Exhibit 4.3


 


Warrant
Agent Agreement


 


This WARRANT AGENT AGREEMENT
(this “Warrant Agreement”) dated as of October 6, 2022 (the “Issuance Date”) is by
and between Avenue Therapeutics, Inc, a Delaware corporation (the “Company”), and VStock Transfer, LLC (the “Warrant
Agent”).


 


WHEREAS, pursuant to
the terms of that certain Underwriting Agreement (“Underwriting Agreement”), dated October 6, 2022, by and between
the Company and Aegis Capital Corp., as the underwriter set forth therein (the “Underwriter”), the Company is selling
in a public offering of (i) 2,652,065 units (the “Units”), with each Unit consisting of one (1) share of
common stock, par value $0.0001 per share (“Common Stock”), and one (1) warrant to purchase one share of Common
Stock at an exercise price of $3.30 (each, a “Warrant” and collectively, the “Warrants”), (ii) 984,300
pre-funded units (the “Pre-funded Units”), with each Pre-funded Unit consisting of one (1) Warrant and one (1) pre-funded
warrant to purchase one (1) share of Common Stock at an exercise price of $0.0001 per share of Common Stock (each, a “Pre-funded
Warrant” and collectively, the “Pre-funded Warrants”), and (iii) (x) up to 545,454 shares of Common
Stock and/or Pre-funded Units and/or (y) additional Warrants to purchase up to 545,454 shares of Common Stock, in each case pursuant
to the Underwriter’s over-allotment option granted pursuant to the Underwriting Agreement.


 


WHEREAS, the Company
has filed, with the Securities and Exchange Commission (the “SEC”), a registration statement on Form S-1 (Registration
No. 333-267206) (as the same may be amended from time to time, the “Registration Statement”), for the registration,
under the Securities Act of 1933, as amended (the “Act”), of the offer and sale of the Units, Pre-funded Units, Common
Stock, Warrants, Pre-funded Warrants, and Common Stock underlying Pre-funded Warrants and Warrants, and such Registration Statement was
declared effective on October 6, 2022;


 


WHEREAS, the Company
desires the Warrant Agent to act on behalf of the Company, and the Warrant Agent is willing to so act, in accordance with the terms set
forth in this Warrant Agreement in connection with the issuance, registration, transfer, exchange and exercise of the Warrants and the
Pre-funded Warrants;


 


WHEREAS, the Company
desires to provide for the provisions of the Warrants and the Pre-funded Warrants, the terms upon which they shall be issued and exercised,
and the respective rights, limitation of rights, and immunities of the Company, the Warrant Agent, and the holders of the Warrants and
the Pre-funded Warrants; and


 


WHEREAS, all acts and
things have been done and performed which are necessary to make the Warrants and the Pre-funded Warrants the valid, binding and legal
obligations of the Company, and to authorize the execution and delivery of this Warrant Agreement;


 


NOW, THEREFORE,
in consideration of the mutual agreements herein contained, the parties hereto agree as follows:


 


	 	1.	Appointment of Warrant Agent. The Company hereby appoints the Warrant Agent to act as agent for the Company with respect to the Warrants and the Pre-funded Warrants, and the Warrant Agent hereby accepts such appointment and agrees to perform the same in accordance with the express terms and conditions set forth in this Warrant Agreement (and no implied terms or conditions).


 


	 	2.	Warrants.


 


2.1. Form of
Warrants. The Warrants and the Pre-funded Warrants shall each be registered securities and shall be evidenced by a global warrant
(each, a “Global Warrant”) in the forms of Exhibit A and Exhibit B to
this Warrant Agreement, which shall be deposited on behalf of the Company with a custodian for The Depository Trust Company (“DTC”)
and registered in the name of Cede & Co., a nominee of DTC. The terms of the Global Warrants are incorporated herein by reference.
If DTC subsequently ceases to make its book-entry settlement system available for the Warrants or the Pre-funded Warrants, the Company
may instruct the Warrant Agent regarding making other arrangements for book-entry settlement. In the event that the Warrants or the Pre-funded
Warrants are not eligible for, or it is no longer necessary to have such instruments available in, book-entry form, the Company may instruct
the Warrant Agent to provide written instructions to DTC to deliver to the Warrant Agent for cancellation the applicable Global Warrant,
and the Company shall instruct the Warrant Agent to deliver to DTC separate certificates evidencing Warrants or the Pre-funded Warrants
(“Definitive Certificates” and, together with the Global Warrants, “Warrant Certificates”)
registered as requested through the DTC system.


 


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2.2. Issuance and
Registration of Warrants.


 


2.2.1. Warrant Register.
The Warrant Agent shall maintain books (“Warrant Register”) for the registration of original issuance and the registration
of transfer of the Warrants and the Pre-funded Warrants.


 


2.2.2. Issuance of Warrants.
Upon the initial issuance of the Warrants and the Pre-funded Warrants, the Warrant Agent shall issue the Global Warrants and deliver the
Warrants and the Pre-funded Warrants in the DTC book-entry settlement system in accordance with written instructions delivered to the
Warrant Agent by the Company. Ownership of security entitlements in the Warrants and the Pre-funded Warrants shall be shown on, and the
transfer of such ownership shall be effected through, records maintained (i) by DTC and (ii) by institutions that have accounts
with DTC (each, a “Participant”).


 


2.2.3. Beneficial Owner;
Holder. Prior to due presentment for registration of transfer of any Warrant or Pre-funded Warrant, the Company and the Warrant Agent
may deem and treat the person in whose name that Warrant or Pre-funded Warrant shall be registered on the Warrant Register (the “Holder”)
as the absolute owner of such security for purposes of any exercise thereof, and for all other purposes, and neither the Company nor the
Warrant Agent shall be affected by any notice to the contrary; provided, that the rights of beneficial owners in a Warrant or Pre-funded
Warrant evidenced by a Global Warrant shall be exercised by the Holder or a Participant through the DTC system. Notwithstanding the foregoing,
nothing herein shall prevent the Company, the Warrant Agent or any agent of the Company or the Warrant Agent from giving effect to any
written certification, proxy or other authorization furnished by DTC governing the exercise of the rights of a holder of a beneficial
interest in any Warrant or Pre-funded Warrant.


 


2.2.4. Delivery of Warrant
Certificate. A Holder has the right to elect at any time or from time to time a Warrant Exchange (as defined below) pursuant to a
Warrant Certificate Request Notice (as defined below). Upon written notice by a Holder to the Warrant Agent for the exchange of some or
all of such Holder’s Global Warrants for a Warrant Certificate evidencing the same number of Warrants or Pre-funded Warrants, which
request shall be in the form attached hereto as Exhibit C (a “Warrant Certificate Request Notice” and
the date of delivery of such Warrant Certificate Request Notice by the Holder, the “Warrant Certificate Request Notice Date” and
the deemed surrender upon delivery by the Holder of a number of Global Warrants for the same number of Warrants or Pre-funded Warrants
evidenced by a Warrant Certificate, a “Warrant Exchange”), the Warrant Agent shall promptly effect the Warrant
Exchange and shall promptly issue and deliver to the Holder a Warrant Certificate for such number of Warrants or Pre-funded Warrants in
the name set forth in the Warrant Certificate Request Notice. Such Warrant Certificate shall be dated the date of issuance of the Warrant
Certificate, shall include the initial exercise date of the Warrants or Pre-funded Warrants, shall be executed by an authorized signatory
of the Company and shall be reasonably acceptable in all respects to such Holder. In connection with a Warrant Exchange, the Company agrees
to deliver, or to direct the Warrant Agent to deliver, the Warrant Certificate to the Holder within three (3) Business Days of the
Warrant Certificate Request Notice pursuant to the delivery instructions in the Warrant Certificate Request Notice (“Warrant
Certificate Delivery Date”). The Company covenants and agrees that, upon the date of delivery of the Warrant Certificate Request
Notice, the Holder shall be deemed to be the holder of the Warrant Certificate and, notwithstanding anything to the contrary set forth
herein, the Warrant Certificate shall be deemed for all purposes to contain all of the terms and conditions of the Warrants or Pre-funded
Warrants evidenced by such Warrant Certificate and the terms of this Agreement.


 


2.2.5. Execution.
The Warrant Certificates shall be executed on behalf of the Company by any authorized officer of the Company (an “Authorized
Officer”), which need not be the same authorized signatory for all of the Warrant Certificates, either manually or by facsimile
signature. The Warrant Certificates shall be countersigned by an authorized signatory of the Warrant Agent, which need not be the same
signatory for all of the Warrant Certificates, and no Warrant Certificate shall be valid for any purpose unless so countersigned. In case
any Authorized Officer of the Company that signed any of the Warrant Certificates ceases to be an Authorized Officer of the Company before
countersignature by the Warrant Agent and issuance and delivery by the Company, such Warrant Certificates, nevertheless, may be countersigned
by the Warrant Agent, issued and delivered with the same force and effect as though the person who signed such Warrant Certificates had
not ceased to be such officer of the Company; and any Warrant Certificate may be signed on behalf of the Company by any person who, at
the actual date of the execution of such Warrant Certificate, shall be an Authorized Officer of the Company authorized to sign such Warrant
Certificate, although at the date of the execution of this Warrant Agreement any such person was not such an Authorized Officer.


 


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2.2.6. Registration
of Transfer. At any time at or prior to the Expiration Date (as defined below), a transfer of any Warrants or Pre-funded Warrants
may be registered and any Warrant Certificate or Warrant Certificates may be split up, combined or exchanged for another Warrant Certificate
or Warrant Certificates evidencing the same number of Warrants or Pre-funded Warrants as the Warrant Certificate or Warrant Certificates
surrendered. Any Holder desiring to register the transfer of Warrants or Pre-funded Warrants or to split up, combine or exchange any Warrant
Certificate shall make such request in writing delivered to the Warrant Agent, and shall surrender to the Warrant Agent the Warrant Certificate
or Warrant Certificates evidencing the Warrants or Pre-funded Warrants the transfer of which is to be registered or that is or are to
be split up, combined or exchanged and, in the case of registration of transfer, shall provide a signature guarantee. Thereupon, the Warrant
Agent shall countersign and deliver to the person entitled thereto a Warrant Certificate or Warrant Certificates, as the case may be,
as so requested; provided, however that Warrants and Pre-funded Warrants may not be combined in the same
Warrant Certificate. The Company and the Warrant Agent may require payment, by the Holder requesting a registration of transfer of Warrants
or Pre-funded Warrants or a split-up, combination or exchange of a Warrant Certificate (but, for purposes of clarity, not upon the exercise
of the Warrants and issuance of Warrant Shares to the Holder), of a sum sufficient to cover any tax or governmental charge that may be
imposed in connection with such registration of transfer, split-up, combination or exchange, together with reimbursement to the Company
and the Warrant Agent of all reasonable expenses incidental thereto.


 


2.2.7. Loss, Theft and
Mutilation of Warrant Certificates. Upon receipt by the Company and the Warrant Agent of evidence reasonably satisfactory to them
of the loss, theft, destruction or mutilation of a Warrant Certificate, and, in case of loss, theft or destruction, of indemnity or security
in customary form and amount, and reimbursement to the Company and the Warrant Agent of all reasonable expenses incidental thereto, and
upon surrender to the Warrant Agent and cancellation of the Warrant Certificate if mutilated, the Warrant Agent shall, on behalf of the
Company, countersign and deliver a new Warrant Certificate of like tenor to the Holder in lieu of the Warrant Certificate so lost, stolen,
destroyed or mutilated. The Warrant Agent may charge the Holder an administrative fee for processing the replacement of lost Warrant Certificates.
The Warrant Agent may receive compensation from the surety companies or surety agents for administrative services provided to them.


 


2.2.8. Proxies.
The Holder of a Warrant or Pre-funded Warrant may grant proxies or otherwise authorize any person, including the Participants and beneficial
holders that may own interests through the Participants, to take any action that a Holder is entitled to take under this Agreement or
the Warrants or Pre-funded Warrants; provided, however, that at all times that Warrants or Pre-funded Warrants
are evidenced by a Global Warrant, exercise of those Warrants or Pre-funded Warrants shall be effected on their behalf by Participants
through DTC in accordance the procedures administered by DTC.


 


	 	3.	Terms and Exercise of Warrants.


 


3.1. Exercise Price.
Each Warrant shall entitle the Holder, subject to the provisions of the applicable Warrant Certificate and of this Warrant Agreement,
to purchase from the Company the number of shares of Common Stock stated therein, at the price of $3.30 per share of Common Stock, subject
to the subsequent adjustments provided in the Global Warrant. Each Pre-funded Warrant shall entitle the Holder, subject to the provisions
of the applicable Warrant Certificate and of this Warrant Agreement to purchase from the Company the number of shares of Common Stock
stated therein, at the price of $0.0001 per share of Common Stock, subject to the subsequent adjustments provided in the Global Warrant.
The term “Exercise Price” as used in this Warrant Agreement refers to the price per share at which shares
of Common Stock may be purchased at the time a Warrant or Pre-funded Warrant is exercised.


 


3.2. Duration of Warrants.
A Warrant may be exercised only during the period (“Exercise Period”) commencing on the date of issuance and ending
on the Termination Date. For purposes of this Warrant Agreement, the “Termination Date” shall have the meaning
set forth in the Global Warrant. Each Warrant not exercised on or before the Termination Date shall become void, and all rights thereunder
and all rights in respect thereof under this Agreement shall cease at the close of business on the Termination Date. The Pre-funded Warrants
do not expire.


 


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3.3. Exercise of Warrants.


 


3.3.1. Exercise.
Subject to the provisions of each Global Warrant, a Holder (or a Participant or a designee of a Participant acting on behalf of a Holder)
may exercise Warrants or Pre-funded Warrants by delivering to the Warrant Agent, not later than 5:00 P.M., Eastern Time, on any business
day during the Exercise Period a notice of exercise of the Warrants or Pre-funded Warrants to be exercised (i) in the form attached
to the Global Warrant or (ii) via an electronic warrant exercise through the DTC system (each, an “Election to Purchase”)
and, unless the cashless exercise procedure is specified in the applicable Election to Purchase, delivery of the aggregate Exercise Price
of the Warrant Shares specified in the applicable Election to Purchase. All other requirements for the exercise of a Warrant or Pre-funded
Warrant shall be as set forth in the Warrant or Pre-funded Warrant, respectively. Notwithstanding anything herein to the contrary, the
Holder shall not be required to physically surrender a Warrant Certificate to the Warrant Agent until the Holder has purchased all of
the Warrant Shares available thereunder and the applicable Warrant Certificate has been exercised in full, in which case, the Holder shall
surrender the Warrant Certificate to the Warrant Agent for cancellation within three (3) Trading Days of the date on which the final
Election to Purchase is delivered to the Warrant Agent. Partial exercises of a Warrant Certificate resulting in purchases of a portion
of the total number of Warrant Shares available thereunder shall have the effect of lowering the outstanding number of Warrant Shares
purchasable thereunder in an amount equal to the applicable number of Warrant Shares purchased.


 


3.3.2. The Warrant Agent shall,
by 5:00 P.M., Eastern Time, on the Trading Day following the Exercise Date (as defined below) of any Warrant or Pre-funded Warrant, advise
the Company, the transfer agent and registrar for the Company’s Common Stock, in respect of (i) the number of Warrant Shares
indicated on the Notice of Exercise as issuable upon such exercise with respect to such exercised Warrants, (ii) the instructions
of the Holder or Participant, as the case may be, provided to the Warrant Agent with respect to the delivery of the Warrant Shares and
the number of Warrants or Pre-Funded Warrants that remain outstanding after such exercise and (iii) such other information as the
Company or such transfer agent and registrar shall reasonably request. The Company shall issue the Warrant Shares in compliance with the
terms of the Warrant or Pre-funded Warrant, as applicable.


 


3.3.3. Valid Issuance.
All Warrant Shares issued by the Company upon the proper exercise of a Warrant or Pre-funded Warrant in conformity with this Warrant Agreement
shall be validly issued, fully paid and non-assessable.


 


3.3.4. No Fractional
Exercise. Notwithstanding any provision contained in this Warrant Agreement to the contrary, no fractional shares or scrip representing
fractional shares shall be issued upon the exercise of the Warrant or Pre-funded Warrant. As to any fraction of a share which the Holder
would otherwise be entitled to purchase upon such exercise, the Company shall, at its election, either pay a cash adjustment in respect
of such final fraction in an amount equal to such fraction multiplied by the Exercise Price or round up to the next whole share.


 


3.3.5. No Transfer Taxes.
The Company shall not be required to pay any stamp or other tax or governmental charge required to be paid in connection with any transfer
involved in the issue of the Warrant Shares upon the exercise of Warrants or Pre-funded Warrants; and in the event that any such transfer
is involved, the Company shall not be required to issue or deliver any Warrant Shares until such tax or other charge shall have been paid
or it has been established to the Company’s satisfaction that no such tax or other charge is due.


 


3.3.6. Date of Issuance.
The Company will treat an exercising Holder as a beneficial owner of the Warrant Shares as of the time of delivery of a Notice of Exercise
(as defined in the Warrant Certificate) to the Warrant Agent or the Company, and for purposes of Regulation SHO, a holder whose interest
in the Warrant or Pre-funded Warrant is a beneficial interest in certificate(s) representing the Warrant or Pre-funded Warrant held
in book-entry form through DTC shall be deemed to have exercised its interest in the Warrant or Pre-funded Warrant upon instructing its
broker that is a DTC participant to exercise its interest in the Warrant or Pre-funded Warrant (the date of any such exercise, an “Exercise
Date”), except that, if the Exercise Date is a date when the stock transfer books of the Company are closed, such person shall
be deemed to have become the holder of such shares at the open of business on the next succeeding date on which the stock transfer books
are open.


 


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4.       Adjustments.
Upon every adjustment of the Exercise Price or the number of Warrant Shares issuable upon exercise of a Warrant or Pre-funded Warrant,
the Company shall give written notice thereof to the Warrant Agent, which notice shall state the Exercise Price resulting from such adjustment
and the increase or decrease, if any, in the number of Warrant Shares purchasable at such price upon the exercise of a Warrant or Pre-funded
Warrant, setting forth in reasonable detail the method of calculation and the facts upon which such calculation is based. Upon the occurrence
of any event specified in Section 3 of the Warrant or Pre-funded Warrant, then, in any such event, the Company shall give written
notice to the Warrant Agent. Failure to give such notice, or any defect therein, shall not affect the legality or validity of such event.
The Warrant Agent shall be entitled to rely conclusively on, and shall be fully protected in relying on, any certificate, notice or instructions
provided by the Company with respect to any adjustment of the Exercise Price or the number of shares issuable upon exercise of a Warrant
or Pre-funded Warrant, or any related matter, and the Warrant Agent shall not be liable for any action taken, suffered or omitted to be
taken by it in accordance with any such certificate, notice or instructions or pursuant to this Warrant Agreement. The Warrant Agent shall
not be deemed to have knowledge of any such adjustment unless and until it shall have received written notice thereof from the Company.


 


5.       Restrictive
Legends; Fractional Warrants. In the event that a Warrant Certificate surrendered for transfer bears a restrictive legend, the Warrant
Agent shall not register that transfer until the Warrant Agent has received an opinion of counsel for the Company stating that such transfer
may be made and indicating whether the Warrants or Pre-funded Warrants must also bear a restrictive legend upon that transfer. The Warrant
Agent shall not be required to effect any registration of transfer or exchange which will result in the transfer of or delivery of a Warrant
Certificate for a fraction of a Warrant or Pre-funded Warrant.


 


	 	6.	Other Provisions Relating to Rights of Holders of Warrants.


 


6.1. No Rights as
Stockholder. Except as otherwise specifically provided herein, a Holder, solely in its capacity as a holder of Warrants or Pre-funded
Warrants, shall not be entitled to vote or receive dividends or be deemed the holder of share capital of the Company for any purpose,
nor shall anything contained in this Warrant Agreement be construed to confer upon a Holder, solely in its capacity as the registered
holder of Warrants or Pre-funded Warrants, any of the rights of a stockholder of the Company or any right to vote, give or withhold consent
to any corporate action (whether any reorganization, issue of stock, reclassification of share capital, consolidation, merger, conveyance
or otherwise), receive notice of meetings, receive dividends or subscription rights or rights to participate in new issues of shares,
or otherwise, prior to the issuance to the Holder of the Warrant Shares which it is then entitled to receive upon the due exercise of
Warrants or Pre-funded Warrants.


 


6.2. Reservation of
Common Stock. The Company shall at all times reserve and keep available a number of its authorized but unissued shares of Common Stock
that will be sufficient to permit the exercise in full of all outstanding Warrants and Pre-funded Warrants issued pursuant to this Warrant
Agreement.


 


	 	7.	Concerning the Warrant Agent and Other Matters.


 


7.1. Any instructions given
to the Warrant Agent orally, as permitted by any provision of this Warrant Agreement, shall be confirmed in writing by the Company as
soon as practicable. The Warrant Agent shall not be liable or responsible and shall be fully authorized and protected for acting, or failing
to act, in accordance with any oral instructions which do not conform with the written confirmation received in accordance with this Section 7.1.


 


7.2. (a) Whether or not
any Warrants or Pre-funded Warrants are exercised, for the Warrant Agent’s services as agent for the Company hereunder, the Company
shall pay to the Warrant Agent such fees as may be separately agreed between the Company and Warrant Agent. (b) All amounts owed
by the Company to the Warrant Agent under this Warrant Agreement are due within 30 days of the invoice date. Delinquent payments are subject
to a late payment charge of one and one-half percent (1.5%) per month commencing 45 days from the invoice date. The Company agrees to
reimburse the Warrant Agent for any attorney’s fees and any other costs associated with collecting delinquent payments. (c) No
provision of this Warrant Agreement shall require Warrant Agent to expend or risk its own funds or otherwise incur any financial liability
in the performance of any of its duties under this Warrant Agreement or in the exercise of its rights.


 


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7.3. As agent for the Company
hereunder the Warrant Agent: (a) shall have no duties or obligations other than those specifically set forth herein or as may subsequently
be agreed to in writing by the Warrant Agent and the Company; (b) shall be regarded as making no representations and having no responsibilities
as to the validity, sufficiency, value, or genuineness of the Warrants, Pre-funded Warrants or any Warrant Shares; (c) shall not
be obligated to take any legal action hereunder; if, however, the Warrant Agent determines to take any legal action hereunder, and where
the taking of such action might, in its judgment, subject or expose it to any expense or liability it shall not be required to act unless
it has been furnished with an indemnity reasonably satisfactory to it; (d) may rely on and shall be fully authorized and protected
in acting or failing to act upon any certificate, instrument, opinion, notice, letter or other document or security delivered to the Warrant
Agent and believed by it to be genuine and to have been signed by the proper party or parties; (e) shall not be liable or responsible
for any recital or statement contained in the Registration Statement or any other documents relating thereto; (f) shall not be liable
or responsible for any failure on the part of the Company to comply with any of its covenants and obligations relating to the Warrants
and Pre-funded Warrants, including without limitation obligations under applicable securities laws; (g) may rely on and shall be
fully authorized and protected in acting or failing to act upon the written, telephonic or oral instructions with respect to any matter
relating to its duties as Warrant Agent covered by this Warrant Agreement (or supplementing or qualifying any such actions) of officers
of the Company, and is hereby authorized and directed to accept instructions with respect to the performance of its duties hereunder from
the Company or counsel to the Company, and may apply to the Company, for advice or instructions in connection with the Warrant Agent’s
duties hereunder, and the Warrant Agent shall not be liable for any delay in acting while waiting for those instructions; any applications
by the Warrant Agent for written instructions from the Company may, at the option of the Warrant Agent, set forth in writing any action
proposed to be taken or omitted by the Warrant Agent under this Warrant Agreement and the date on or after which such action shall be
taken or such omission shall be effective; the Warrant Agent shall not be liable for any action taken by, or omission of, the Warrant
Agent in accordance with a proposal included in such application on or after the date specified in such application (which date shall
not be less than five business days after the date such application is sent to the Company, unless the Company shall have consented in
writing to any earlier date) unless prior to taking any such action, the Warrant Agent shall have received written instructions in response
to such application specifying the action to be taken or omitted; (h) may consult with counsel satisfactory to the Warrant Agent,
including its in-house counsel; (i) may perform any of its duties hereunder either directly or by or through nominees, correspondents,
designees, or subagents, and it shall not be liable or responsible for any misconduct or negligence on the part of any nominee, correspondent,
designee, or subagent appointed with reasonable care by it in connection with this Warrant Agreement; (j) is not authorized, and
shall have no obligation, to pay any brokers, dealers, or soliciting fees to any person; and (k) shall not be required hereunder
to comply with the laws or regulations of any country other than the United States of America or any political subdivision thereof.


 


7.4. (a) In the absence
of gross negligence or willful or illegal misconduct on its part, the Warrant Agent shall not be liable for any action taken, suffered,
or omitted by it or for any error of judgment made by it in the performance of its duties under this Warrant Agreement. Anything in this
Warrant Agreement to the contrary notwithstanding, in no event shall Warrant Agent be liable for special, indirect, incidental, consequential
or punitive losses or damages of any kind whatsoever (including but not limited to lost profits, liquidated damages or buy-in claims),
even if the Warrant Agent has been advised of the possibility of such losses or damages and regardless of the form of action. Any liability
of the Warrant Agent will be limited in the aggregate to the amount of fees paid by the Company hereunder. The Warrant Agent shall not
be liable for any failures, delays or losses, arising directly or indirectly out of conditions beyond its reasonable control including,
but not limited to, acts of government, exchange or market ruling, suspension of trading, work stoppages or labor disputes, fires,
civil disobedience, riots, rebellions, storms, electrical or mechanical failure, computer hardware or software failure, communications
facilities failures including telephone failure, war, terrorism, insurrection, earthquakes, floods, acts of God or similar occurrences.
(b) In the event any question or dispute arises with respect to the proper interpretation of the Warrants or the Warrant Agent’s
duties under this Warrant Agreement or the rights of the Company or of any Holder, the Warrant Agent shall not be required to act and
shall not be held liable or responsible for its refusal to act until the question or dispute has been judicially settled (and, if appropriate,
it may file a suit in interpleader or for a declaratory judgment for such purpose) by final judgment rendered by a court of competent
jurisdiction, binding on all persons interested in the matter which is no longer subject to review or appeal, or settled by a written
document in form and substance satisfactory to Warrant Agent and executed by the Company and each such Holder. In addition, the Warrant
Agent may require for such purpose, but shall not be obligated to require, the execution of such written settlement by all the Holders
and all other persons that may have an interest in the settlement.


 


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7.5. The Company covenants
to indemnify the Warrant Agent and hold it harmless from and against any loss, liability, claim or expense (“Loss”)
arising out of or in connection with the Warrant Agent’s duties under this Warrant Agreement, including the costs and expenses of
defending itself against any Loss, unless such Loss shall have been determined by a court of competent jurisdiction to be a result of
the Warrant Agent’s gross negligence or willful or illegal misconduct.


 


7.6. Unless terminated earlier
by the parties hereto, this Agreement shall terminate 90 days after the later of the Expiration Date and the date on which no Warrants
remain outstanding (the “Termination Date”). On the business day following the Termination Date,
the Agent shall deliver to the Company any entitlements, if any, held by the Warrant Agent under this Warrant Agreement. The Agent’s
right to be reimbursed for fees, charges and out-of-pocket expenses as provided in this Section 8 shall survive
the termination of this Warrant Agreement.


 


7.7. If any provision of this
Warrant Agreement shall be held illegal, invalid, or unenforceable by any court, this Warrant Agreement shall be construed and enforced
as if such provision had not been contained herein and shall be deemed an Agreement among the parties to it to the full extent permitted
by applicable law.


 


7.8. The Company represents
and warrants that: (a) it is duly incorporated and validly existing under the laws of its jurisdiction of incorporation; (b) the
offer and sale of the Warrants and Pre-funded Warrants and the execution, delivery and performance of all transactions contemplated thereby
(including this Warrant Agreement) have been duly authorized by all necessary corporate action and will not result in a breach of or constitute
a default under the articles of association, bylaws or any similar document of the Company or any indenture, agreement or instrument to
which it is a party or is bound; (c) this Warrant Agreement has been duly executed and delivered by the Company and constitutes the
legal, valid, binding and enforceable obligation of the Company; (d) the Warrants and Pre-funded Warrants will comply in all material
respects with all applicable requirements of law; and (e) to the best of its knowledge, there is no litigation pending or threatened
as of the date hereof in connection with the offering of the Warrants or Pre-funded Warrants.


 


7.9. In the event of inconsistency
between this Warrant Agreement and the terms set forth in the Warrant Certificate with respect to a Warrant or Pre-funded Warrant, as
it may from time to time be amended, the terms of the Warrant Certificate shall control.


 


7.10. Set forth in Exhibit D hereto
is a list of the names and specimen signatures of the persons authorized to act for the Company under this Warrant Agreement (the “Authorized
Representatives”). The Company shall, from time to time, certify to the Warrant Agent the names and signatures of any other
persons authorized to act for the Company under this Warrant Agreement.


 


7.11. Except as expressly
set forth elsewhere in this Warrant Agreement, all notices, instructions and communications under this Agreement shall be in writing,
shall be effective upon receipt and shall be addressed, if to the Company, to its address set forth beneath its signature to this Agreement,
or, if to the Warrant Agent, to VStock Transfer, LLC, 18 Lafayette Place, Woodmere, NY 11598, or to such other address of which a party
hereto has notified the other party.


 


7.12. (a) This Warrant
Agreement shall be governed by and construed in accordance with the laws of the State of New York. All actions and proceedings relating
to or arising from, directly or indirectly, this Warrant Agreement may be litigated in courts located within the Borough of Manhattan
in the City and State of New York. The Company hereby submits to the personal jurisdiction of such courts and consents that any service
of process may be made by certified or registered mail, return receipt requested, directed to the Company at its address last specified
for notices hereunder. (b) This Warrant Agreement shall inure to the benefit of and be binding upon the successors and assigns of
the parties hereto. This Warrant Agreement may not be assigned, or otherwise transferred, in whole or in part, by either party without
the prior written consent of the other party, which the other party will not unreasonably withhold, condition or delay; except that (i) consent
is not required for an assignment or delegation of duties by Warrant Agent to any affiliate of Warrant Agent and (ii) any reorganization,
merger, consolidation, sale of assets or other form of business combination by the Warrant Agent or the Company shall not be deemed to
constitute an assignment of this Warrant Agreement. (c) No provision of this Warrant Agreement may be amended, modified or waived,
except in a written document signed by both parties.


 


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7.13. Payment of Taxes.
The Company will from time to time promptly pay all taxes and charges that may be imposed upon the Company or the Warrant Agent in respect
of the issuance or delivery of Warrant Shares upon the exercise of Warrants and Pre-funded Warrants, but the Company may require the Holders
to pay any transfer taxes in respect of the Warrants or such shares. The Warrant Agent may refrain from registering any transfer of Warrants
or Pre-funded Warrants or any delivery of any Warrant Shares unless or until the persons requesting the registration or issuance shall
have paid to the Warrant Agent for the account of the Company the amount of such tax or charge, if any, or shall have established to the
reasonable satisfaction of the Company and the Warrant Agent that such tax or charge, if any, has been paid.


 


7.14. Resignation
of Warrant Agent.


 


7.14.1. Appointment
of Successor Warrant Agent. The Warrant Agent, or any successor to it hereafter appointed, may resign its duties and be discharged
from all further duties and liabilities hereunder after giving thirty (30) days’ notice in writing to the Company, or such shorter
period of time agreed to by the Company. The Company may terminate the services of the Warrant Agent, or any successor Warrant Agent,
after giving thirty (30) days’ notice in writing to the Warrant Agent or successor Warrant Agent, or such shorter period of time
as agreed. If the office of the Warrant Agent becomes vacant by resignation, termination or incapacity to act or otherwise, the Company
shall appoint in writing a successor Warrant Agent in place of the Warrant Agent. If the Company shall fail to make such appointment within
a period of 30 days after it has been notified in writing of such resignation or incapacity by the Warrant Agent, then the Warrant Agent
or any Holder may apply to any court of competent jurisdiction for the appointment of a successor Warrant Agent at the Company’s
cost. Pending appointment of a successor to such Warrant Agent, either by the Company or by such a court, the duties of the Warrant Agent
shall be carried out by the Company. Any successor Warrant Agent (but not including the initial Warrant Agent), whether appointed by the
Company or by such court, shall be a person organized and existing under the laws of any state of the United States of America, in good
standing, and authorized under such laws to exercise corporate trust powers and subject to supervision or examination by federal or state
authority. After appointment, any successor Warrant Agent shall be vested with all the authority, powers, rights, immunities, duties,
and obligations of its predecessor Warrant Agent with like effect as if originally named as Warrant Agent hereunder, without any further
act or deed, and except for executing and delivering documents as provided in the sentence that follows, the predecessor Warrant Agent
shall have no further duties, obligations, responsibilities or liabilities hereunder, but shall be entitled to all rights that survive
the termination of this Warrant Agreement and the resignation or removal of the Warrant Agent, including but not limited to its right
to indemnity hereunder. If for any reason it becomes necessary or appropriate or at the request of the Company, the predecessor Warrant
Agent shall execute and deliver, at the expense of the Company, an instrument transferring to such successor Warrant Agent all the authority,
powers, and rights of such predecessor Warrant Agent hereunder; and upon request of any successor Warrant Agent the Company shall make,
execute, acknowledge, and deliver any and all instruments in writing for more fully and effectually vesting in and confirming to such
successor Warrant Agent all such authority, powers, rights, immunities, duties, and obligations.


 


7.14.2. Notice of Successor
Warrant Agent. In the event a successor Warrant Agent shall be appointed, the Company shall give notice thereof to the predecessor
Warrant Agent and the transfer agent for the Common Stock not later than the effective date of any such appointment.


 


7.14.3. Merger or Consolidation
of Warrant Agent. Any person into which the Warrant Agent may be merged or converted or with which it may be consolidated or any person
resulting from any merger, conversion or consolidation to which the Warrant Agent shall be a party or any person succeeding to the shareowner
services business of the Warrant Agent or any successor Warrant Agent shall be the successor Warrant Agent under this Warrant Agreement,
without any further act or deed. For purposes of this Warrant Agreement, “person” shall mean any individual, firm, corporation,
partnership, limited liability company, joint venture, association, trust or other entity, and shall include any successor (by merger
or otherwise) thereof or thereto.


 


	 	8.	Miscellaneous Provisions.


 


8.1. Persons Having
Rights under this Warrant Agreement. Nothing in this Warrant Agreement expressed and nothing that may be implied from any of the provisions
hereof is intended, or shall be construed, to confer upon, or give to, any person or corporation other than the parties hereto any right,
remedy, or claim under or by reason of this Warrant Agreement or of any covenant, condition, stipulation, promise, or agreement hereof.


 


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8.2. Examination of
the Warrant Agreement. A copy of this Warrant Agreement shall be available at all reasonable times at the office of the Warrant Agent
designated for such purpose for inspection by any Holder. Prior to such inspection, the Warrant Agent may require any such holder to provide
reasonable evidence of its interest in the Warrants or the Pre-funded Warrants.


 


8.3. Counterparts.
This Warrant Agreement may be executed in any number of original, facsimile or electronic counterparts and each of such counterparts shall
for all purposes be deemed to be an original, and all such counterparts shall together constitute but one and the same instrument.


 


8.4. Effect of Headings.
The Section headings herein are for convenience only and are not part of this Warrant Agreement and shall not affect the interpretation
thereof.


 


	 	9.	Certain Definitions. As used herein, the following terms shall have the following meanings:


 


(a) “Trading Day” means
any day on which the Common Stock is traded on the Trading Market, or, if the Trading Market is not the principal trading market for the
Common Stock, then on the principal securities exchange or securities market in the United States on which the Common Stock are then traded,
provided that “Trading Day” shall not include any day on which the Common Stock is scheduled to trade on
such exchange or market for less than 4.5 hours or any day that the Common Stock are suspended from trading during the final hour of trading
on such exchange or market (or if such exchange or market does not designate in advance the closing time of trading on such exchange or
market, then during the hour ending at 4:00 P.M., Eastern Time).


 


(b) “Trading Market” means
NYSE American, the Nasdaq Capital Market, the Nasdaq Global Market, the Nasdaq Global Select Market or the New York Stock Exchange.


 


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IN WITNESS WHEREOF, this Warrant
Agent Agreement has been duly executed by the parties hereto as of the day and year first above written


 


	 	AVENUE THERAPEUTICS, INC.
	 	 	 
	 	By:	/s/ Alexandra MacLean
	 	Name:	Alexandra MacLean, M.D.
	 	Title:	Chief Executive Officer
	 	Address:	2 Gansevoort Street, 9th Floor
	 	 	New York, NY 10014


 


	 	VSTOCK TRANSFER, LLC
	 	 	 
	 	By:	/s/ Young D. Kim
	 	Name:	Young D. Kim
	 	Title:	Compliance Officer


 


 


 


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EXHIBIT A





GLOBAL
WARRANT


 


[See
attached.]


 


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EXHIBIT B





GLOBAL
PRE-FUNDED WARRANT


 


[See
attached.]


 


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EXHIBIT C


 


WARRANT CERTIFICATE REQUEST NOTICE


 


To: ___________ as Warrant Agent for __________
(the “Company”)


 


The undersigned Holder of Common Stock Purchase
Warrants (“Warrants”) in the form of Global Warrants issued by the Company hereby elects to receive a Warrant Certificate
evidencing the Warrants held by the Holder as specified below:


 


	1.	Name of Holder of Warrants in form of Global Warrants: _____________________________
	 	 
	2.	Name of Holder in Warrant Certificate (if different from name of Holder of Warrants in form of Global Warrants): ________________________________
	 	 
	3.	Number of Warrants in name of Holder in form of Global Warrants: ___________________
	 	 
	4.	Number of Warrants for which Warrant Certificate shall be issued: __________________
	 	 
	5.	Number of Warrants in name of Holder in form of Global Warrants after issuance of Warrant Certificate, if any: ___________
	 	 
	6.	Warrant Certificate shall be delivered to the following address:


 


______________________________


 


______________________________


 


______________________________


 


______________________________


 


The undersigned hereby acknowledges and agrees
that, in connection with this Warrant Exchange and the issuance of the Warrant Certificate, the Holder is deemed to have surrendered the
number of Warrants in form of Global Warrants in the name of the Holder equal to the number of Warrants evidenced by the Warrant Certificate.


 


[SIGNATURE
OF HOLDER]


 


Name of Investing Entity: ____________________________________________________


 


Signature of Authorized Signatory of Investing
Entity: ______________________________


 


Name of Authorized Signatory: ________________________________________________


 


Title of Authorized Signatory: _________________________________________________


 


Date: _______________________________________________________________


 


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EXHIBIT D








AUTHORIZED REPRESENTATIVES


 


	Name	 	Title	 	Signature
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 
	 	 	 	 	 


 


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