT THEY MAY BE REQUIRED TO BEAR THE FINANCIAL RISKS OF THIS INVESTMENT FOR AN INDEFINITE PERIOD OF TIME. THE ISSUER OF THESE SECURITIES MAY REQUIRE AN OPINION OF COUNSEL IN FORM AND SUBSTANCE SATISFACTORY TO THE ISSUER TO THE EFFECT THAT ANY PROPOSED TRANSFER OR RESALE IS IN COMPLIANCE WITH THE ACT.

(b) THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A 180 DAY MARKET STAND-OFF RESTRICTION AS SET FORTH IN A CERTAIN AGREEMENT BETWEEN THE ISSUER AND THE ORIGINAL HOLDER OF THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL OFFICE OF THE ISSUER. AS A RESULT OF SUCH AGREEMENT, THESE SHARES MAY NOT BE TRADED PRIOR TO 180 DAYS AFTER THE EFFECTIVE DATE OF THE PUBLIC OFFERING OF THE COMMON STOCK OF THE ISSUER HEREOF. SUCH RESTRICTION IS BINDING ON TRANSFEREES OF THESE SHARES.

(c) Any legend required by the laws of the State of California, including any legend required by the California Department of Corporations and Sections 417 and 418 of the California Corporations Code or any other state securities laws.

The legend set forth in (a) above shall be removed by the Company from any certificate evidencing the Securities upon delivery to the Company of an opinion of counsel, reasonably satisfactory to the Company, that a registration statement under the Act is at that time in effect with respect to the legended security or that such security can be freely transferred in a public sale (other than pursuant to Rule 144 or Rule 145 under the Act) without such a registration statement being in effect and that such transfer will not jeopardize the exemption or exemptions from registration pursuant to which the Company issued the Securities. No opinion shall be required for routine transactions under Rule 144.

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6.9 “Market Stand-Off” Agreement. Holder hereby agrees that it shall not, to the extent requested by the Company or an underwriter of securities of the Company, sell or otherwise transfer or dispose of any Securities or other shares of stock of the Company then owned by Holder (other than to donees or partners of Holder who agree to be similarly bound) for up to one hundred eighty (180) days following the effective date of a registration statement of the Company filed under the Act. For purposes of this Section 6.9, the term “Company” shall include any wholly-owned subsidiary of the Company into which the Company merges or consolidates. In order to enforce the foregoing covenant, the Company shall have the right to impose stop transfer instructions with respect to the Securities and such other Company securities of Holder (and the shares or securities of every other Person subject to the foregoing restriction) until the end of such period. Holder further agrees to enter into any agreement reasonably required by the underwriters to implement the foregoing within any reasonable timeframe so requested.

7. NO RIGHTS OR LIABILITIES AS STOCKHOLDER. This Warrant does not by itself entitle Holder to any voting rights or other rights as a stockholder of the Company. In the absence of affirmative action by Holder to purchase Warrant Stock by exercise of this Warrant, no provisions of this Warrant, and no enumeration herein of the rights or privileges of Holder, shall cause Holder to be a stockholder of the Company for any purpose.

8. GENERAL PROVISIONS.

8.1 Attorneys’ Fees. In the event any party is required to engage the services of any attorneys for the purpose of enforcing this Warrant, or any provision thereof, the prevailing party shall be entitled to recover its reasonable expenses and costs in enforcing this Warrant, including attorneys’ fees.

8.2 Transfer. Except as expressly provided hereunder, neither this Warrant nor any rights hereunder may be assigned, conveyed or transferred by Holder, in whole or in part, without the Company’s prior written consent, which the Company may withhold in its sole discretion. The rights and obligations of the Company and the Holder under this Warrant shall be binding upon and benefit their respective permitted successors, assigns, heirs, administrators and transferees.

8.3 Governing Law. This Warrant shall be governed by and construed under the internal laws of the State of California as applied to agreements among California residents entered into and to be performed entirely within California, without reference to principles of conflict of laws or choice of laws.

8.4 Headings. The headings and captions used in this Warrant are used only for convenience and are not to be considered in construing or interpreting this Warrant. All references in this Warrant to Sections and Exhibits shall, unless otherwise provided, refer to sections hereof and exhibits attached hereto, all of which exhibits are incorporated herein by this reference.

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8.5 Notices. Unless otherwise provided herein, any notice required or permitted under this Warrant shall be given in writing and shall be deemed effectively given (a) at the time of personal delivery, if delivery is in person; (b) one (1) Business Day after deposit with an express overnight courier for United States deliveries, or three (3) Business Days after deposit with an international express overnight air courier for deliveries outside of the United States, in each case with proof of delivery from the courier requested; or (c) four (4) Business Days after deposit in the United States mail by certified mail (return receipt requested) for United States deliveries, when addressed to the party to be notified at the address indicated for such party on the signature page hereto or, in the case of the Company, at principal offices of the Company located at 275 Shoreline Dr., Suite 450, Redwood City, CA 94065, or at such other address as any party hereto may designate by giving ten (10) days’ advance written notice to all other parties in accordance with the provisions of this Section 8.5.

8.6 Amendment; Waiver. Any term of this Warrant may be amended, and the observance of any term of this Warrant may be waived (either generally or in a particular instance and either retroactively or prospectively) only with the written consent of the Company and Holder. Any amendment or waiver effected in accordance with this Section 8.6 shall be binding upon Holder.

8.7 Severability. If one or more provisions of this Warrant are held to be unenforceable under applicable law, then such provision(s) shall be excluded from this Warrant to the extent they are unenforceable and the remainder of this Warrant shall be interpreted as if such provision(s) were so excluded and shall be enforceable in accordance with its terms.

8.8 Entire Agreement. This Warrant and the documents referred to herein, together with all the exhibits and schedules hereto and thereto, constitute the entire agreement and understanding of the parties with respect to the subject matter hereof and supersedes any and all prior negotiations, correspondence, warrants, agreements, understandings duties or obligations between the parties with respect to the subject matter hereof.

[SIGNATURE PAGE FOLLOWS]

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IN WITNESS WHEREOF, the parties hereto have executed this Warrant to Purchase Common Stock as of the date first written above.

AGREED AND ACKNOWLEDGED:

HOLDER:

SG DAN EQUITY HOLDINGS, LLC

[SIGNATURE PAGE TO WARRANT TO PURCHASE COMMON STOCK OF GRAYBUG VISION, INC.]

EXHIBIT 1

FORM OF SUBSCRIPTION

(To be completed and signed only upon exercise of Warrant)

To: Graybug Vision, Inc. (the “Company”)

We refer to that certain Warrant to Purchase Common Stock of the Company issued on December 11, 2019 (the “Warrant”).

☐ Cash Exercise. On the terms and conditions set forth in the Warrant, the undersigned Holder hereby elects to purchase                      shares of Common Stock of Graybug Vision, Inc. (the “Warrant Stock”), pursuant to the terms of the attached Warrant, and tenders herewith payment of the purchase price for such shares in full.

In exercising the Warrant, the undersigned Holder hereby confirms and acknowledges that the representations and warranties set forth in Section 6 of the Warrant as they apply to the undersigned Holder are true and complete as of this date. Please issue a certificate or certificates representing such shares of Warrant Stock in Holder’s name and deliver such certificate(s) to Holder at the address set forth below:

WHEREFORE, the undersigned Holder has executed and delivered the Warrant and this Subscription Form as of the date set forth below.

HOLDER:

SG DAN EQUITY HOLDINGS, LLC