EX-4.2



 Exhibit 4.2 

WARRANT AGREEMENT 

THIS WARRANT AGREEMENT made as of
                , 2018 (the “Issuance Date”), between SELLAS Life Sciences Group, Inc., a Delaware corporation (the “Company”),
Computershare Inc., a Delaware corporation (“Computershare”), and its wholly-owned subsidiary, Computershare Trust Company, N.A., a federally chartered trust company (and together with Computershare, the “Warrant
Agent”). 
 WHEREAS, the Company has sold
                 shares of common stock, par value $0.0001 per share (the “Common Stock” and includes any share capital into which such Common Stock
shall have been changed or any share capital resulting from a reclassification of such Common Stock), of the Company and                  warrants to purchase
                 shares of Common Stock (each, a “Warrant Share” and, collectively, the “Warrant Shares”), subject to adjustment as
described herein (each, a “Warrant” and, collectively, the “Warrants”), pursuant to an Underwriting Agreement, dated                 ,
2018, between the Company and Cantor Fitzgerald & Co. and Oppenheimer & Co. Inc., as representatives of the several underwriters named therein (the “Underwriting Agreement”); 

WHEREAS, the Company has filed with the Securities and Exchange Commission a Registration Statement, No. 333-225140 on Form S-1 (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 Common Stock, the Warrants and the Common Stock issuable upon exercise of the Warrants (the “Warrant Shares”), and such Registration Statement was declared effective on
                , 2018; 
 WHEREAS, the
Company desires the Warrant Agent to act on behalf of the Company, and the Warrant Agent is willing to so act, in connection with the issuance, registration, transfer, exchange and exercise of the Warrants; 

WHEREAS, the Company desires to provide for the form and provisions of the 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 

WHEREAS, all acts and things have been done and performed which are necessary to make the Warrants, when executed on behalf of
the Company and countersigned by or on behalf of the Warrant Agent, as provided herein, 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 for the 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. 







 2.    Warrants. 

2.1    Form of Warrant. The Warrants shall be registered securities and shall be initially evidenced
by a global Warrant certificate (“Global Certificate”) in the form of Exhibit A 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. If DTC subsequently ceases to make its settlement system available for the Warrants, the Company may instruct the Warrant Agent regarding making
arrangements for book-entry settlement. In the event that the Warrants are not eligible for, or it is no longer necessary to have the Warrants available in, registration in the name of Cede & Co., a nominee of DTC, the Company may instruct
the Warrant Agent to provide written instructions to DTC to deliver to the Warrant Agent for cancellation the Global Certificate, and the Company shall instruct the Warrant Agent to deliver to each Holder (as defined below) separate certificates
evidencing Warrants (“Definitive Certificates” and, together with the Global Certificate, “Warrant Certificates”), in the form of Exhibit B to this Warrant Agreement. The Warrants represented by the
Global Certificate are referred to as “Global Warrants”. 
 2.2    Registration.

 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. Any Person in whose name ownership of a beneficial interest in the Warrants evidenced by a Global Certificate is recorded in the records
maintained by DTC or its nominee shall be deemed the “beneficial owner” thereof, provided that all such beneficial interests shall be held through a Participant (as defined below), which shall be the registered holder of such Warrants.

 2.2.2    Issuance of Warrants. Upon the initial issuance of the Warrants, the Warrant Agent
shall issue the Global Certificate and deliver the Warrants in the DTC settlement system in accordance with written instructions delivered to the Warrant Agent by the Company. Ownership of beneficial interests in the 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”), subject to a Holder’s right to elect to receive a
Warrant in certificated form in the form of Exhibit B to this Warrant Agreement. Any Holder desiring to elect to receive a Warrant in certificated form shall make such request in writing delivered to the Warrant Agent pursuant to
Section 2.2.6, and shall surrender to the Warrant Agent the interest of the Holder on the books of the Participant evidencing the Warrants which are to be represented by a Definitive Certificate through the DTC settlement system. 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. 

2.2.3    Beneficial Owner; Holder. Prior to due presentment for registration of transfer of any
Warrant, the Company and the Warrant Agent may deem and treat the person in whose name that Warrant shall be registered on the Warrant Register (the “Holder”) as the absolute owner of such Warrant 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. Notwithstanding the foregoing, nothing herein shall prevent the Company, the Warrant Agent or


  
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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. The rights of beneficial owners in a Warrant evidenced by the Global Certificate shall be exercised by the Holder or a Participant through the DTC system, except to the extent set forth herein or in the Global
Certificate. 
 2.2.4    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. 

2.2.5    Proxies. The Holder of a 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 Warrant Agreement or the Warrants; provided, however, that at
all times that Warrants are evidenced by Book Entry Warrant Certificate, exercise of those Warrants shall be effected on their behalf by Participants through DTC in accordance the procedures administered by DTC. 

2.2.6    Warrant Certificate Request. 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 Warrants for a Definitive
Certificate evidencing the same number of 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 evidenced by a Definitive Certificate, a
“Warrant Exchange”), the Warrant Agent shall, as soon as practicable, effect the Warrant Exchange and shall, as soon as practicable, issue and deliver to the Holder a Definitive Certificate for such number of Warrants in the name
set forth in the Warrant Certificate Request Notice. Such Definitive Certificate shall be dated the original issue date of the Warrants, shall be manually executed by an authorized signatory of the Company, shall be in the form attached hereto as
Exhibit B, 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 Definitive 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”).


  
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If the Company or the Warrant Agent fails for any reason to deliver to the Holder the Definitive Certificate subject to the Warrant Certificate Request Notice by the Warrant Certificate Delivery
Date, the Company shall pay to the Holder, in cash, as liquidated damages and not as a penalty, for each $1,000 of Warrant Shares evidenced by such Definitive Certificate (based on the Weighted Average Price (as defined in the Warrants) of the
Common Stock on the Warrant Certificate Request Notice Date), $10 per Business Day for each Business Day after such Warrant Certificate Delivery Date until such Definitive Certificate is delivered or, prior to delivery of such Warrant Certificate,
the Holder rescinds such Warrant Exchange. 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 Definitive Certificate and, notwithstanding
anything to the contrary set forth herein, the Definitive Certificate shall be deemed for all purposes to contain all of the terms and conditions of the Warrants evidenced by such Warrant Certificate and the terms of this Warrant Agreement, shall
not apply to the Warrants evidenced by the Definitive Certificate.    The Warrant Agent shall have no responsibility for any liquidated damages that may be payable or paid to any Person under this paragraph for any failure by the
Warrant Agent to deliver to the Holder the Definitive Certificate, on the Company’s behalf. In addition, the Company shall indemnify and hold harmless the Warrant Agent against all claims made against the Warrant Agent for any such failure
except that the Company shall not be obligated to provide any such indemnification if it is determined by a final, non-appealable judgment of a court of competent jurisdiction that such failure is due to the
Warrant Agent’s gross negligence, bad faith or willful misconduct. 
 2.3    Detachability of
Warrants. The Common Stock and the Warrants will be issued separately and will be separately transferable immediately upon issuance. 

3.    Terms and Exercise of Warrants. 

3.1    Exercise Price. The exercise price per whole share of the Common Stock under each Warrant
shall be $[●], subject to adjustment hereunder (the “Exercise Price”). 

3.2    Duration of Warrants. A Warrant may be exercised only during the period (the
“Exercise Period”) commencing on the Issuance Date and terminating at 5:00 P.M., Eastern time on the date sixty (60) months after the Initial Exercisability Date or, if such date falls on a day other than a Business Day or on
which trading does not take place on the Principal Market (a “Holiday”), the next day that is not a Holiday (the “Expiration Date”). Each Warrant not exercised on or before the Expiration Date shall become void, and
all rights thereunder and all rights in respect thereof under this Warrant Agreement shall cease at the close of business on the Expiration Date. 

3.3    Exercise of Warrants. 

3.3.1    Exercise and Payment. A registered holder may exercise a Warrant by delivering, not later
than 5:00 P.M., Eastern time, on any Business Day during the Exercise Period (the “Exercise Date”) to the Warrant Agent at its offices designated for such purpose (i) the Warrant Certificate evidencing the Warrants to be
exercised, or, in the case of a Book-Entry Warrant Certificate, the Warrants to be exercised (the “Book-Entry Warrants”) free on the records of the Depository to an account of the Warrant Agent at the Depository designated for


  
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such purpose in writing by the Warrant Agent to the Depository from time to time, and (ii) an election to purchase the Warrant Shares underlying the Warrants to be exercised (the
“Election to Purchase” and together with the Warrant Certificates and the Book-Entry Warrants, the “Warrant Exercise Documents”), properly completed and duly executed by the registered holder on the reverse of the
Warrant Certificate, accompanied by a signature guarantee and such other documentation as the Warrant Agent may reasonably request, or, in the case of a Book-Entry Warrant Certificate, properly delivered by the Participant in accordance with the
Depository’s procedures. Within one Trading Day after the Exercise Date, such holder must pay the Warrant Price for each Warrant to be exercised in lawful money of the United States of America by wire, certified or official bank check, or wire
transfer, in immediately available funds unless such holder has elected to make a cashless exercise pursuant to Section 3.3.8. The term “Warrant Price” as used in this Warrant Agreement refers to price per share of Common Stock
at which shares may be purchased at the time the Warrant is exercised. 
 If any of (A) the Warrant Certificate or the Book-Entry
Warrants, (B) the Election to Purchase, or (C) the Warrant Price therefor, is received by the Warrant Agent after 5:00 P.M., Eastern time, on the specified Exercise Date, the Warrants will be deemed to be received on the Business Day next
succeeding the Exercise Date. If the date specified as the Exercise Date is not a Business Day, the Warrants will be deemed to be received on the next succeeding day that is a Business Day. If the Warrants are received or deemed to be received after
the Expiration Date, the exercise thereof will be null and void and any funds delivered to the Warrant Agent will be returned to the registered holder or Participant, as the case may be, as soon as practicable. In no event will a registered holder
or Participant be entitled to interest accrued on funds deposited with the Warrant Agent in respect of an exercise or attempted exercise of Warrants. The Warrant Agent shall not have any responsibility or liability relating to the determination as
to the validity of any exercise of Warrants which determination will be made by the Company and the applicable registered holder, and the Warrant Agent may rely upon the instructions of the Company regarding the validity of any exercise of Warrants.
The Warrant Agent shall not have any obligation to inform a registered holder of the invalidity of any exercise of Warrants. If the Company believes that an exercise by a registered holder is invalid the Company will promptly notify such registered
holder of the such fact and the reasons why it believes the exercise was invalid and will provide a copy of such notice to the Warrant Agent as soon as practicable. 

The Warrant Agent shall forward funds received for warrant exercises in a given month by the 5th Business Day of the following
month by wire transfer to an account designated by the Company in writing. 
 All funds received by Computershare under this
Warrant Agreement that are to be distributed or applied by Computershare in the performance of services (the “Funds”) shall be held by Computershare as agent for the Company and deposited in one or more bank accounts to be
maintained by Computershare in its name as agent for the Company. Until paid pursuant to the terms of this Warrant Agreement, Computershare will hold the Funds through such accounts in: deposit accounts of commercial banks with Tier 1 capital
exceeding $1 billion or with an average rating above investment grade by Standard and Poor’s Corporation (LT Local Issuer Credit Rating), Moody’s Investors Service, Inc. (Long Term Rating) and Fitch Ratings, Inc. (LT Issuer Default
Rating) (each as reported by Bloomberg Finance L.P.). Computershare shall have no responsibility or liability for any diminution of the Funds that may result from any deposit 

  
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made by Computershare in accordance with this paragraph, including any losses resulting from a default by any bank, financial institution or other third party. Computershare may from time to time
receive interest, dividends or other earnings in connection with such deposits. Computershare shall not be obligated to pay such interest, dividends or earnings to the Company, any holder or any other Person. 

3.3.2    Issuance of Certificates. The Warrant Agent shall, within a reasonable time, advise the
Company and the Company’s transfer agent and registrar (the “Transfer Agent”) in respect of (a) the Warrant Shares issuable upon such exercise as to the number of Warrants exercised in accordance with the terms and
conditions of this Warrant Agreement, (b) the instructions of each registered holder or Participant, as the case may be, with respect to delivery of the Warrant Shares issuable upon such exercise, and the delivery of definitive Warrant
Certificates, as appropriate, evidencing the balance, if any, of the Warrants remaining after such exercise, (c) in case of a Book-Entry Warrant Certificate, the notation that shall be made to the records maintained by the Depository, its
nominee for each Book-Entry Warrant Certificate, or a Participant, as appropriate, evidencing the balance, if any, of the Warrants remaining after such exercise and (d) such other information as the Company, the Warrant Agent or such transfer
agent and registrar shall reasonably require. So long as the Holder delivers the Warrant Price (or notice of a Cashless Exercise) on or prior to the first (1st) Trading Day following the date on which the Warrant Exercise Documents have been
delivered to the Warrant Agent, then on or prior to the earlier of (i) the second (2nd) Trading Day and (ii) the number of Trading Days comprising the Standard Settlement Period, in each case following the date on which the Warrant
Exercise Documents have been delivered to the Company, or, if the Holder does not deliver the Warrant Price (or notice of a Cashless Exercise) on or prior to the first (1st) Trading Day following the date on which the Warrant Exercise Documents have
been delivered to the Warrant Agent, then on or prior to the first (1st) Trading Day following the date on which the Warrant Price (or notice of a Cashless Exercise) is delivered (such earlier date, the “Share Delivery Date”), the
Company shall cause the Warrant Agent to (X) provided that the Transfer Agent is participating in the DTC Fast Automated Securities Transfer Program, credit such aggregate number of Warrant Shares to which the Holder is entitled pursuant to
such exercise to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At Custodian system, or (Y) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program,
issue and dispatch by overnight courier to the address as specified in the Warrant Exercise Documents, a certificate, registered in the name of the Holder or its designee, for the number of Warrant Shares to which the Holder is entitled pursuant to
such exercise.. If the Warrant Agent fails for any reason to deliver to such registered holder or Participant, as the case may be, the Warrant Shares subject to an exercise notice by the Warrant Share Delivery Date, the Company shall pay to the
registered holder, in cash, as liquidated damages and not as a penalty, for each $1,000 of Warrant Shares subject to such exercise (based on the Weighted Average Price of the Common Stock on the date of the applicable exercise notice), $10 per
Trading Day (increasing to $20 per Trading Day on the fifth Trading Day after such liquidated damages begin to accrue) for each Trading Day after such Warrant Share Delivery Date until such Warrant Shares are delivered or the registered holder
rescinds such exercise. The Warrant Agent shall have no responsibility for any liquidated damages that may be payable or paid to any registered holder or Participant under this paragraph for any failure by the Warrant Agent to execute, issue and
deliver, on the Company’s behalf, the Warrant Shares as required by this paragraph. In addition, the Company shall indemnify and hold harmless the 

  
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Warrant Agent against all claims made against the Warrant Agent for any such failure except that the Company shall not be obligated to provide any such indemnification if it is determined by a
final, non-appealable judgment of a court of competent jurisdiction that such failure is due to the Warrant Agent’s gross negligence, bad faith or willful misconduct. 

If the Warrant Agent fails to comply with the preceding paragraphs in this Section 3.3.2 by the Warrant Share Delivery
Date, then, without limiting the rights and immunities of the Warrant Agent hereunder, in addition to other rights it may have hereunder, the registered holder or Participant will have the right to rescind its exercise. 

3.3.3    Valid Issuance. All shares of Common Stock issued upon the proper exercise of a Warrant in
conformity with this Warrant Agreement shall be validly issued, fully paid and nonassessable. 

3.3.4    Dividends. The accrual of dividends, if any, on the Warrant Shares issued hereunder will
be governed by the terms generally applicable to the Common Stock. From and after the issuance of such Warrant Shares, the former holder of the Warrants exercised will be entitled to the benefits generally available to other holders of Common Stock,
including the accrual of dividends, if any, on such Warrant Shares even prior to exercise of such Warrant Shares, and such former holder’s right to receive payments of dividends and any other amounts payable in respect of the Warrant Shares
shall be governed by, and shall be subject to, the terms and provisions generally applicable to the Common Stock. 

3.3.5    No Fractional Exercise. A registered holder may exercise a Warrant from time to time only
for whole shares of Common Stock. No fractional shares or scrip representing fractional shares shall be issued upon the exercise of a 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. If fewer than all of the Warrants evidenced
by a Warrant Certificate are exercised, a new Warrant Certificate for the number of unexercised Warrants remaining shall be executed by the Company and countersigned by the Warrant Agent as provided in Section 2 of this Warrant Agreement, and
delivered to the holder of the Warrant Certificate at the address specified on the books of the Warrant Agent or as otherwise specified in writing by such registered holder. If fewer than all the Warrants evidenced by a Book-Entry Warrant
Certificate are exercised, a notation shall be made to the records maintained by the Depository, its nominee for each Book-Entry Warrant Certificate, or a Participant, as appropriate, evidencing the balance of the Warrants remaining after such
exercise. Whenever a payment for fractional shares is to be made by the Warrant Agent under this Warrant Agreement, the Company shall promptly prepare and deliver to the Warrant Agent a certificate setting forth in reasonable detail the facts
related to such payments and the prices and formulas utilized in calculating such payments. The Warrant Agent shall be fully protected in relying upon such a certificate and shall have no duty with respect to, and shall not be deemed to have
knowledge of, any payment for fractional shares under this Warrant Agreement relating to the payment of fractional shares unless and until the Warrant Agent shall have received such a certificate and sufficient monies. The Company shall provide an
initial funding of one thousand dollars ($1,000) for the purpose of issuing cash in lieu of fractional shares. From time to time thereafter, the Warrant Agent may request additional funding to cover 


  
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payments for fractional Warrant Shares. The Warrant Agent shall have no obligation to make such payments for fractional Warrant Shares unless the Company shall have provided the necessary funds
to pay in full all amounts due and payable with respect thereto. Upon expiration of the term of all Warrants or the earlier exercise of all Warrants any balance remaining of such funds shall be paid to the Company. 

3.3.6    No Transfer Taxes. Issuance of Warrant Shares shall be made without charge to a registered
holder for any issue or transfer tax or other incidental expense in respect of the issuance of such Warrant Shares, all of which taxes and expenses shall be paid by the Company, and such Warrant Shares shall be issued in the name of the registered
holder or in such name or names as may be directed by the registered holder; provided, however, that in the event Warrant Shares are to be issued in a name other than the name of the registered holder, a Warrant when surrendered for exercise shall
be accompanied by the Assignment Form attached hereto duly executed by the registered holder and the Company may require, as a condition thereto, the payment of a sum sufficient to reimburse it for any transfer tax incidental thereto. The Company
shall pay all transfer agent fees required for same-day processing of any exercise notice. The Warrant Agent shall not have any duty or obligation to take any action under any section of this Warrant Agreement
that requires the payment of taxes and/or charges unless and until it is satisfied that all such payments have been made. 

3.3.7    Date of Issuance. Each person in whose name any such certificate for shares of Common
Stock is issued shall for all purposes be deemed to have become the holder of record of such shares on the date on which the Warrant was surrendered and payment of the Warrant Price was made, irrespective of the date of delivery of such certificate,
except that, if the date of such surrender and payment 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 close of business on the next succeeding date on
which the stock transfer books are open. Upon receipt by the Company of a duly executed Notice of Exercise (which may be by facsimile or email), a registered holder shall be deemed to have exercised its Warrant as specified in the Notice of Exercise
for purposes of Regulation SHO promulgated under the Securities Exchange Act of 1934, as amended. 

3.3.8    Optional Cashless Exercise. If at any time during the term of this Warrant Agreement there
is no effective registration statement registering, or no current prospectus available for, the issuance or resale of the Warrant Shares by the registered holder, then the Warrant may also be exercised, in whole or in part, at such time by means of
a “cashless exercise” in which the holder shall be entitled to receive a number of Warrant Shares determined according to the following formula (a “Cashless Exercise”):: 

Net Number = (A x B) - (A x C) 

                        
                      B 

For purposes of the foregoing formula: 

A= the total number of shares with respect to which the Warrants are then being exercised. 

  
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 B= as applicable: (i) the Closing Sale Price of the Common Stock on the
Trading Day immediately preceding the date of the applicable Exercise Notice if such Exercise Notice is (1) both executed and delivered pursuant to Section 1(a) hereof on a day that is not a Trading Day or (2) both executed and
delivered pursuant to Section 1(a) hereof on a Trading Day prior to the opening of “regular trading hours” (as defined in Rule 600(b)(64) of Regulation NMS promulgated under the federal securities laws) on such Trading Day,
(ii) at the option of the Holder, either (y) the Weighted Average Price on the Trading Day immediately preceding the date of the applicable Notice of Exercise or (z) the Bid Price of the Common Stock as of the time of the
Holder’s execution of the applicable Exercise Notice if such Exercise Notice is executed during “regular trading hours” on a Trading Day and is delivered within two (2) hours thereafter (including until two (2) hours after
the close of “regular trading hours” on a Trading Day) pursuant to Section 1(a) hereof or (iii) the Closing Sale Price of the Common Stock on the date of the applicable Exercise Notice if the date of such Exercise Notice is a
Trading Day and such Exercise Notice is both executed and delivered pursuant to Section 1(a) hereof after the close of “regular trading hours” on such Trading Day. 

C= the Exercise Price then in effect for the applicable Warrant Shares at the time of such exercise. 

If Warrant Shares are issued in such a cashless exercise, the Company acknowledges and agrees that in accordance with
Section 3(a)(9) of the Securities Act of 1933, as amended, the Warrant Shares shall take on the registered characteristics of the Warrants being exercised, and the holding period of the Warrants being exercised may be tacked on to the holding
period of the Warrant Shares. The Company agrees not to take any position contrary to this Section 3.3.8. 

3.3.9    Disputes. In the case of a dispute as to the determination of the Exercise Price or the
arithmetic calculation of the Warrant Shares, the Company shall promptly issue to the registered holder the number of Warrant Shares that are not disputed. 

3.3.10    Limitations on Exercise. Notwithstanding anything to the contrary contained herein, the
Company shall not effect the exercise of any portion of a Warrant, and the Holder shall not have the right to exercise any portion of a Warrant, pursuant to the terms and conditions of the Warrant and any such exercise shall be null and void and
treated as if never made, to the extent that after giving effect to such exercise, the Holder together with the other Attribution Parties collectively would beneficially own in excess of 4.99 (the “Maximum Percentage”) of the number
of shares of Common Stock outstanding immediately after giving effect to such exercise. For purposes of the foregoing sentence, the aggregate number of shares of Common Stock beneficially owned by the Holder and the other Attribution Parties shall
include the number of shares of Common Stock held by the Holder and all other Attribution Parties plus the number of shares of Common Stock issuable upon exercise of the Warrants with respect to which the determination of such sentence is being
made, but shall exclude the number of shares of Common Stock which would be issuable upon (A) exercise of the remaining, unexercised portion of the Warrants beneficially owned by the Holder or any of the other Attribution Parties and
(B) exercise or conversion of the unexercised or unconverted portion of any other securities of the Company (including, without limitation, any convertible notes or convertible preferred stock or warrants, including the other Warrants)
beneficially owned by the Holder or any other Attribution Party subject to a limitation on conversion or exercise analogous 

  
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to the limitation contained in this Section 3.3.10. For purposes of this Section 3.3.10, beneficial ownership shall be calculated in accordance with Section 13(d) of the Securities
Exchange Act of 1934, as amended (the “1934 Act”). For purposes of the Warrants, in determining the number of outstanding shares of Common Stock the Holder may acquire upon the exercise of the Warrants without exceeding the Maximum
Percentage, the Holder may rely on the number of outstanding shares of Common Stock as reflected in (x) the Company’s most recent Annual Report on Form 10-K, Quarterly Report on Form 10-Q and Current Reports on Form 8-K or other public filing with the Securities and Exchange Commission (the “SEC”), as the case may be, (y) a more
recent public announcement by the Company or (z) any other written notice by the Company or the Transfer Agent setting forth the number of shares of Common Stock outstanding (the “Reported Outstanding Share Number”). If the
Company receives an Exercise Notice from the Holder at a time when the actual number of outstanding shares of Common Stock is less than the Reported Outstanding Share Number, the Company shall (i) notify the Holder in writing of the number of
shares of Common Stock then outstanding and, to the extent that such Exercise Notice would otherwise cause the Holder’s beneficial ownership, as determined pursuant to this Section 3.3.10, to exceed the Maximum Percentage, the Holder must
notify the Company of a reduced number of Warrant Shares to be purchased pursuant to such Exercise Notice (the number of shares by which such purchase is reduced, the “Reduction Shares”) and (ii) as soon as reasonably
practicable, the Company shall return to the Holder any exercise price paid by the Holder for the Reduction Shares. For any reason at any time, upon the written or oral request of the Holder, the Company shall within one (1) Business Day
confirm orally and in writing or by electronic mail to the Holder the number of shares of Common Stock then outstanding. In any case, the number of outstanding shares of Common Stock shall be determined after giving effect to the conversion or
exercise of securities of the Company, including the Warrants, by the Holder and any other Attribution Party since the date as of which the Reported Outstanding Share Number was reported. In the event that the issuance of Common Stock to the Holder
upon exercise of the Warrants results in the Holder and the other Attribution Parties being deemed to beneficially own, in the aggregate, more than the Maximum Percentage of the number of outstanding shares of Common Stock (as determined under
Section 13(d) of the 1934 Act), the number of shares so issued by which the Holder’s and the other Attribution Parties’ aggregate beneficial ownership exceeds the Maximum Percentage (the “Excess Shares”) shall be
deemed null and void and shall be cancelled ab initio, and the Holder shall not have the power to vote or to transfer the Excess Shares. As soon as reasonably practicable after the issuance of the Excess Shares has been deemed null and void, the
Company shall return to the Holder the exercise price paid by the Holder for the Excess Shares. Upon delivery of a written notice to the Company, the Holder may from time to time increase or decrease the Maximum Percentage to any other percentage
not in excess of 4.99% as specified in such notice; provided that (i) any such increase in the Maximum Percentage will not be effective until the sixty-first (61st) day after such notice is
delivered to the Company and (ii) any such increase or decrease will apply only to the Holder and the other Attribution Parties and not to any other holder of Warrants that is not an Attribution Party of the Holder. For purposes of clarity, the
shares of Common Stock issuable pursuant to the terms of the Warrants in excess of the Maximum Percentage shall not be deemed to be beneficially owned by the Holder for any purpose including for purposes of Section 13(d) or Rule 16a-1(a)(1) of the 1934 Act. No prior inability to exercise the Warrants pursuant to this paragraph shall have any effect on the applicability of the provisions of this paragraph with respect to any subsequent
determination of exercisability. The provisions of this paragraph shall 

  
 10 








 
be construed and implemented in a manner otherwise than in strict conformity with the terms of this Section 3.3.10 to the extent necessary to correct this paragraph or any portion of this
paragraph which may be defective or inconsistent with the intended beneficial ownership limitation contained in this Section 3.3.10 or to make changes or supplements necessary or desirable to properly give effect to such limitation. The
limitation contained in this paragraph may not be waived and shall apply to a successor holder of the Warrants. 

3.4    Company’s Failure to Timely Deliver Securities. If either (I) the Company shall
fail for any reason or for no reason on or prior to the applicable Share Delivery Date, (x) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program, to issue to the Holder a certificate for the number of
shares of Common Stock to which the Holder is entitled and register such Common Stock on the Company’s share register or (y) if the Transfer Agent is participating in the DTC Fast Automated Securities Transfer Program, to credit the
Holder’s balance account with DTC, for such number of shares of Common Stock to which the Holder is entitled upon the Holder’s exercise of the Warrants or (II) a registration statement (which may be the Registration Statement)
covering the issuance or resale of the Warrant Shares that are the subject of the Exercise Notice (the “Exercise Notice Warrant Shares”) is not available for the issuance or resale, as applicable, of such Exercise Notice Warrant
Shares and (x) the Company fails to promptly, but in no event later than one (1) Business Day after such registration statement becomes unavailable, to so notify the Holder and (y) the Company is unable to deliver the Exercise Notice
Warrant Shares electronically without any restrictive legend by crediting such aggregate number of Exercise Notice Warrant Shares to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At Custodian
system (the event described in the immediately foregoing clause (II) is hereinafter referred to as a “Notice Failure” and, together with the event described in clause (I) above, an “Exercise Failure”),
then, in addition to all other remedies available to the Holder, if on or prior to the applicable Share Delivery Date either (I) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program, the Company shall
fail to issue and deliver a certificate to the Holder and register such shares of Common Stock on the Company’s share register or, if the Transfer Agent is participating in the DTC Fast Automated Securities Transfer Program, credit the
Holder’s balance account with DTC for the number of shares of Common Stock to which the Holder is entitled upon the Holder’s exercise hereunder or pursuant to the Company’s obligation pursuant to clause (ii) below or (II) a
Notice Failure occurs, and if on or after such Trading Day the Holder purchases (in an open market transaction or otherwise) Common Stock to deliver in satisfaction of a sale by the Holder of shares of Common Stock issuable upon such exercise that
the Holder anticipated receiving from the Company (a “Buy-In”), then the Company shall, within three (3) Trading Days after the Holder’s request and in the Holder’s discretion,
either (i) pay cash to the Holder in an amount equal to the Holder’s total purchase price (including brokerage commissions and other out-of-pocket expenses, if
any) for the shares of Common Stock so purchased (the “Buy-In Price”), at which point the Company’s obligation to deliver such certificate (and to issue such shares of Common Stock) or
credit such Holder’s balance account with DTC for such shares of Common Stock shall terminate, or (ii) promptly honor its obligation to deliver to the Holder a certificate or certificates representing such shares of Common Stock or credit
such Holder’s balance account with DTC, as applicable, and pay cash to the Holder in an amount equal to the excess (if any) of the Buy-In Price over the product of (A) such number of shares of Common
Stock, times (B) any trading price of the Common Stock selected by the Holder in writing as in effect at any time during the period 

  
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beginning on the applicable Exercise Date and ending on the applicable Share Delivery Date. Nothing shall limit the Holder’s right to pursue any other remedies available to it hereunder, at
law or in equity, including, without limitation, a decree of specific performance and/or injunctive relief with respect to the Company’s failure to timely deliver certificates representing Warrant Shares (or to electronically deliver such
Warrant Shares) upon the exercise of the Warrants as required pursuant to the terms hereof. While the Warrants are outstanding, the Company shall cause its transfer agent to participate in the DTC Fast Automated Securities Transfer Program. In
addition to the foregoing rights, (i) if the Company fails to deliver the applicable number of Warrant Shares upon an exercise pursuant to Section 1 by the applicable Share Delivery Date, then the Holder shall have the right to rescind
such exercise in whole or in part and retain and/or have the Company return, as the case may be, any portion of the Warrants that has not been exercised pursuant to such Exercise Notice; provided that the rescission of an exercise shall not affect
the Company’s obligation to make any payments that have accrued prior to the date of such notice pursuant to this Section 1(c) or otherwise, and (ii) if a registration statement (which may be the Registration Statement) covering the
issuance or resale of the Warrant Shares that are subject to an Exercise Notice is not available for the issuance or resale, as applicable, of such Exercise Notice Warrant Shares and the Holder has submitted an Exercise Notice prior to receiving
notice of the non-availability of such registration statement and the Company has not already delivered the Warrant Shares underlying such Exercise Notice electronically without any restrictive legend by
crediting such aggregate number of Warrant Shares to which the Holder is entitled pursuant to such exercise to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At Custodian system, the Holder shall
have the option, by delivery of notice to the Company, to (x) rescind such Exercise Notice in whole or in part and retain or have returned, as the case may be, any portion of the Warrants that has not been exercised pursuant to such Exercise
Notice; provided that the rescission of an Exercise Notice shall not affect the Company’s obligation to make any payments that have accrued prior to the date of such notice pursuant to this Section 3.4 or otherwise, and/or (y) switch
some or all of such Exercise Notice from a cash exercise to a Cashless Exercise. 
 3.5    Cost Basis
Information. (a) In the event of a cash exercise, the Company hereby instructs the Warrant Agent to record cost basis for newly issued shares in a manner to be subsequently communicated by the Company in writing to the Warrant Agent. 

(b)    In the event of a cashless exercise, the Company shall provide cost basis for shares
issued pursuant to a cashless exercise at the time the Company confirms the number of Warrant Shares issuable in connection with the cashless exercise to the Warrant Agent pursuant to Section 3.3.3 hereof. 

3.6    Rule 144. (a) If the Warrant Shares are issued in a cashless exercise, the Company and the
registered holder undertaking such cashless exercise acknowledge and agree that in accordance with Section 3(a)(9) of the Act, other than a change in law, the Warrant Shares take on the registered characteristics of the Warrants being
exercised. For purposes of Rule 144(d) promulgated under the Act, as in effect on the Issuance Date, it is intended that the Warrant Shares issued in a cashless exercise shall be deemed to have been acquired by the holder of the Warrant Shares, and
the holding period for the Warrant Shares shall be deemed to have commenced, on the date the Warrants being exercised were originally issued pursuant to the Underwriting Agreement. 

  
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 (b)    The Company shall, at all times prior
to the earlier to occur of (i) the date of sale or other disposition by the holders of a Warrant of or all shares of Common Stock issued on exercise of such Warrant or (ii) the expiration or earlier termination of a Warrant if a Warrant
has not been exercised in full or in part on such date, use commercially reasonable efforts to timely file all reports required under the Exchange Act and otherwise timely take all actions necessary to permit the holder of such Warrant and/or the
shares of Common Stock issued on exercise thereof to sell or otherwise dispose of such Warrant and shares pursuant to Rule 144 promulgated under the Act, provided that the foregoing shall not apply in the event of a Merger Event following which the
successor or surviving entity is not subject to the reporting requirements of the Exchange Act. If the holder of a Warrant proposes to sell Common Stock issuable upon the exercise of such Warrant in compliance with Rule 144, then, upon the holder of
the Warrant’s written request to the Company, the Company shall furnish to the holder of the Warrant, within five (5) Business Days after receipt of such request, a written statement confirming the Company’s compliance with the filing
and other requirements of such Rule 144. 
 4.    Adjustments. 

4.1    Voluntary Adjustment By Company. The Company may at any time during the term of the Warrants
reduce the then current Exercise Price to any amount and for any period of time deemed appropriate by the Board of Directors of the Company. 

4.2    Adjustment Upon Subdivision or Combination of Common Stock. If the Company at any time on or
after the Issuance Date subdivides (by any stock split, stock dividend, recapitalization or otherwise) one or more classes of its outstanding shares of Common Stock into a greater number of shares, the Exercise Price in effect immediately prior to
such subdivision will be proportionately reduced and the number of Warrant Shares will be proportionately increased. If the Company at any time on or after the Issuance Date combines (by combination, reverse stock split or otherwise) one or more
classes of its outstanding shares of Common Stock into a smaller number of shares, the Exercise Price in effect immediately prior to such combination will be proportionately increased and the number of Warrant Shares will be proportionately
decreased. Any adjustment under this Section 4.2 shall become effective at the close of business on the date the subdivision or combination becomes effective. 

4.3    Purchase Rights. In addition to any adjustments pursuant to Section 2 above, if at any
time on or after the Issuance Date and on or prior to the Expiration Date the Company grants, issues or sells any Options, Convertible Securities or rights to purchase stock, warrants, securities or other property pro rata to the record holders of
any class of Common Stock (the “Purchase Rights”), then the Holder will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the Holder could have acquired if the Holder had
held the number of shares of Common Stock acquirable upon complete exercise of the Warrants (without regard to any limitations or restrictions on exercise of the Warrants, including without limitation, the Maximum Percentage) immediately before the
date on which a record is taken for the grant, issuance or sale of such Purchase Rights, or, if no such record is taken, the date as of which the record holders of Common Stock are to be determined for the grant, issuance or sale of such Purchase
Rights (provided, however, that to the extent that the 

  
 13 








 
Holder’s right to participate in any such Purchase Right would result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, then the Holder shall not be entitled
to participate in such Purchase Right to such extent (and shall not be entitled to beneficial ownership of such Common Stock as a result of such Purchase Right (and beneficial ownership) to such extent) and such Purchase Right to such extent shall
be held in abeyance for the benefit of the Holder until such time or times as its right thereto would not result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, at which time or times the Holder shall be granted
such right (and any Purchase Right granted, issued or sold on such initial Purchase Right or on any subsequent Purchase Right to be held similarly in abeyance) to the same extent as if there had been no such limitation). 

4.4    Rights Upon Distribution of Assets. In addition to any adjustments pursuant to
Section 2 above, if, on or after the Issuance Date and on or prior to the Expiration Date, the Company shall declare or make any dividend or other distribution of its assets (or rights to acquire its assets) to holders of shares of Common
Stock, by way of return of capital or otherwise (including, without limitation, any distribution of cash, stock or other securities, property, options, evidence of indebtedness or any other assets by way of a dividend, spin off, reclassification,
corporate rearrangement, scheme of arrangement or other similar transaction) (a “Distribution”), at any time after the issuance of the Warrants, then, in each such case, the Holder shall be entitled to participate in such
Distribution to the same extent that the Holder would have participated therein if the Holder had held the number of shares of Common Stock acquirable upon complete exercise of the Warrants (without regard to any limitations or restrictions on
exercise of the Warrants, including without limitation, the Maximum Percentage) immediately before the date on which a record is taken for such Distribution, or, if no such record is taken, the date as of which the record holders of shares of Common
Stock are to be determined for the participation in such Distribution (provided, however, that to the extent that the Holder’s right to participate in any such Distribution would result in the Holder and the other Attribution
Parties exceeding the Maximum Percentage, then the Holder shall not be entitled to participate in such Distribution to such extent (and shall not be entitled to beneficial ownership of such shares of Common Stock as a result of such Distribution
(and beneficial ownership) to such extent) and the portion of such Distribution shall be held in abeyance for the benefit of the Holder until such time or times as its right thereto would not result in the Holder and the other Attribution Parties
exceeding the Maximum Percentage, at which time or times the Holder shall be granted such Distribution (and any Distributions declared or made on such initial Distribution or on any subsequent Distribution held similarly in abeyance) to the same
extent as if there had been no such limitation). 
 4.5    Fundamental Transaction. The Company
shall not enter into or be party to a Fundamental Transaction unless the Successor Entity assumes in writing all of the obligations of the Company under the Warrants in accordance with the provisions of this Section 4(b), including agreements
to deliver to the Holder in exchange for the Warrants a security of the Successor Entity evidenced by a written instrument substantially similar in form and substance to the Warrants, including, without limitation, which is exercisable for a
corresponding number of shares of capital stock equivalent to the shares of Common Stock acquirable and receivable upon exercise of the Warrants (without regard to any limitations on the exercise of the Warrants) prior to such Fundamental
Transaction, and with an exercise price which applies the exercise price hereunder to such shares of capital stock (but taking into account the relative value of the shares 

  
 14 








 
of Common Stock pursuant to such Fundamental Transaction and the value of such shares of capital stock, such adjustments to the number of shares of capital stock and such exercise price being for
the purpose of protecting the economic value of the Warrants immediately prior to the consummation of such Fundamental Transaction). Upon the consummation of each Fundamental Transaction, the Successor Entity shall succeed to, and be substituted for
the Company (so that from and after the date of the applicable Fundamental Transaction, the provisions of the Warrants and the other Transaction Documents referring to the “Company” shall refer instead to the Successor Entity), and may
exercise every right and power of the Company and shall assume all of the obligations of the Company under the Warrants with the same effect as if such Successor Entity had been named as the Company herein. Upon consummation of each Fundamental
Transaction, the Successor Entity shall deliver to the Holder confirmation that there shall be issued upon exercise of the Warrants at any time after the consummation of the applicable Fundamental Transaction, in lieu of the shares of Common Stock
(or other securities, cash, assets or other property (except such items still issuable under Sections 4.3 and 4.4 above, which shall continue to be receivable thereafter)) issuable upon the exercise of the Warrants prior to the applicable
Fundamental Transaction, such shares of common stock (or its equivalent) of the Successor Entity (including its Parent Entity) which the Holder would have been entitled to receive upon the happening of the applicable Fundamental Transaction had the
Warrants been exercised immediately prior to the applicable Fundamental Transaction (without regard to any limitations on the exercise of the Warrants), as adjusted in accordance with the provisions of the Warrants. Notwithstanding the foregoing,
and without limiting Section 3.3.10 hereof, the Holder may elect, at its sole option, by delivery of written notice to the Company to waive this Section 4.4 to permit the Fundamental Transaction without the assumption of the Warrants. In
addition to and not in substitution for any other rights hereunder, prior to the consummation of each Fundamental Transaction pursuant to which holders of shares of Common Stock are entitled to receive securities or other assets with respect to or
in exchange for shares of Common Stock (a “Corporate Event”), the Company shall make appropriate provision to insure that the Holder will thereafter have the right to receive upon an exercise of the Warrants at any time after the
consummation of the applicable Fundamental Transaction but prior to the Expiration Date, in lieu of the shares of the Common Stock (or other securities, cash, assets or other property (except such items still issuable under Sections 4.3 and 4.4
above, which shall continue to be receivable thereafter)) issuable upon the exercise of the Warrant prior to such Fundamental Transaction, such shares of stock, securities, cash, assets or any other property whatsoever (including warrants or other
purchase or subscription rights) (collectively, the “Corporate Event Consideration”) which the Holder would have been entitled to receive upon the happening of the applicable Fundamental Transaction had the Warrants been exercised
immediately prior to the applicable Fundamental Transaction (without regard to any limitations on the exercise of the Warrants). The provision made pursuant to the preceding sentence shall be in a form and substance reasonably satisfactory to the
Holder. The provisions of this Section 4.5 shall apply similarly and equally to successive Fundamental Transactions and Corporate Events. Notwithstanding the foregoing, in the event of a Change of Control that is approved by the Company’s
Board of Directors (and not for avoidance of doubt if the Chang of Control is not within the Company’s control), the Holder shall be entitled to receive from the Company or any Successor Entity, as of the date of consummation of such Change of
Control, the same type or form of consideration (and in the same proportion), at the Black Scholes Value of the unexercised portion of the Warrants, that is being offered and paid to the holders of 

  
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Common Stock of the Company in connection with the Change of Control, whether that consideration be in the form of cash, stock or any combination thereof, or whether the holders of Common Stock
are given the choice to receive from among alternative forms of consideration in connection with the Change of Control. 

4.6    Voluntary Adjustment By the Company. The Company may at any time during the term of the
Warrants reduce the then current Exercise Price to any amount and for any period of time deemed appropriate by the Board of Directors of the Company. 

4.7    Notices. 

4.7.1    Adjustment to Exercise Price. Whenever the Exercise Price is adjusted pursuant to any
provision of this Section 4, the Company shall give prompt written notice thereof to the Warrant Agent, which notice shall set forth the Exercise Price after such adjustment and set forth a brief statement of the facts requiring such
adjustment. The Company agrees that it will provide the Warrant Agent with any new or amended exercise terms. The Warrant Agent shall have no obligation under any Section of this Warrant Agreement to determine whether an adjustment made hereunder
has occurred or are scheduled or contemplated to occur or to calculate any of the adjustments set forth in this Warrant Agreement. 

4.7.2    Notices of Certain Events to Allow Exercise. If (A) the Company shall declare a
dividend (or any other distribution in whatever form) on the Common Stock, (B) the Company shall declare a special nonrecurring cash dividend on or a redemption of the Common Stock, (C) the Company shall authorize the granting to all
holders of the Common Stock rights or warrants to subscribe for or purchase any shares of capital stock of any class or of any rights, (D) the approval of any stockholders of the Company shall be required in connection with any reclassification
of the Common Stock, any consolidation or merger to which the Company is a party, any sale or transfer of all or substantially all of the assets of the Company, or any compulsory share exchange whereby the Common Stock is converted into other
securities, cash or property, or (E) the Company shall authorize the voluntary or involuntary dissolution, liquidation or winding up of the affairs of the Company, then, in each case, the Company shall cause to be mailed to each registered
holder at its last address as it shall appear upon the Warrant Register of the Company, at least 20 calendar days prior to the applicable record or effective date hereinafter specified, a notice stating (x) the date on which a record is to be
taken for the purpose of such dividend, distribution, redemption, rights or warrants, or if a record is not to be taken, the date as of which the holders of the Common Stock of record to be entitled to such dividend, distributions, redemption,
rights or warrants are to be determined or (y) the date on which such reclassification, consolidation, merger, sale, transfer or share exchange is expected to become effective or close, and the date as of which it is expected that holders of
the Common Stock of record shall be entitled to exchange their shares of the Common Stock for securities, cash or other property deliverable upon such reclassification, consolidation, merger, sale, transfer or share exchange; provided that the
failure to mail such notice or any defect therein or in the mailing thereof shall not affect the validity of the corporate action required to be specified in such notice. To the extent that any notice provided hereunder constitutes, or contains,
material, non-public information regarding the Company or any of the subsidiaries, the Company shall simultaneously file such notice with the Commission pursuant to a Current Report on Form 8-K. The registered holder shall remain entitled to exercise a Warrant during the period commencing on the date of such notice to the effective date of the event triggering such notice except as may otherwise be
expressly set forth herein. 

  
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 4.8    Form of Warrant. The form of Warrant need not
be changed because of any adjustment pursuant to this Section 4, and Warrants issued after such adjustment may state the same Warrant Price and the same number of shares as is stated in the Warrants initially issued pursuant to this Warrant
Agreement. 
 4.9    Calculations. All calculations under this Section 4 shall be made to
the nearest cent or the nearest 1/100th of a share, as the case may be. For purposes of this Section 4, the number of shares of Common Stock deemed to be issued and outstanding as of a given date shall be the sum of the number of shares of
Common Stock (excluding treasury shares, if any) issued and outstanding. 
 5.    Transfer and
Exchange of Warrants. 
 5.1    Registration of Transfer. The Warrant Agent shall register the
transfer, from time to time, of any outstanding Warrant upon the Warrant Register, upon surrender of such Warrant for transfer, duly endorsed with signatures properly guaranteed and accompanied by appropriate instructions for transfer. Upon any such
transfer, a new Warrant representing an equal aggregate number of Warrants shall be issued and the old Warrant shall be cancelled by the Warrant Agent. The Warrants so cancelled shall be delivered by the Warrant Agent to the Company from time to
time upon the request and at the expense of the Company. 
 5.2    Procedure for Surrender of
Warrants. Warrants may be surrendered to the Warrant Agent, together with a written request for exchange or transfer, and thereupon the Warrant Agent shall issue in exchange therefor one or more new Warrants as requested by the registered holder
of the Warrants so surrendered, representing an equal aggregate number of Warrants; provided, however, that except as otherwise provided herein or in any Book-Entry Warrant Certificate, each Book-Entry Warrant Certificate may be transferred only in
whole and only to the Depository, to another nominee of the Depository, to a successor depository, or to a nominee of a successor depository; provided further, however, that in the event that a Warrant surrendered for transfer bears a restrictive
legend, the Warrant Agent shall not cancel such Warrant and issue new Warrants in exchange therefor until the Warrant Agent has received an opinion of counsel for the Company stating that such transfer may be made and indicating whether the new
Warrants or Warrant Shares must also bear a restrictive legend. Upon any such registration of transfer, the Company shall execute, and the Warrant Agent shall countersign and deliver, in the name of the designated transferee a new Warrant
Certificate or Warrant Certificates of any authorized denomination evidencing in the aggregate a like number of unexercised Warrants. 

A party requesting transfer of Warrants must provide any evidence of authority that may be required by the Warrant Agent,
including but not limited to, a signature guarantee from an eligible guarantor institution participating in a signature guarantee program approved by the Securities Transfer Association. 

  
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 5.3    Fractional Warrants. The Warrant Agent shall
not be required to effect any registration of transfer or exchange which will result in the issuance of a warrant certificate for a fraction of a warrant. 

5.4    Service Charges. A registered holder shall not incur any service charge for any exchange or
registration of transfer of Warrants. 
 5.5    Warrant Execution and Countersignature. The
Warrant Agent is hereby authorized to countersign and to deliver, in accordance with the terms of this Warrant Agreement, the Warrants required to be issued pursuant to the provisions of this Section 5, and the Company, whenever required by the
Warrant Agent, will supply the Warrant Agent with Warrants duly executed on behalf of the Company for such purpose. 

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

6.1    No Rights as Stockholder. Except as otherwise specifically provided herein, a registered
holder, solely in its capacity as a holder of a Warrant, 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 registered holder, solely in its capacity as the registered holder of a Warrant, 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 stock, consolidation, merger, conveyance or otherwise), receive notice of meetings, receive dividends or subscription rights, or otherwise, prior to the issuance to the registered holder of the Warrant Shares
which it is then entitled to receive upon the due exercise of a Warrant. In addition, nothing contained in this Warrant Agreement shall be construed as imposing any liabilities on a registered holder to purchase any securities (upon exercise of a
Warrant or otherwise) or as a stockholder of the Company, whether such liabilities are asserted by the Company or by creditors of the Company. A Warrant does not entitle the registered holder thereof to any of the rights of a stockholder. 

6.2    Lost, Stolen or Destroyed Warrants. The Warrant Agent shall issue replacement Warrants in a
form mutually agreed to by Warrant Agent and the Company for those certificates alleged to have been lost, stolen or destroyed, upon receipt by Warrant Agent of an open penalty surety bond satisfactory to it and holding it and Company harmless and,
at the Company’s or the Rights Agent’s request, reimbursement to the Company and the Warrant Agent of all reasonable expenses incidental thereto, absent notice to Warrant Agent that such certificates have been acquired by a bona fide
purchaser. Warrant Agent may, at its option, issue replacement Warrants for mutilated certificates upon presentation thereof without such indemnity. 

6.3    Authorized Shares. The Company covenants that, during the period the Warrants are
outstanding, the Company shall at all times keep reserved for issuance under the Warrants a number of shares of Common Stock at least equal to 100% of the maximum number of shares of Common Stock as shall be necessary to satisfy the Company’s
obligation to issue shares of Common Stock under the Warrants then outstanding (without regard to any limitations on exercise) (the “Required Reserve Amount”); provided that at no time shall the number of shares of Common
Stock reserved pursuant to this Section 6.3 be reduced other than in connection with any exercise of Warrants or such other event covered by Section 4.2. The 

  
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Required Reserve Amount (including, without limitation, each increase in the number of shares so reserved) shall be allocated pro rata among the holders of the Warrants based on the number of
shares of Common Stock issuable upon exercise of Warrants held by each holder thereof on the Issuance Date (without regard to any limitations on exercise) (the “Authorized Share Allocation”). In the event that a holder shall sell or
otherwise transfer any of such holder’s Warrants, each transferee shall be allocated a pro rata portion of such holder’s Authorized Share Allocation. Any shares of Common Stock reserved and allocated to any Person which ceases to hold any
Warrants shall be allocated to the remaining holders of Warrants, pro rata based on the number of shares of Common Stock issuable upon exercise of the Warrants then held by such holders thereof (without regard to any limitations on exercise). If at
any time while the Warrants remains outstanding the Company does not have a sufficient number of authorized and unreserved shares of Common Stock to satisfy its obligation to reserve for issuance the Required Reserve Amount (an “Authorized
Share Failure”), then the Company shall promptly take all action reasonably necessary to increase the Company’s authorized shares of Common Stock to an amount sufficient to allow the Company to reserve the Required Reserve Amount for
the Warrants then outstanding. Without limiting the generality of the foregoing sentence, as soon as practicable after the date of the occurrence of an Authorized Share Failure, but in no event later than ninety (90) days after the occurrence
of such Authorized Share Failure, the Company shall hold a meeting of its stockholders for the approval of an increase in the number of authorized shares of Common Stock. In connection with such meeting, the Company shall provide each stockholder
with a proxy statement and shall use its reasonable best efforts to solicit its stockholders’ approval of such increase in authorized shares of Common Stock and to cause its board of directors to recommend to the stockholders that they approve
such proposal. Notwithstanding the foregoing, if any such time of an Authorized Share Failure, the Company is able to obtain the written consent of a majority of the shares of its issued and outstanding shares of Common Stock to approve the increase
in the number of authorized shares of Common Stock, the Company may satisfy this obligation by obtaining such consent and submitting for filing with the SEC an Information Statement on Schedule 14C. 

6.4    NONCIRCUMVENTION. The Company hereby covenants and agrees that the Company will not, by
amendment of its Certificate of Incorporation or Bylaws, or through any reorganization, transfer of assets, consolidation, merger, scheme of arrangement, dissolution, issuance or sale of securities, or any other voluntary action, avoid or seek to
avoid the observance or performance of any of the terms of the Warrants, and will at all times in good faith carry out all of the provisions of the Warrants and take all action as may be required to protect the rights of the Holder. Without limiting
the generality of the foregoing, the Company (i) shall not increase the par value of any shares of Common Stock receivable upon the exercise of the Warrants above the Exercise Price then in effect, (ii) shall take all such actions as may
be necessary or appropriate in order that the Company may validly and legally issue fully paid and nonassessable shares of Common Stock upon the exercise of the Warrants, and (iii) shall, so long as any of the Warrants are outstanding, take all
action necessary to reserve and keep available out of its authorized and unissued shares of Common Stock, solely for the purpose of effecting the exercise of the Warrants, the number of shares of Common Stock as shall from time to time be necessary
to effect the exercise of the Warrants then outstanding (without regard to any limitations on exercise). 

  
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 7.    Concerning the Warrant Agent and Other Matters.

 7.1    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, transfer or delivery of shares of Common Stock upon the exercise of Warrants, but the Company or the Warrant Agent shall not be obligated to pay any transfer taxes
or charges in respect of the Warrants or such shares in connection with a transfer to a different holder. The Warrant Agent shall not register any transfer or issue or deliver any Warrant Certificate(s) 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 transfer tax and charges, if any, or shall have established to the reasonable satisfaction of the Company and the Warrant Agent that such
transfer tax and charges, if any, have been paid. 
 7.2    Resignation, Consolidation, or Merger of
Warrant Agent. 
 7.2.1    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 pursuant to the notice provisions in
Section 8.2 hereof. In the event the transfer agency relationship, if any, in effect between the Company and the Warrant Agent terminates, the Warrant Agent will be deemed to have resigned automatically and be discharged from its duties under
this Warrant Agreement as of the effective date of such termination. If the office of the Warrant Agent becomes vacant by resignation 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 or by the holder of the Warrant (who shall, with such notice,
submit his Warrant for inspection by the Company), then the holder of any Warrant may apply to the Supreme Court of the State of New York for the County of New York for the appointment of a successor Warrant Agent at the Company’s cost. Any
successor Warrant Agent, whether appointed by the Company or by such court, shall be authorized under applicable laws to exercise the powers of a transfer agent and subject to supervision or examination by federal or state authorities. 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; but if for any reason it becomes necessary or appropriate, 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. 

7.2.2    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. 

  
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 7.2.3    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
business of the Warrant Agent, shall be the successor Warrant Agent under this Warrant Agreement without any further act by the parties. 

7.3    Fees and Expenses of Warrant Agent. 

7.3.1    Remuneration. The Company agrees to pay the Warrant Agent reasonable remuneration for its
services as such Warrant Agent hereunder in accordance with a fee schedule to be mutually agreed upon and will reimburse the Warrant Agent upon demand for all expenditures (including the reasonable expenses and fees of counsel) and disbursements
that the Warrant Agent may reasonably incur in the incurred in the preparation, delivery, negotiation, amendment, administration and execution of this Warrant Agreement and the exercise and performance of its duties hereunder. 

7.3.2    Further Assurances. The Company shall perform, acknowledge and deliver or cause to be
performed, acknowledged and delivered all such further and other acts, documents, instruments and assurances as may be reasonably required by the Warrant Agent for the carrying out or performing by the Warrant Agent of the provisions of this Warrant
Agreement. 
 7.4    Liability of Warrant Agent. 

7.4.1    Reliance on Company Statement. Whenever in the performance of its duties under this Warrant
Agreement, the Warrant Agent shall deem it necessary or desirable that any fact or matter be proved or established by the Company prior to taking or suffering any action hereunder, such fact or matter (unless other evidence in respect thereof be
herein specifically prescribed) may be deemed to be conclusively proved and established by a statement signed by the Chief Executive Officer, Chief Financial Officer, President or Chairman of the Board of Directors of the Company and delivered to
the Warrant Agent. The Warrant Agent may rely upon, and be held harmless for such reliance, such statement for any action taken or suffered by it pursuant to the provisions of this Warrant Agreement, and shall not be held liable in connection with
any delay in receiving such statement. 
 7.4.2    Indemnification. The Company covenants and
agrees to indemnify and to hold the Warrant Agent harmless against any costs, expenses (including reasonable fees of its legal counsel), losses or damages, which may be paid, incurred or suffered by or to which it may become subject, arising from or
out of, directly or indirectly, any claims or liability resulting from its actions or omissions as Warrant Agent pursuant hereto; provided, that such covenant and agreement does not extend to, and the Warrant Agent shall not be indemnified with
respect to, such costs, expenses, losses and damages incurred or suffered by the Warrant Agent as a result of, or arising out of, its gross negligence, bad faith, or willful misconduct (each as determined in a final,
non-appealable judgment of a court of competent jurisdiction). 

7.4.3    Instructions. From time to time, the Company may provide the Warrant Agent with
instructions concerning the services performed by the Warrant Agent hereunder. In addition, at any time the Warrant Agent may apply to any officer of the Company for instruction, and may consult with legal counsel for Warrant Agent or the Company
with respect to any 

  
 21 








 
matter arising in connection with the services to be performed by the Warrant Agent under this Warrant Agreement. The Warrant Agent and its agents and subcontractors shall not be liable and shall
be indemnified by the Company for any action taken or omitted by the Warrant Agent in reliance upon any Company instructions or upon the advice or opinion of such counsel. The Warrant Agent shall not be held to have notice of any change of authority
of any person, until receipt of written notice thereof from the Company. 
 7.4.4    Exclusions.
The Warrant Agent shall have no responsibility with respect to the validity of this Warrant Agreement or with respect to the validity or execution of any Warrant (except its countersignature thereof); nor shall it be responsible for any breach by
the Company of any covenant or condition contained in this Warrant Agreement or in any Warrant; nor shall it be responsible to make calculations under Section 3.3.8 or any adjustments required under the provisions of Section 4 hereof or
responsible for the manner, method, or amount of any such adjustment or the ascertaining of the existence of facts that would require any such adjustment; nor shall it by any act hereunder be deemed to make any representation or warranty as to the
authorization or reservation of any shares of Common Stock to be issued pursuant to this Warrant Agreement or any Warrant or as to whether any shares of Common Stock will when issued be valid and fully paid and nonassessable. 

7.4.5    Rights and Duties of Warrant Agent. (a) The Warrant Agent may consult with legal
counsel (who may be legal counsel for the Company), and the opinion or advice of such counsel shall be full and complete authorization and protection to the Warrant Agent as to any action taken or omitted by it in accordance with such opinion or
advice. 
 (b)    The Warrant Agent shall not be liable for or by reason of any of the
statements of fact or recitals contained in this Warrant Agreement or in the Warrant Certificates (except its countersignature thereof) or be required to verify the same, and all such statements and recitals are and shall be deemed to have been made
by the Company only. 
 (c)    The Warrant Agent shall not have any duty or
responsibility in the case of the receipt of any written demand from any holder of Warrants with respect to any action or default by the Company, including, without limiting the generality of the foregoing, any duty or responsibility to initiate or
attempt to initiate any proceedings at law or otherwise or to make any demand upon the Company. 

(d)    The Warrant Agent and any stockholder, director, officer or employee of the Warrant
Agent may buy, sell or deal in any of the Warrants or other securities of the Company or become pecuniarily interested in any transaction in which the Company may be interested, or contract with or lend money to the Company or otherwise act as fully
and freely as though it were not Warrant Agent under this Warrant Agreement. Nothing herein shall preclude the Warrant Agent from acting in any other capacity for the Company or for any other legal entity. 

(e)    The Warrant Agent may execute and exercise any of the rights or powers hereby vested
in it or perform any duty hereunder either itself or by or through its attorney or agents, and the Warrant Agent shall not be answerable or accountable for any 

  
 22 








 
act, default, neglect or misconduct of any such attorney or agents or for any loss to the Company resulting from any such act, default, neglect or misconduct, absent gross negligence, bad faith
or willful misconduct (each as determined by a final judgment of a court of competent jurisdiction) in the selection and continued employment thereof. 

(f)    The Warrant Agent may rely on and shall be held harmless and protected and shall
incur no liability for or in respect of any action taken, suffered or omitted to be taken by it in reliance upon any certificate, statement, instrument, opinion, notice, letter, facsimile transmission, telegram or other document, or any security
delivered to it, and believed by it to be genuine and to have been made or signed by the proper party or parties, or upon any written or oral instructions or statements from the Company with respect to any matter relating to its acting as Warrant
Agent hereunder. 
 (g)    The Warrant Agent shall not be obligated to expend or risk its
own funds or to take any action that it believes would expose or subject it to expense or liability or to a risk of incurring expense or liability, unless it has been furnished with assurances of repayment or indemnity satisfactory to it. 

(h)    The Warrant Agent shall not be liable or responsible for any failure of the Company
to comply with any of its obligations relating to any registration statement filed with the Commission or this Warrant Agreement, including without limitation obligations under applicable regulation or law. 

(i)    The Warrant Agent shall not be accountable or under any duty or responsibility for
the use by the Company of any Warrants authenticated by the Warrant Agent and delivered by it to the Company pursuant to this Warrant Agreement or for the application by the Company of the proceeds of the issue and sale, or exercise, of the
Warrants. 
 (j)    The Warrant Agent shall act hereunder solely as agent for the
Company, and its duties shall be determined solely by the express provisions hereof (and no duties or obligations shall be inferred or implied). The Warrant Agent shall not assume any obligations or relationship of agency or trust with any of the
owners or holders of the Warrants. 
 (k)    The Warrant Agent may rely on and be fully
authorized and protected in acting or failing to act upon (a) any guaranty of signature by an “eligible guarantor institution” that is a member or participant in the Securities Transfer Agents Medallion Program or other comparable
“signature guarantee program” or insurance program in addition to, or in substitution for, the foregoing; or (b) any law, act, regulation or any interpretation of the same even though such law, act, or regulation may thereafter have
been altered, changed, amended or repealed. 
 (l)    In the event the Warrant Agent
believes any ambiguity or uncertainty exists hereunder or in any notice, instruction, direction, request or other communication, paper or document received by the Warrant Agent hereunder, the Warrant Agent, may, in its sole discretion, refrain from
taking any action, and shall be 

  
 23 








 
fully protected and shall not be liable in any way to Company, the holder of any Warrant Certificate or Book-Entry Warrant Certificate or any other person or entity for refraining from taking
such action, unless the Warrant Agent receives written instructions signed by the Company which eliminates such ambiguity or uncertainty to the satisfaction of Warrant Agent. The foregoing shall not eliminate any liability that the Company may have
to any registered holder or holder of any Warrant Certificate or Book-Entry Warrant Certificate. 

7.5    Limitation on Liability of Warrant Agent. Notwithstanding anything contained herein to the
contrary, the Warrant Agent’s aggregate liability during any term of this Warrant Agreement with respect to, arising from, or arising in connection with this Warrant Agreement, or from all services provided or omitted to be provided under this
Warrant Agreement, whether in contract, or in tort, or otherwise, is limited to, and shall not exceed, the amounts paid hereunder by the Company to Warrant Agent as fees and charges, but not including reimbursable expenses, during the twelve
(12) months immediately preceding the event for which recovery from Warrant Agent is being sought. Sections 7.1, 7.3, 7.4, 7.5 and 8.15 shall survive the expiration of the Warrants, the termination of this Warrant Agreement and the resignation,
replacement or removal of the Warrant Agent. The costs and expenses incurred in enforcing this right of indemnification shall be paid by the Company. 

7.6    Acceptance of Agency. The Warrant Agent hereby accepts the agency established by this
Warrant Agreement and agrees to perform the same upon the terms and conditions herein set forth and among other things, shall account promptly to the Company with respect to Warrants exercised and concurrently account for, and pay to the Company,
all moneys received by the Warrant Agent for the purchase of shares of Common Stock through the exercise of Warrants. 

7.7    Opinion of Counsel. The Company shall provide an opinion of counsel prior to the Issuance
Date to set up a reserve of Warrants and related Common Stock. The opinion shall state that all Warrants or Common Stock, as applicable, are: 

(1)    registered under the Act, or are exempt from such registration, and all appropriate
state securities law filings have been made with respect to the warrants or shares; and 

(2)    validly issued, fully paid and
non-assessable. 
 8.    Miscellaneous Provisions. 

8.1    Successors. Subject to applicable securities laws, this Warrant Agreement and the Warrants
and the rights and obligations evidenced hereby shall inure to the benefit of and be binding upon the successors and permitted assigns of the Company and the successors and permitted assigns of each registered holder. The provisions of this Warrant
Agreement are intended to be for the benefit of any holder from time to time of this Warrant Agreement and shall be enforceable by the holder or holder of Warrant Shares. 

  
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 8.2    Notices. Any notice, statement or demand
authorized by this Warrant Agreement to be given or made by the Warrant Agent or by the holder of any Warrant to or on the Company shall be in writing and delivered by hand or sent by registered or certified mail or overnight courier service
addressed (until another address is filed in writing by the Company with the Warrant Agent), or by facsimile transmission (as long as the sender maintains a fax delivery report confirming receipt by the recipient and is considered delivered when
sent or if after normal business hours the next Business Day) or by email (as long as no bounce back is received by the sender), as follows: 

SELLAS Life Sciences Group, Inc. 

315 Madison Avenue, 4th Floor 

New York, NY 10017 
 Attn: Gene
Mack 
 Any notice, statement or demand authorized by this Warrant Agreement to be given or made by the holder of any Warrant or by the
Company to or on the Warrant Agent shall be in writing and delivered by hand or overnight courier service addressed (until another address is filed in writing by the Warrant Agent with the Company) as follows: 

Computershare Inc. 

Computershare Trust Company, N.A. 

250 Royall Street 
 Canton, MA
02021 
 Attn: Client Services 

8.3    Jurisdiction. The validity, interpretation, and performance of this Warrant Agreement and of
the Warrants shall be governed in all respects by the laws of the State of New York, without giving effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. The Company hereby agrees
that any action, proceeding or claim against it arising out of or relating in any way to this Warrant Agreement shall be brought and enforced in the courts of the State of New York or the United States District Court for the Southern District of New
York, and irrevocably submits to such jurisdiction, which jurisdiction shall be exclusive. The Company hereby waives any objection to such exclusive jurisdiction and that such courts represent an inconvenience forum. Any such process or summons to
be served upon the Company may be served by transmitting a copy thereof by registered or certified mail, return receipt requested, postage prepaid, addressed to it at the address set forth in Section 8.2 hereof. Such mailing shall be deemed
personal service and shall be legal and binding upon the Company in any action, proceeding or claim. 

8.4    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 and the registered holders of the Warrants, any
right, remedy, or claim under or by reason of this Warrant Agreement or of any covenant, condition, stipulation, promise, or agreement hereof. All covenants, conditions, stipulations, promises, and agreements contained in this Warrant Agreement
shall be for the sole and exclusive benefit of the parties hereto and their successors and assigns and of the registered holders of the Warrants. 

  
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 8.5    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, for inspection by the registered holder of any Warrant. The Warrant Agent may require any such holder to submit his Warrant for inspection by it.

 8.6    Counterparts. This Warrant Agreement may be executed in any number of original or
facsimile 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. A signature to this Warrant Agreement transmitted
electronically shall have the same authority, effect, and enforceability as an original signature. 

8.7    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. 
 8.8    Amendments. All
modifications or amendments, including any amendment to increase the Warrant Price or shorten the Exercise Period, shall require the written consent of the registered holders of Warrants equal to at least 67% of the Warrant Shares issuable upon
exercise of all then outstanding Warrants. As a condition precedent to the Warrant Agent’s execution of any amendment, the Company shall deliver to the Warrant Agent a certificate from an Authorized Officer that states that the proposed
amendment is in compliance with the terms of this Section 8.8. No consideration shall be offered or paid to any person to amend or consent to a waiver or modification of any provision of this Warrant Agreement unless the same consideration is
also offered to all holders of the Warrants. Notwithstanding anything in this Warrant Agreement to the contrary, the Warrant Agent shall not be required to execute any supplement or amendment to this Warrant Agreement that it has determined would
adversely affect its own rights, duties, obligations or immunities under this Warrant Agreement. No supplement or amendment to this Warrant Agreement shall be effective unless duly executed by the Warrant Agent. 

8.9    Severability. Wherever possible, each provision of this Warrant Agreement shall be
interpreted in such manner as to be effective and valid under applicable law, but if any provision of this Warrant Agreement shall be prohibited by or invalid under applicable law, such provision shall be ineffective to the extent of such
prohibition or invalidity, without invalidating the remainder of such provisions or the remaining provisions of this Warrant Agreement; provided, however, that if such prohibited and invalid provision shall adversely affect the rights, immunities,
liabilities, duties or obligations of the Warrant Agent, the Warrant Agent shall be entitled to resign immediately upon written notice to the Company. 

8.10    Restrictions. Each registered holder acknowledges that the Warrant Shares acquired upon the
exercise of a Warrant, if not registered, and the registered holder does not utilize cashless exercise, will have restrictions upon resale imposed by state and federal securities laws. 

8.11    Nonwaiver and Expenses. No course of dealing or any delay or failure to exercise any right
hereunder on the part of a registered holder shall operate as a waiver of such right or otherwise prejudice such a registered holder’s rights, powers or remedies. Without limiting any other provision of this Warrant Agreement or the
Underwriting Agreement, if the Company 

  
 26 








 
willfully and knowingly fails to comply with any provision of this Warrant Agreement or the Warrants, which results in any material damages to a registered holder, the Company shall pay such
registered holder such amounts as shall be sufficient to cover any costs and expenses including, but not limited to, reasonable attorneys’ fees, including those of appellate proceedings, incurred by the registered holder in collecting any
amounts due pursuant hereto or in otherwise enforcing any of its rights, powers or remedies hereunder. 

8.12    Limitation of Liability. No provision hereof, in the absence of any affirmative action by
the registered holder to exercise a Warrant to purchase Warrant Shares, and no enumeration herein of the rights or privileges of a registered holder, shall give rise to any liability of each registered holder for the purchase price of any Common
Stock or as a stockholder of the Company, whether such liability is asserted by the Company or by creditors of the Company. 

8.13    Remedies. The registered holders, in addition to being entitled to exercise all rights
granted by law, including recovery of damages, will be entitled to specific performance of its rights under this Warrant Agreement. The Company agrees that monetary damages would not be adequate compensation for any loss incurred by reason of a
breach by it of the provisions of this Warrant Agreement and hereby agrees to waive and not to assert the defense in any action for specific performance that a remedy at law would be adequate. Notwithstanding the foregoing or anything else herein to
the contrary, other than as expressly provided in Section 3.3.2, Section 3.4 or Section 4.5 hereof, if the Company is for any reason unable to issue and deliver Warrant Shares upon exercise of this Warrant as required pursuant to the
terms hereof, the Company shall have no obligation to pay to the holder any cash or other consideration or otherwise “net cash settle” this Warrant; provided that the foregoing shall not limit or supersede the applicability of
Section 4.5 hereof. 
 8.14    Confidentiality. The Warrant Agent and the Company agree that
all books, records, information and data pertaining to the business of the other party, including inter alia, personal, non-public warrant holder information, which are exchanged or received pursuant to the
negotiation or the carrying out of this Warrant Agreement including the fees for services set forth in a mutually agreed upon schedule shall remain confidential, and shall not be voluntarily disclosed to any other person, except as may be required
by law, including, without limitation, pursuant to subpoenas from state or federal government authorities (e.g., in divorce and criminal actions). 

8.15    Consequential Damages. Neither party to this Warrant Agreement shall be liable to the other
party for any consequential, indirect, special or incidental damages under any provisions of this Warrant Agreement or for any consequential, indirect, punitive, special or incidental damages arising out of any act or failure to act hereunder even
if that party has been advised of or has foreseen the possibility of such damages. 
 8.16    Force
Majeure. Notwithstanding anything to the contrary contained herein, the Warrant Agent will not be liable for any delays or failures in performance resulting from acts beyond its reasonable control including, without limitation, acts of God,
terrorist acts, shortage of supply, breakdowns or malfunctions, interruptions or malfunction of computer facilities, or loss of data due to power failures or mechanical difficulties with information storage or retrieval systems, labor difficulties,
war, or civil unrest. 

  
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 9.    Certain Definitions. For purposes of this
Warrant Agreement, the following terms shall have the following meanings: 

9.1    “Affiliate” means, with respect to any Person, any other Person that directly or
indirectly controls, is controlled by, or is under common control with, such Person, it being understood for purposes of this definition that “control” of a Person means the power directly or indirectly either to vote 10% or more of the
stock having ordinary voting power for the election of directors of such Person or direct or cause the direction of the management and policies of such Person whether by contract or otherwise. 

9.2    “Attribution Parties” means, collectively, the following Persons and entities:
(i) any investment vehicle, including, any funds, feeder funds or managed accounts, currently, or from time to time after the Issuance Date, directly or indirectly managed or advised by the Holder’s investment manager or any of its
Affiliates or principals, (ii) any direct or indirect Affiliates of the Holder or any of the foregoing, (iii) any Person acting or who could be deemed to be acting as a Group together with the Holder or any of the foregoing and
(iv) any other Persons whose beneficial ownership of the Company’s Common Stock would or could be aggregated with the Holder’s and the other Attribution Parties for purposes of Section 13(d) of the 1934 Act. For clarity, the
purpose of the foregoing is to subject collectively the Holder and all other Attribution Parties to the Maximum Percentage. 

9.3    “Bid Price” means, for any security as of the particular time of determination,
the bid price for such security on the Principal Market as reported by Bloomberg as of such time of determination, or, if the Principal Market is not the principal securities exchange or trading market for such security, the bid price of such
security on the principal securities exchange or trading market where such security is listed or traded as reported by Bloomberg as of such time of determination, or if the foregoing does not apply, the bid price of such security in the over-the-counter market on the electronic bulletin board for such security as reported by Bloomberg as of such time of determination, or, if no bid price is reported for such
security by Bloomberg as of such time of determination, the average of the bid prices of any market makers for such security as reported in the “pink sheets” by OTC Markets Group Inc. (formerly Pink Sheets LLC) as of such time of
determination. If the Bid Price cannot be calculated for a security as of the particular time of determination on any of the foregoing bases, the Bid Price of such security as of such time of determination shall be the fair market value as mutually
determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the fair market value of such security, then such dispute shall be resolved in accordance with the procedures in Section 11. All such
determinations shall be appropriately adjusted for any stock dividend, stock split, stock combination or other similar transaction during such period. 

9.4    “Black Scholes Value” means the value of the Warrants based on the Black-Scholes
Option Pricing Model obtained from the “OV” function on Bloomberg determined as of the day immediately following the first public announcement of the applicable Change of Control, or, if the Change of Control is not publicly announced, the
date the Change of Control is consummated, for pricing purposes and reflecting (i) a risk-free interest rate corresponding to the 

  
 28 








 
U.S. Treasury rate for a period equal to the remaining term of the Warrants as of such date of request, (ii) an expected volatility equal to the lesser of (x) 100% and (y) the
volatility obtained from the HVT function on Bloomberg for the 30 Trading Day period beginning with the First Trading Day immediately following the public announcement of the applicable Change of Control (iii) the underlying price per share
used in such calculation shall be the greater of (a) the highest Weighted Average Price during the five (5) Trading Days prior to the closing of the Change of Control and (b) the sum of the price per share being offered in cash, if
any, plus the value of any non-cash consideration, if any, being offered in such Change of Control, (iv) a zero cost of borrow and (v) a 360 day annualization factor. 

9.5    “Business Day” means any day other than Saturday, Sunday or other day on which
commercial banks in The City of New York are authorized or required by law or executive order to remain closed. 

9.6    “Change of Control” means any Fundamental Transaction other than (i) any
reorganization, recapitalization or reclassification of the Common Stock in which holders of the Company’s voting power immediately prior to such reorganization, recapitalization or reclassification continue after such reorganization,
recapitalization or reclassification to hold publicly traded securities and, directly or indirectly, are, in all material respect, the holders of the voting power of the surviving entity (or entities with the authority or voting power to elect the
members of the board of directors (or their equivalent if other than a corporation) of such entity or entities) after such reorganization, recapitalization or reclassification, (ii) pursuant to a migratory merger effected solely for the purpose
of changing the jurisdiction of incorporation of the Company or (iii) a merger in connection with a bona fide acquisition by the Company of any Person in which (x) the gross consideration paid, directly or indirectly, by the Company in
such acquisition is not greater than 20% of the Company’s market capitalization as calculated on the date of the consummation of such merger and (y) such merger does not contemplate a change to the identity of a majority of the board of
directors of the Company. Notwithstanding anything herein to the contrary, any transaction or series of transaction that, directly or indirectly, results in the Company or the Successor Entity not having Common Stock or common stock, as applicable,
registered under the 1934 Act and listed on an Eligible Market shall be deemed a Change of Control. 

9.7    “Closing Bid Price” and “Closing Sale Price” means, for any
security as of any date, the last closing bid price and last closing trade price, respectively, for such security on the Principal Market, as reported by Bloomberg, or, if the Principal Market begins to operate on an extended hours basis and does
not designate the closing bid price or the closing trade price, as the case may be, then the last bid price or the last trade price, respectively, of such security prior to 4:00:00 p.m., New York time, as reported by Bloomberg, or, if the Principal
Market is not the principal securities exchange or trading market for such security, the last closing bid price or last trade price, respectively, of such security on the principal securities exchange or trading market where such security is listed
or traded as reported by Bloomberg, or if the foregoing do not apply, the last closing bid price or last trade price, respectively, of such security in the
over-the-counter market on the electronic bulletin board for such security as reported by Bloomberg, or, if no closing bid price or last trade price, respectively, is
reported for such security by Bloomberg, the average of the bid prices, or the ask prices, respectively, of any market makers for such security as reported in the OTC Link or “pink sheets” by OTC Markets Group Inc. (formerly


  
 29 








 
Pink OTC Markets Inc.). If the Closing Bid Price or the Closing Sale Price cannot be calculated for a security on a particular date on any of the foregoing bases, the Closing Bid Price or the
Closing Sale Price, as the case may be, of such security on such date shall be the fair market value as mutually determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the fair market value of such security,
then such dispute shall be resolved pursuant to Section 11. All such determinations to be appropriately adjusted for any stock dividend, stock split, stock combination, reclassification or other similar transaction during the applicable
calculation period. 
 9.8    “Common Stock” means (i) the Company’s shares
of Common Stock and (ii) any share capital into which such Common Stock shall have been changed or any share capital resulting from a reclassification of such Common Stock. 

9.9    “Control” (including the terms “controlling”, “controlled by”
or “under common control with”) means the possession, direct or indirect, of the power to direct or cause the direction of the management and policies of a Person, whether through the ownership of voting securities, by contract or
otherwise. 
 9.10    “Convertible Securities” means any stock or securities (other
than Options) directly or indirectly convertible into or exercisable or exchangeable for shares of Common Stock. 

9.11    “Expiration Date” means the date that is the five-year anniversary of the
Issuance Date (or [●], 2023) or, if such date falls on a day other than a Business Day or on which trading does not take place on the Principal Market (a “Holiday”), the next date that is not a Holiday, as the same may be extended
pursuant to Section 3.3.7. 
 9.12    “Fundamental Transaction” means
(A) that the Company shall, directly or indirectly, including through subsidiaries, Affiliates or otherwise, in one or more related transactions, (i) consolidate or merge with or into (whether or not the Company is the surviving
corporation) another Subject Entity, or (ii) sell, assign, transfer, convey or otherwise dispose of all or substantially all of the properties or assets of the Company or any of its “significant subsidiaries” (as defined in Rule 1-02 of Regulation S-X) to one or more Subject Entities, or (iii) make, or allow one or more Subject Entities to make, or allow the Company to be subject to or have its
shares of Common Stock be subject to or party to one or more Subject Entities making, a purchase, tender or exchange offer that is accepted by the holders of at least either (x) 50% of the outstanding shares of Common Stock, (y) 50% of the
outstanding shares of Common Stock calculated as if any shares of Common Stock held by all Subject Entities making or party to, or Affiliated with any Subject Entities making or party to, such purchase, tender or exchange offer were not outstanding;
or (z) such number of shares of Common Stock such that all Subject Entities making or party to, or Affiliated with any Subject Entity making or party to, such purchase, tender or exchange offer, become collectively the beneficial owners (as
defined in Rule 13d-3 under the 1934 Act) of at least 50% of the outstanding shares of Common Stock, or (iv) consummate a stock purchase agreement or other business combination (including, without
limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with one or more Subject Entities whereby all such Subject Entities, individually or in the aggregate, acquire, either
(x) at least 50% of the outstanding shares of Common Stock, (y) at least 50% of the 

  
 30 








 
outstanding shares of Common Stock calculated as if any shares of Common Stock held by all the Subject Entities making or party to, or Affiliated with any Subject Entity making or party to, such
stock purchase agreement or other business combination were not outstanding; or (z) such number of shares of Common Stock such that the Subject Entities become collectively the beneficial owners (as defined in Rule 13d-3 under the 1934 Act) of at least 50% of the outstanding shares of Common Stock, or (v) reorganize, recapitalize or reclassify its shares of Common Stock, (B) that the Company shall, directly or
indirectly, including through subsidiaries, Affiliates or otherwise, in one or more related transactions, allow any Subject Entity individually or the Subject Entities in the aggregate to be or become the “beneficial owner” (as defined in
Rule 13d-3 under the 1934 Act), directly or indirectly, whether through acquisition, purchase, assignment, conveyance, tender, tender offer, exchange, reduction in outstanding shares of Common Stock, merger,
consolidation, business combination, reorganization, recapitalization, spin-off, scheme of arrangement, reorganization, recapitalization or reclassification or otherwise in any manner whatsoever, of either
(x) at least 50% of the aggregate ordinary voting power represented by issued and outstanding shares of Common Stock, (y) at least 50% of the aggregate ordinary voting power represented by issued and outstanding shares of Common Stock not
held by all such Subject Entities as of the Issuance Date calculated as if any shares of Common Stock held by all such Subject Entities were not outstanding, or (z) a percentage of the aggregate ordinary voting power represented by issued and
outstanding shares of Common Stock or other equity securities of the Company sufficient to allow such Subject Entities to effect a statutory short form merger or other transaction requiring other stockholders of the Company to surrender their Common
Stock without approval of the stockholders of the Company or (C) directly or indirectly, including through subsidiaries, Affiliates or otherwise, in one or more related transactions, the issuance of or the entering into any other instrument or
transaction structured in a manner to circumvent, or that circumvents, the intent of this definition in which case this definition shall be construed and implemented in a manner otherwise than in strict conformity with the terms of this definition
to the extent necessary to correct this definition or any portion of this definition which may be defective or inconsistent with the intended treatment of such instrument or transaction. 

9.13    “Group” means a “group” as that term is used in Section 13(d) of
the 1934 Act and as defined in Rule 13d-5 thereunder. 

9.14    “Merger Event” means any of the following: (i) a sale, lease or other
transfer of all or substantially all assets of the Company, (ii) any merger or consolidation involving the Company in which the Company is not the surviving entity or in which the outstanding shares of the Company’s capital stock are
otherwise converted into or exchanged for shares of capital stock or other securities or property of another entity, or (iii) any sale by holders of the outstanding voting equity securities of the Company in a single transaction or series of
related transactions of shares constituting a majority of the outstanding combined voting power of the Company. 

9.15    “Options” means any rights, warrants or options to subscribe for or purchase
shares of Common Stock or Convertible Securities. 

  
 31 








 9.16    “Parent Entity” of a Person means an
entity that, directly or indirectly, controls the applicable Person, including such entity whose common stock or equivalent equity security is quoted or listed on an Eligible Market (or, if so elected by the Holder, any other market, exchange or
quotation system), or, if there is more than one such Person or such entity, the Person or such entity designated by the Holder or in the absence of such designation, such Person or entity with the largest public market capitalization as of the date
of consummation of the Fundamental Transaction. 
 9.17    “Person” means an
individual, a limited liability company, a partnership, a joint venture, a corporation, a trust, an unincorporated organization, any other entity and a government or any department or agency thereof. 

9.18    “Principal Market” means the principal securities exchange or securities market
on which the Common Shares are then traded. 
 9.19    “Standard Settlement Period”
means the standard settlement period, expressed in a number of Trading Days, on the Company’s primary Trading Market with respect to the Common Stock as in effect on the date of delivery of the Notice of Exercise. 

9.20    “Subject Entity” means any Person, Persons or Group or any Affiliate or associate
of any such Person, Persons or Group. 
 9.21    “Successor Entity” means one or more
Person or Persons (or, if so elected by the Holder, the Company or Parent Entity) formed by, resulting from or surviving any Fundamental Transaction or one or more Person or Persons (or, if so elected by the Holder, the Company or the Parent Entity)
with which such Fundamental Transaction shall have been entered into. 
 9.22    “Trading
Day” means any day on which the Common Stock is traded on the Principal Market, or, if the Principal Market is not the principal trading market for the Common Stock, then on the principal securities exchange or securities market on which
the Common Stock is then traded. 
 9.23    “Transaction Documents” means any agreement
entered into by and between the Company and the Holder, as applicable. 
 9.24    “Weighted
Average Price” means, for any security as of any date, the dollar volume-weighted average price for such security on the Principal Market during the period beginning at 9:30:01 a.m., New York time (or such other time as the Principal Market
publicly announces is the official open of trading), and ending at 4:00:00 p.m., New York time (or such other time as the Principal Market publicly announces is the official close of trading), as reported by Bloomberg through its “Volume at
Price” function or, if the foregoing does not apply, the dollar volume-weighted average price of such security in the over-the-counter market on the electronic
bulletin board for such security during the period beginning at 9:30:01 a.m., New York time (or such other time as such market publicly announces is the official open of trading), and ending at 4:00:00 p.m., New York time (or such other time as such
market publicly announces is the official close of trading), as reported by Bloomberg, or, if no dollar volume-weighted average price is reported for such security by Bloomberg for such hours, the average of the highest Closing Bid Price and the
lowest closing ask price of any of the market makers for such security as reported in the OTC Link or “pink sheets” by OTC Markets Group Inc. (formerly Pink OTC Markets Inc.). If the Weighted Average Price cannot be calculated for a


  
 32 








 
security on a particular date on any of the foregoing bases, the Weighted Average Price of such security on such date shall be the fair market value as mutually determined by the Company and the
Holder. If the Company and the Holder are unable to agree upon the fair market value of such security, then such dispute shall be resolved pursuant to Section 11 with the term “Weighted Average Price” being substituted for the term
“Exercise Price.” All such determinations shall be appropriately adjusted for any stock dividend, stock split, stock combination, reclassification or other similar transaction during the applicable calculation period. 

[Remainder of page intentionally left blank. Signature page follows.] 

  
 33 








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

			
	SELLAS LIFE SCIENCES GROUP, INC.


 
			
		
	 By:
	 	  

	 Name:
	 	
	 Title:
	 	


 
			
	
	COMPUTERSHARE INC.


 
			
		
	 By:
	 	  

	 Name:
	 	
	 Title:
	 	


 
			
	
	COMPUTERSHARE TRUST COMPANY, N.A.


 
			
		
	 By:
	 	  

	 Name:
	 	
	 Title:
	 	


 [Signature Page to Warrant Agreement] 







 EXHIBIT A 

[FORM OF GLOBAL CERTIFICATE] 

SELLAS LIFE SCIENCES GROUP, INC. 

WARRANT CERTIFICATE 
 THIS
CERTIFIES THAT, for value received is the registered holder of a Warrant or Warrants (the “Warrant “) expiring the date sixty (60) months after the Initial Exercisability Date or, if such date falls on a day other than a
Business Day or on which trading does not take place on the Principal Market (a “Holiday”), the next day that is not a Holiday, subject to extension in certain events (“Expiration Date”), to purchase
                 fully paid and non-assessable shares (“Shares”) of Common Stock, par value $0.0001 per share
(“Common Stock”), of SELLAS Life Science Group, Inc., a Delaware corporation (the “Company”). The Warrant entitles the holder thereof to purchase from the Company such number of shares of Common Stock at the price
of $                 per share (subject to adjustment), upon surrender of this Warrant Certificate and payment of the Warrant Price to Computershare Inc. and
Computershare Trust Company, N.A. (collectively, the “Warrant Agent”), at its offices designated for such purpose, but only subject to the conditions set forth herein and in the Warrant Agreement between the Company and the Warrant
Agent (as may be amended from time to time, the “Warrant Agreement”). The Warrant Agreement provides that upon the occurrence of certain events, the Warrant Price and the number of Shares purchasable hereunder, set forth on the face
hereof, may, subject to certain conditions, be adjusted. The term “Warrant Price” as used in this Warrant Certificate refers to the price per share of Common Stock at which Shares may be purchased at the time the Warrant is
exercised. Capitalized terms used and not defined herein shall have the meanings set forth in the Warrant Agreement. 
 No fraction of a
Share will be issued upon any exercise of a Warrant. If the holder of a Warrant would be entitled to receive a fraction of a Share upon any exercise of a Warrant, the Company shall, at its election, either pay a cash adjustment in respect of such
fraction in an amount equal to such fraction multiplied by the Exercise Price or round up such fraction to the next whole share. 
 Upon any
exercise of the Warrant for less than the total number of full Shares provided for herein, there shall be issued to the registered holder hereof or the registered holder’s assignee a new Warrant Certificate covering the number of Shares for
which the Warrant has not been exercised, provided that such holder has previously surrendered this Warrant to the Warrant Agent. 
 Upon
surrender of the Warrant Certificate for transfer, properly endorsed with signatures properly guaranteed and accompanied by appropriate instructions for transfer, the Warrant Agent shall register the transfer. A new Warrant Certificate or Warrant
Certificates evidencing in the aggregate a like number of Warrants shall be issued and the old Warrant Certificate shall be canceled. 







 Warrant Certificates, when surrendered to the Warrant Agent, may be transferred or exchanged in
the manner and subject to the limitations provided in the Warrant Agreement, but without payment of any service charge, for another Warrant Certificate or Warrant Certificates evidencing in the aggregate a like number of Warrants. 

The Company and the Warrant Agent may deem and treat the registered holder as the absolute owner of this Warrant Certificate (notwithstanding
any notation of ownership or other writing hereon made by anyone), for the purpose of any exercise hereof, and for all other purposes, and neither the Company nor the Warrant Agent shall be affected by any notice to the contrary. 

This Warrant Certificate does not entitle the registered holder to any of the rights of a stockholder of the Company. 

 

			
	 SELLAS LIFE SCIENCES GROUP, INC.





			
		
	 By:
	 	
                 


	 Name:
	 	
	 Title:
	 	


 
			
	
	 COUNTERSIGNED:

	
	 COMPUTERSHARE INC.

as Warrant Agent



 
			
		
	 By:
	 	
                 


	 Authorized Officer

	
	 COMPUTERSHARE TRUST COMPANY, N.A.

as Warrant Agent



 
			
		
	 By:
	 	
             

	 Authorized Officer



 [Signature page to Warrant Certificate] 







 ELECTION TO PURCHASE FORM 

(to be executed by the registered holder in order to exercise Warrants) 

The undersigned registered holder irrevocably elects to exercise Warrants to
                 purchase                  shares of Common Stock represented by this
Warrant Certificate and to purchase such shares of Common Stock issuable upon the exercise of such Warrants, and requests that such shares shall be issued in the name of 
  

	
	  

	 (PLEASE TYPE OR PRINT NAME AND ADDRESS)

	
	  

	
	  

	
	  

	 (SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER) and be delivered to:

	
	  

	
	 (PLEASE PRINT OR TYPE NAME AND ADDRESS)


 and, at the sole election of the registered holder, if such number of Warrants shall not be all the Warrants
evidenced by this Warrant Certificate, that a new Warrant Certificate for the balance of such Warrants be registered in the name of, and delivered to, the registered holder at the address stated below: 

 

			
	 Dated:
	 	
                    

	
	  

	 (SIGNATURE)

	
	  

	
	  

	 (ADDRESS)

		
	 	 	 
	
	  

	 (TAX IDENTIFICATION NUMBER)









 ASSIGNMENT 

(to be executed by the registered holder in order to assign Warrants) 

For Value Received,                  hereby sells, assigns,
and transfers unto 
  

	
	 
	 (PLEASE TYPE OR PRINT NAME AND ADDRESS)

	
	 
	
	 
	
	 
	 (SOCIAL SECURITY OR TAX IDENTIFICATION NUMBER) and be delivered to:

	
	 
	
	 (PLEASE PRINT OR TYPE NAME AND ADDRESS)


 Warrants to purchase
                 shares of Common Stock represented by this Warrant Certificate, and hereby irrevocably constitutes and appoints
                 Attorney to transfer this Warrant Certificate on the books of the Company, with full power of substitution in the premises. 

 

	
	 Dated:
                    

	
	 
	 (SIGNATURE)


 The signature to the assignment of the Subscription Form must correspond to the name written upon the face of
this Warrant Certificate in every particular, without alteration or enlargement or any change whatsoever, and must be guaranteed by a commercial bank or trust company or a member firm of the American Stock Exchange, New York Stock Exchange, Pacific
Stock Exchange or Chicago Stock Exchange. 

  
 - 4 - 








 Exhibit B 

[FORM OF CERTIFICATED WARRANT] 

SELLAS LIFE SCIENCES GROUP, INC 

WARRANT TO PURCHASE COMMON STOCK 

Warrant No.:                  

Number of Shares of Common Stock:
                     
 Date of Issuance:
[            ], 2018 (“Issuance Date”) 

SELLAS Life Sciences Group, a company organized under the laws of [Delaware] (the “Company”), hereby
certifies that, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, [HOLDER], the registered holder hereof or its permitted assigns (the “Holder”), is entitled, subject to the terms set
forth below, to purchase from the Company, at the Exercise Price (as defined below) then in effect, at any time or times on or after [            , 2018] (the “Initial
Exercisability Date”), but not after 11:59 p.m., New York time, on the Expiration Date, (as defined below),                 
(                ) fully paid non-assessable shares of Common Stock (as defined below), subject to adjustment as provided
herein (the “Warrant Shares”). Except as otherwise defined herein, capitalized terms in this Warrant to Purchase Common Stock (including any Warrants to Purchase Common Stock issued in exchange, transfer or replacement
hereof, this “Warrant”), shall have the meanings set forth in Section 16. This Warrant is one of the Warrants to Purchase Common Stock (the “Warrants”) issued pursuant to (i) that certain Underwriting
Agreement, dated as of [                ], 2018 (the “Subscription Date”) by and between the Company and Oppenheimer & Co. Inc., (ii) the
Company’s Registration Statement on Form S-1 (File number 333-225140) (the “Registration Statement”). This Warrant shall initially be issued and
maintained in the form of a security held in book-entry form and the Depository Trust Company or its nominee (“DTC”) shall initially be the sole registered holder of this Warrant, subject to a Holder’s right to elect to receive
a Warrant in certificated form pursuant to the terms of the Warrant Agent Agreement, in which case this sentence shall not apply. 

1.    EXERCISE OF WARRANT. 

(a)    Mechanics of Exercise. Subject to the terms and conditions hereof (including, without
limitation, the limitations set forth in Section 1(f)), this Warrant may be exercised by the Holder at any time or times on or after the Initial Exercisability Date, in whole or in part, by delivery (whether via facsimile, electronic mail or
otherwise) of a written notice, in the form attached hereto as Exhibit A (the “Exercise Notice”), of the Holder’s election to exercise this Warrant. Within one (1) Trading Day following the delivery of the Exercise
Notice, the Holder shall make payment to the Company of an amount equal to the Exercise Price in effect on the date of such exercise multiplied by the number of Warrant Shares as to which this Warrant is being exercised (the “Aggregate
Exercise Price”) in cash by wire transfer of immediately available funds or, if the provisions of Section 1(d) are applicable, by notifying the Company that this Warrant is being exercised pursuant to a Cashless Exercise (as defined in
Section 1(d)). The Holder shall not be required to deliver the original Warrant in order to effect an exercise hereunder, nor shall any ink-original signature or medallion guarantee (or other type of
guarantee or notarization) with respect to any Exercise Notice be required. Execution and delivery of the 

  
 - 5 - 








 
Exercise Notice with respect to less than all of the Warrant Shares shall have the same effect as cancellation of the original Warrant and issuance of a new Warrant evidencing the right to
purchase the remaining number of Warrant Shares and the Holder shall not be required to physically surrender this Warrant to the Company until the Holder has purchased all of the Warrant Shares available hereunder and the Warrant has been exercised
in full, in which case, the Holder shall surrender this Warrant to the Company for cancellation within three (3) Trading Days of the date on which the final Notice of Exercise is delivered to the Company. On or before the first (1st) Trading Day following the date on which the Holder has delivered the applicable Exercise Notice, the Company shall transmit by facsimile or electronic mail an acknowledgment of confirmation of
receipt of the Exercise Notice, in the form attached to the Exercise Notice, to the Holder and the Company’s transfer agent (the “Transfer Agent”). So long as the Holder delivers the Aggregate Exercise Price (or notice of a
Cashless Exercise) on or prior to the first (1st) Trading Day following the date on which the Exercise Notice has been delivered to the Company, then on or prior to the earlier of (i) the
second (2nd) Trading Day and (ii) the number of Trading Days comprising the Standard Settlement Period, in each case following the date on which the Exercise Notice has been delivered to the
Company, or, if the Holder does not deliver the Aggregate Exercise Price (or notice of a Cashless Exercise) on or prior to the first (1st) Trading Day following the date on which the Exercise
Notice has been delivered to the Company, then on or prior to the first (1st) Trading Day following the date on which the Aggregate Exercise Price (or notice of a Cashless Exercise) is delivered
(such earlier date, the “Share Delivery Date”), the Company shall (X) provided that the Transfer Agent is participating in The Depository Trust Company (“DTC”) Fast Automated Securities Transfer Program, credit
such aggregate number of Warrant Shares to which the Holder is entitled pursuant to such exercise to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At Custodian system, or (Y) if the Transfer
Agent is not participating in the DTC Fast Automated Securities Transfer Program, issue and dispatch by overnight courier to the address as specified in the Exercise Notice, a certificate, registered in the name of the Holder or its designee, for
the number of Warrant Shares to which the Holder is entitled pursuant to such exercise. If the Company fails for any reason to deliver to such registered holder or Participant, as the case may be, the Warrant Shares subject to an exercise notice by
the Warrant Share Delivery Date, the Company shall pay to the registered holder, in cash, as liquidated damages and not as a penalty, for each $1,000 of Warrant Shares subject to such exercise (based on the Weighted Average Price of the Common Stock
on the date of the applicable exercise notice), $10 per Trading Day (increasing to $20 per Trading Day on the fifth Trading Day after such liquidated damages begin to accrue) for each Trading Day after such Warrant Share Delivery Date until such
Warrant Shares are delivered or the registered holder rescinds such exercise. The Company shall be responsible for all fees and expenses of the Transfer Agent and all fees and expenses with respect to the issuance of Warrant Shares via DTC, if any,
including without limitation for same day processing. Upon delivery of the Exercise Notice, the Holder shall be deemed for all corporate purposes to have become the holder of record and beneficial owner of the Warrant Shares with respect to which
this Warrant has been exercised, irrespective of the date such Warrant Shares are credited to the Holder’s DTC account or the date of delivery of the certificates evidencing such Warrant Shares, as the case may be. If this Warrant is physically
delivered to the Company in connection with any exercise pursuant to this Section 1(a) and the number of Warrant Shares represented by this Warrant submitted for exercise is greater than the number of Warrant Shares being acquired upon an
exercise, then the Company shall as soon as practicable and in no event later than three (3) Trading Days after any exercise and at its own expense, issue and deliver 

  
 - 6 - 








 
to the Holder (or its designee) a new Warrant (in accordance with Section 7(d)) representing the right to purchase the number of Warrant Shares issuable immediately prior to such exercise
under this Warrant, less the number of Warrant Shares with respect to which this Warrant is exercised. No fractional Warrant Shares are to be issued upon the exercise of this Warrant, but rather the number of Warrant Shares to be issued shall be
rounded to the nearest whole number. The Company shall pay any and all transfer, stamp, issuance and similar taxes, costs and expenses (including, without limitation, fees and expenses of the Transfer Agent) which may be payable with respect to the
issuance and delivery of Warrant Shares upon exercise of this Warrant. The Company’s obligations to issue and deliver Warrant Shares in accordance with the terms and subject to the conditions hereof are absolute and unconditional, irrespective
of any action or inaction by the Holder to enforce the same, any waiver or consent with respect to any provision hereof, the recovery of any judgment against any Person or any action to enforce the same, or any setoff, counterclaim, recoupment,
limitation or termination; provided, however, that the Company shall not be required to deliver Warrant Shares with respect to an exercise prior to the Holder’s delivery of the Aggregate Exercise Price (or notice of a Cashless
Exercise) with respect to such exercise. 
 (b)    Exercise Price. For purposes of this Warrant,
“Exercise Price” means $[    ] per share, subject to adjustment as provided herein. 

(c)    Company’s Failure to Timely Deliver Securities. If either (I) the Company shall
fail for any reason or for no reason on or prior to the applicable Share Delivery Date, (x) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program, to issue to the Holder a certificate for the number of
shares of Common Stock to which the Holder is entitled and register such Common Stock on the Company’s share register or (y) if the Transfer Agent is participating in the DTC Fast Automated Securities Transfer Program, to credit the
Holder’s balance account with DTC, for such number of shares of Common Stock to which the Holder is entitled upon the Holder’s exercise of this Warrant or (II) a registration statement (which may be the Registration Statement)
covering the issuance or resale of the Warrant Shares that are the subject of the Exercise Notice (the “Exercise Notice Warrant Shares”) is not available for the issuance or resale, as applicable, of such Exercise Notice Warrant
Shares and (x) the Company fails to promptly, but in no event later than one (1) Business Day after such registration statement becomes unavailable, to so notify the Holder and (y) the Company is unable to deliver the Exercise Notice
Warrant Shares electronically without any restrictive legend by crediting such aggregate number of Exercise Notice Warrant Shares to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At Custodian
system (the event described in the immediately foregoing clause (II) is hereinafter referred to as a “Notice Failure” and, together with the event described in clause (I) above, an “Exercise Failure”),
then, in addition to all other remedies available to the Holder, if on or prior to the applicable Share Delivery Date either (I) if the Transfer Agent is not participating in the DTC Fast Automated Securities Transfer Program, the Company shall
fail to issue and deliver a certificate to the Holder and register such shares of Common Stock on the Company’s share register or, if the Transfer Agent is participating in the DTC Fast Automated Securities Transfer Program, credit the
Holder’s balance account with DTC for the number of shares of Common Stock to which the Holder is entitled upon the Holder’s exercise hereunder or pursuant to the Company’s obligation pursuant to clause (ii) below or (II) a
Notice Failure occurs, and if on or after such Trading Day the Holder purchases (in an open market transaction or otherwise) Common Stock to deliver in satisfaction of 

  
 - 7 - 








 
a sale by the Holder of shares of Common Stock issuable upon such exercise that the Holder anticipated receiving from the Company (a
“Buy-In”), then the Company shall, within three (3) Trading Days after the Holder’s request and in the Holder’s discretion, either (i) pay cash to the Holder in an amount
equal to the Holder’s total purchase price (including brokerage commissions and other out-of-pocket expenses, if any) for the shares of Common Stock so purchased
(the “Buy-In Price”), at which point the Company’s obligation to deliver such certificate (and to issue such shares of Common Stock) or credit such Holder’s balance account with DTC
for such shares of Common Stock shall terminate, or (ii) promptly honor its obligation to deliver to the Holder a certificate or certificates representing such shares of Common Stock or credit such Holder’s balance account with DTC, as
applicable, and pay cash to the Holder in an amount equal to the excess (if any) of the Buy-In Price over the product of (A) such number of shares of Common Stock, times (B) any trading price of the
Common Stock selected by the Holder in writing as in effect at any time during the period beginning on the applicable Exercise Date and ending on the applicable Share Delivery Date. Nothing shall limit the Holder’s right to pursue any other
remedies available to it hereunder, at law or in equity, including, without limitation, a decree of specific performance and/or injunctive relief with respect to the Company’s failure to timely deliver certificates representing Warrant Shares
(or to electronically deliver such Warrant Shares) upon the exercise of this Warrant as required pursuant to the terms hereof. While this Warrant is outstanding, the Company shall cause its transfer agent to participate in the DTC Fast Automated
Securities Transfer Program. In addition to the foregoing rights, (i) if the Company fails to deliver the applicable number of Warrant Shares upon an exercise pursuant to Section 1 by the applicable Share Delivery Date, then the Holder
shall have the right to rescind such exercise in whole or in part and retain and/or have the Company return, as the case may be, any portion of this Warrant that has not been exercised pursuant to such Exercise Notice; provided that the rescission
of an exercise shall not affect the Company’s obligation to make any payments that have accrued prior to the date of such notice pursuant to this Section 1(c) or otherwise, and (ii) if a registration statement (which may be the
Registration Statement) covering the issuance or resale of the Warrant Shares that are subject to an Exercise Notice is not available for the issuance or resale, as applicable, of such Exercise Notice Warrant Shares and the Holder has submitted an
Exercise Notice prior to receiving notice of the non-availability of such registration statement and the Company has not already delivered the Warrant Shares underlying such Exercise Notice electronically
without any restrictive legend by crediting such aggregate number of Warrant Shares to which the Holder is entitled pursuant to such exercise to the Holder’s or its designee’s balance account with DTC through its Deposit / Withdrawal At
Custodian system, the Holder shall have the option, by delivery of notice to the Company, to (x) rescind such Exercise Notice in whole or in part and retain or have returned, as the case may be, any portion of this Warrant that has not been
exercised pursuant to such Exercise Notice; provided that the rescission of an Exercise Notice shall not affect the Company’s obligation to make any payments that have accrued prior to the date of such notice pursuant to this Section 1(c)
or otherwise, and/or (y) switch some or all of such Exercise Notice from a cash exercise to a Cashless Exercise. 

(d)    Cashless Exercise. Notwithstanding anything contained herein to the contrary, if a
registration statement (which may be the Registration Statement) covering the issuance or resale of the Exercise Notice Warrant Shares is not available for the issuance or resale, as applicable, of such Exercise Notice Warrant Shares, the Holder
may, in its sole discretion, exercise this Warrant in whole or in part and, in lieu of making the cash payment otherwise contemplated to be made to the Company upon such exercise in payment of the Aggregate Exercise


  
 - 8 - 








 
Price, elect instead to receive upon such exercise the “Net Number” of shares of Common Stock determined according to the following formula (a “Cashless Exercise”):

  

			
	 Net Number = (A x B) - (A x C)

	
                       
             B

	
	 For purposes of the foregoing formula:


  

	 	A=	 the total number of shares with respect to which this Warrant is then being exercised. 



 

	 	B=	 as applicable: (i) the Closing Sale Price of the Common Stock on the Trading Day immediately preceding
the date of the applicable Exercise Notice if such Exercise Notice is (1) both executed and delivered pursuant to Section 1(a) hereof on a day that is not a Trading Day or (2) both executed and delivered pursuant to Section 1(a)
hereof on a Trading Day prior to the opening of “regular trading hours” (as defined in Rule 600(b)(64) of Regulation NMS promulgated under the federal securities laws) on such Trading Day, (ii) at the option of the Holder, either
(y) the Weighted Average Price on the Trading Day immediately preceding the date of the applicable Notice of Exercise or (z)    the Bid Price of the Common Stock as of the time of the Holder’s execution of the
applicable Exercise Notice if such Exercise Notice is executed during “regular trading hours” on a Trading Day and is delivered within two (2) hours thereafter (including until two (2) hours after the close of “regular
trading hours” on a Trading Day) pursuant to Section 1(a) hereof or (iii) the Closing Sale Price of the Common Stock on the date of the applicable Exercise Notice if the date of such Exercise Notice is a Trading Day and such Exercise
Notice is both executed and delivered pursuant to Section 1(a) hereof after the close of “regular trading hours” on such Trading Day. 


  

	 	C=	 the Exercise Price then in effect for the applicable Warrant Shares at the time of such exercise.



 If Warrant Shares are issued in such a cashless exercise, the Company acknowledges and agrees that in
accordance with Section 3(a)(9) of the Securities Act of 1933, as amended, the Warrant Shares shall take on the registered characteristics of the Warrants being exercised, and the holding period of the Warrants being exercised may be tacked on
to the holding period of the Warrant Shares. The Company agrees not to take any position contrary to this Section 1(d). 

(e)    Disputes. In the case of a dispute as to the determination of the Exercise Price or the
arithmetic calculation of the Warrant Shares, the Company shall promptly issue to the Holder the number of Warrant Shares that are not disputed and resolve such dispute in accordance with Section 11. 

(f)     Beneficial Ownership. Notwithstanding anything to the contrary contained herein, the
Company shall not effect the exercise of any portion of this Warrant, and the Holder shall not have the right to exercise any portion of this Warrant, pursuant to the terms and 

  
 - 9 - 








 
conditions of this Warrant and any such exercise shall be null and void and treated as if never made, to the extent that after giving effect to such exercise, the Holder together with the other
Attribution Parties collectively would beneficially own in excess of 4.99 (the “Maximum Percentage”) of the number of shares of Common Stock outstanding immediately after giving effect to such exercise. For purposes of the foregoing
sentence, the aggregate number of shares of Common Stock beneficially owned by the Holder and the other Attribution Parties shall include the number of shares of Common Stock held by the Holder and all other Attribution Parties plus the number of
shares of Common Stock issuable upon exercise of this Warrant with respect to which the determination of such sentence is being made, but shall exclude the number of shares of Common Stock which would be issuable upon (A) exercise of the
remaining, unexercised portion of this Warrant beneficially owned by the Holder or any of the other Attribution Parties and (B) exercise or conversion of the unexercised or unconverted portion of any other securities of the Company (including,
without limitation, any convertible notes or convertible preferred stock or warrants, including the other Warrants) beneficially owned by the Holder or any other Attribution Party subject to a limitation on conversion or exercise analogous to the
limitation contained in this Section 1(f). For purposes of this Section 1(f), beneficial ownership shall be calculated in accordance with Section 13(d) of the Securities Exchange Act of 1934, as amended (the “1934
Act”). For purposes of this Warrant, in determining the number of outstanding shares of Common Stock the Holder may acquire upon the exercise of this Warrant without exceeding the Maximum Percentage, the Holder may rely on the number of
outstanding shares of Common Stock as reflected in (x) the Company’s most recent Annual Report on Form 10-K, Quarterly Report on Form 10-Q and Current Reports
on Form 8-K or other public filing with the Securities and Exchange Commission (the “SEC”), as the case may be, (y) a more recent public announcement by the Company or (z) any other
written notice by the Company or the Transfer Agent setting forth the number of shares of Common Stock outstanding (the “Reported Outstanding Share Number”). If the Company receives an Exercise Notice from the Holder at a time when
the actual number of outstanding shares of Common Stock is less than the Reported Outstanding Share Number, the Company shall (i) notify the Holder in writing of the number of shares of Common Stock then outstanding and, to the extent that such
Exercise Notice would otherwise cause the Holder’s beneficial ownership, as determined pursuant to this Section 1(f), to exceed the Maximum Percentage, the Holder must notify the Company of a reduced number of Warrant Shares to be
purchased pursuant to such Exercise Notice (the number of shares by which such purchase is reduced, the “Reduction Shares”) and (ii) as soon as reasonably practicable, the Company shall return to the Holder any exercise price
paid by the Holder for the Reduction Shares. For any reason at any time, upon the written or oral request of the Holder, the Company shall within one (1) Business Day confirm orally and in writing or by electronic mail to the Holder the number
of shares of Common Stock then outstanding. In any case, the number of outstanding shares of Common Stock shall be determined after giving effect to the conversion or exercise of securities of the Company, including this Warrant, by the Holder and
any other Attribution Party since the date as of which the Reported Outstanding Share Number was reported. In the event that the issuance of Common Stock to the Holder upon exercise of this Warrant results in the Holder and the other Attribution
Parties being deemed to beneficially own, in the aggregate, more than the Maximum Percentage of the number of outstanding shares of Common Stock (as determined under Section 13(d) of the 1934 Act), the number of shares so issued by which the
Holder’s and the other Attribution Parties’ aggregate beneficial ownership exceeds the Maximum Percentage (the “Excess Shares”) shall be deemed null and void and shall be cancelled ab initio, and the Holder shall not


  
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have the power to vote or to transfer the Excess Shares. As soon as reasonably practicable after the issuance of the Excess Shares has been deemed null and void, the Company shall return to the
Holder the exercise price paid by the Holder for the Excess Shares. Upon delivery of a written notice to the Company, the Holder may from time to time increase or decrease the Maximum Percentage to any other percentage not in excess of 4.99% as
specified in such notice; provided that (i) any such increase in the Maximum Percentage will not be effective until the sixty-first (61st) day after such notice is delivered to the Company
and (ii) any such increase or decrease will apply only to the Holder and the other Attribution Parties and not to any other holder of Warrants that is not an Attribution Party of the Holder. For purposes of clarity, the shares of Common Stock
issuable pursuant to the terms of this Warrant in excess of the Maximum Percentage shall not be deemed to be beneficially owned by the Holder for any purpose including for purposes of Section 13(d) or Rule
16a-1(a)(1) of the 1934 Act. No prior inability to exercise this Warrant pursuant to this paragraph shall have any effect on the applicability of the provisions of this paragraph with respect to any subsequent
determination of exercisability. The provisions of this paragraph shall be construed and implemented in a manner otherwise than in strict conformity with the terms of this Section 1(f) to the extent necessary to correct this paragraph or any
portion of this paragraph which may be defective or inconsistent with the intended beneficial ownership limitation contained in this Section 1(f) or to make changes or supplements necessary or desirable to properly give effect to such
limitation. The limitation contained in this paragraph may not be waived and shall apply to a successor holder of this Warrant. 

(g)    Required Reserve Amount. So long as this Warrant remains outstanding, the Company
shall at all times keep reserved for issuance under this Warrant a number of shares of Common Stock at least equal to 100% of the maximum number of shares of Common Stock as shall be necessary to satisfy the Company’s obligation to issue shares
of Common Stock under the Warrants then outstanding (without regard to any limitations on exercise) (the “Required Reserve Amount”); provided that at no time shall the number of shares of Common Stock reserved pursuant to
this Section 1(g) be reduced other than in connection with any exercise of Warrants or such other event covered by Section 2(c) below. The Required Reserve Amount (including, without limitation, each increase in the number of shares
so reserved) shall be allocated pro rata among the holders of the Warrants based on the number of shares of Common Stock issuable upon exercise of Warrants held by each holder thereof on the Issuance Date (without regard to any limitations on
exercise) (the “Authorized Share Allocation”). In the event that a holder shall sell or otherwise transfer any of such holder’s Warrants, each transferee shall be allocated a pro rata portion of such holder’s Authorized
Share Allocation. Any shares of Common Stock reserved and allocated to any Person which ceases to hold any Warrants shall be allocated to the remaining holders of Warrants, pro rata based on the number of shares of Common Stock issuable upon
exercise of the Warrants then held by such holders thereof (without regard to any limitations on exercise). 

(h)    Insufficient Authorized Shares. If at any time while this Warrant remains outstanding the
Company does not have a sufficient number of authorized and unreserved shares of Common Stock to satisfy its obligation to reserve for issuance the Required Reserve Amount (an “Authorized Share Failure”), then the Company shall
promptly take all action reasonably necessary to increase the Company’s authorized shares of Common Stock to an amount sufficient to allow the Company to reserve the Required Reserve Amount for this Warrant then outstanding. Without limiting
the generality of the foregoing sentence, as soon as practicable after 

  
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the date of the occurrence of an Authorized Share Failure, but in no event later than ninety (90) days after the occurrence of such Authorized Share Failure, the Company shall hold a meeting
of its stockholders for the approval of an increase in the number of authorized shares of Common Stock. In connection with such meeting, the Company shall provide each stockholder with a proxy statement and shall use its reasonable best efforts to
solicit its stockholders’ approval of such increase in authorized shares of Common Stock and to cause its board of directors to recommend to the stockholders that they approve such proposal. Notwithstanding the foregoing, if any such time of an
Authorized Share Failure, the Company is able to obtain the written consent of a majority of the shares of its issued and outstanding shares of Common Stock to approve the increase in the number of authorized shares of Common Stock, the Company may
satisfy this obligation by obtaining such consent and submitting for filing with the SEC an Information Statement on Schedule 14C. 

2.     ADJUSTMENT OF EXERCISE PRICE AND NUMBER OF WARRANT SHARES. The Exercise Price and the number
of Warrant Shares shall be adjusted from time to time as follows: 
 (a)    Intentionally
omitted. 
 (b)    Voluntary Adjustment By Company. The Company may at any time during the
term of this Warrant reduce the then current Exercise Price to any amount and for any period of time deemed appropriate by the Board of Directors of the Company. 

(c)    Adjustment Upon Subdivision or Combination of Common Stock. If the Company at any time on
or after the Subscription Date subdivides (by any stock split, stock dividend, recapitalization or otherwise) one or more classes of its outstanding shares of Common Stock into a greater number of shares, the Exercise Price in effect immediately
prior to such subdivision will be proportionately reduced and the number of Warrant Shares will be proportionately increased. If the Company at any time on or after the Subscription Date combines (by combination, reverse stock split or otherwise)
one or more classes of its outstanding shares of Common Stock into a smaller number of shares, the Exercise Price in effect immediately prior to such combination will be proportionately increased and the number of Warrant Shares will be
proportionately decreased. Any adjustment under this Section 2(c) shall become effective at the close of business on the date the subdivision or combination becomes effective. 

(d)    Other Events. If any event occurs of the type contemplated by the provisions of this
Section 2 but not expressly provided for by such provisions (including, without limitation, the granting of stock appreciation rights, phantom stock rights or other rights with equity features), then the Company’s Board of Directors will
make an appropriate adjustment in the Exercise Price and the number of Warrant Shares, as mutually determined by the Company’s Board of Directors and the Required Holders, so as to protect the rights of the Holder; provided that no such
adjustment pursuant to this Section 2(d) will increase the Exercise Price or decrease the number of Warrant Shares as otherwise determined pursuant to this Section 2. 

3.    RIGHTS UPON DISTRIBUTION OF ASSETS. In addition to any adjustments pursuant to Section 2
above, if, on or after the Subscription Date and on or prior to the Expiration Date, the Company shall declare or make any dividend or other distribution of its assets (or rights 

  
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to acquire its assets) to holders of shares of Common Stock, by way of return of capital or otherwise (including, without limitation, any distribution of cash, stock or other securities,
property, options, evidence of indebtedness or any other assets by way of a dividend, spin off, reclassification, corporate rearrangement, scheme of arrangement or other similar transaction) (a “Distribution”), at any time after the
issuance of this Warrant, then, in each such case, the Holder shall be entitled to participate in such Distribution to the same extent that the Holder would have participated therein if the Holder had held the number of shares of Common Stock
acquirable upon complete exercise of this Warrant (without regard to any limitations or restrictions on exercise of this Warrant, including without limitation, the Maximum Percentage) immediately before the date on which a record is taken for such
Distribution, or, if no such record is taken, the date as of which the record holders of shares of Common Stock are to be determined for the participation in such Distribution (provided, however, that to the extent that the
Holder’s right to participate in any such Distribution would result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, then the Holder shall not be entitled to participate in such Distribution to such extent (and
shall not be entitled to beneficial ownership of such shares of Common Stock as a result of such Distribution (and beneficial ownership) to such extent) and the portion of such Distribution shall be held in abeyance for the benefit of the Holder
until such time or times as its right thereto would not result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, at which time or times the Holder shall be granted such Distribution (and any Distributions declared or
made on such initial Distribution or on any subsequent Distribution held similarly in abeyance) to the same extent as if there had been no such limitation). 

4.     PURCHASE RIGHTS; FUNDAMENTAL TRANSACTIONS. 

(a)    Purchase Rights. In addition to any adjustments pursuant to Section 2 above, if at any
time on or after the Subscription Date and on or prior to the Expiration Date the Company grants, issues or sells any Options, Convertible Securities or rights to purchase stock, warrants, securities or other property pro rata to the record holders
of any class of Common Stock (the “Purchase Rights”), then the Holder will be entitled to acquire, upon the terms applicable to such Purchase Rights, the aggregate Purchase Rights which the Holder could have acquired if the Holder
had held the number of shares of Common Stock acquirable upon complete exercise of this Warrant (without regard to any limitations or restrictions on exercise of this Warrant, including without limitation, the Maximum Percentage) immediately before
the date on which a record is taken for the grant, issuance or sale of such Purchase Rights, or, if no such record is taken, the date as of which the record holders of Common Stock are to be determined for the grant, issuance or sale of such
Purchase Rights (provided, however, that to the extent that the Holder’s right to participate in any such Purchase Right would result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, then the
Holder shall not be entitled to participate in such Purchase Right to such extent (and shall not be entitled to beneficial ownership of such Common Stock as a result of such Purchase Right (and beneficial ownership) to such extent) and such Purchase
Right to such extent shall be held in abeyance for the benefit of the Holder until such time or times as its right thereto would not result in the Holder and the other Attribution Parties exceeding the Maximum Percentage, at which time or times the
Holder shall be granted such right (and any Purchase Right granted, issued or sold on such initial Purchase Right or on any subsequent Purchase Right to be held similarly in abeyance) to the same extent as if there had been no such limitation). 


  
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 (b)    Fundamental Transaction. The Company shall not
enter into or be party to a Fundamental Transaction unless the Successor Entity assumes in writing all of the obligations of the Company under this Warrant in accordance with the provisions of this Section 4(b), including agreements to deliver
to the Holder in exchange for this Warrant a security of the Successor Entity evidenced by a written instrument substantially similar in form and substance to this Warrant, including, without limitation, which is exercisable for a corresponding
number of shares of capital stock equivalent to the shares of Common Stock acquirable and receivable upon exercise of this Warrant (without regard to any limitations on the exercise of this Warrant) prior to such Fundamental Transaction, and with an
exercise price which applies the exercise price hereunder to such shares of capital stock (but taking into account the relative value of the shares of Common Stock pursuant to such Fundamental Transaction and the value of such shares of capital
stock, such adjustments to the number of shares of capital stock and such exercise price being for the purpose of protecting the economic value of this Warrant immediately prior to the consummation of such Fundamental Transaction). Upon the
consummation of each Fundamental Transaction, the Successor Entity shall succeed to, and be substituted for the Company (so that from and after the date of the applicable Fundamental Transaction, the provisions of this Warrant and the other
Transaction Documents referring to the “Company” shall refer instead to the Successor Entity), and may exercise every right and power of the Company and shall assume all of the obligations of the Company under this Warrant with the same
effect as if such Successor Entity had been named as the Company herein. Upon consummation of each Fundamental Transaction, the Successor Entity shall deliver to the Holder confirmation that there shall be issued upon exercise of this Warrant at any
time after the consummation of the applicable Fundamental Transaction, in lieu of the shares of Common Stock (or other securities, cash, assets or other property (except such items still issuable under Sections 3 and 4(a) above, which shall continue
to be receivable thereafter)) issuable upon the exercise of this Warrant prior to the applicable Fundamental Transaction, such shares of common stock (or its equivalent) of the Successor Entity (including its Parent Entity) which the Holder would
have been entitled to receive upon the happening of the applicable Fundamental Transaction had this Warrant been exercised immediately prior to the applicable Fundamental Transaction (without regard to any limitations on the exercise of this
Warrant), as adjusted in accordance with the provisions of this Warrant. Notwithstanding the foregoing, and without limiting Section 1(f) hereof, the Holder may elect, at its sole option, by delivery of written notice to the Company to waive
this Section 4(b) to permit the Fundamental Transaction without the assumption of this Warrant. In addition to and not in substitution for any other rights hereunder, prior to the consummation of each Fundamental Transaction pursuant to which
holders of shares of Common Stock are entitled to receive securities or other assets with respect to or in exchange for shares of Common Stock (a “Corporate Event”), the Company shall make appropriate provision to insure that the Holder
will thereafter have the right to receive upon an exercise of this Warrant at any time after the consummation of the applicable Fundamental Transaction but prior to the Expiration Date, in lieu of the shares of the Common Stock (or other securities,
cash, assets or other property (except such items still issuable under Sections 3 and 4(a) above, which shall continue to be receivable thereafter)) issuable upon the exercise of the Warrant prior to such Fundamental Transaction, such shares of
stock, securities, cash, assets or any other property whatsoever (including warrants or other purchase or subscription rights) (collectively, the “Corporate Event Consideration”) which the Holder would have been entitled to receive upon
the happening of the applicable Fundamental Transaction had this Warrant been exercised immediately prior to the applicable Fundamental Transaction (without regard to 

  
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any limitations on the exercise of this Warrant). The provision made pursuant to the preceding sentence shall be in a form and substance reasonably satisfactory to the Holder. The provisions of
this Section 4(b) shall apply similarly and equally to successive Fundamental Transactions and Corporate Events. Notwithstanding the foregoing, in the event of a Change of Control, that is approved by the Company’s Board of Directors (and
not for avoidance of doubt if the Chang of Control is not within the Company’s control), the Holder shall be entitled to receive from the Company or any Successor Entity, as of the date of consummation of such Change of Control, the same type
or form of consideration (and in the same proportion), at the Black Scholes Value of the unexercised portion of this Warrant, that is being offered and paid to the holders of Common Stock of the Company in connection with the Change of Control,
whether that consideration be in the form of cash, stock or any combination thereof, or whether the holders of Common Stock are given the choice to receive from among alternative forms of consideration in connection with the Change of Control. 

5.    NONCIRCUMVENTION. The Company hereby covenants and agrees that the Company will not, by
amendment of its Certificate of Incorporation or Bylaws, or through any reorganization, transfer of assets, consolidation, merger, scheme of arrangement, dissolution, issuance or sale of securities, or any other voluntary action, avoid or seek to
avoid the observance or performance of any of the terms of this Warrant, and will at all times in good faith carry out all of the provisions of this Warrant and take all action as may be required to protect the rights of the Holder. Without limiting
the generality of the foregoing, the Company (i) shall not increase the par value of any shares of Common Stock receivable upon the exercise of this Warrant above the Exercise Price then in effect, (ii) shall take all such actions as may
be necessary or appropriate in order that the Company may validly and legally issue fully paid and nonassessable shares of Common Stock upon the exercise of this Warrant, and (iii) shall, so long as any of the Warrants are outstanding, take all
action necessary to reserve and keep available out of its authorized and unissued shares of Common Stock, solely for the purpose of effecting the exercise of the Warrants, the number of shares of Common Stock as shall from time to time be necessary
to effect the exercise of the Warrants then outstanding (without regard to any limitations on exercise). 

6.     WARRANT HOLDER NOT DEEMED A STOCKHOLDER. Except as otherwise specifically provided herein,
the Holder, solely in such Person’s capacity as a holder of this Warrant, shall not be entitled to vote or receive dividends or be deemed the holder of capital stock of the Company for any purpose, nor shall anything contained in this Warrant
be construed to confer upon the Holder, solely in such Person’s capacity as the Holder of this Warrant, 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 stock, consolidation, merger, conveyance or otherwise), receive notice of meetings, receive dividends or subscription rights, or otherwise, prior to the issuance to the Holder of the Warrant Shares
which such Person is then entitled to receive upon the due exercise of this Warrant. In addition, nothing contained in this Warrant shall be construed as imposing any liabilities on the Holder to purchase any securities (upon exercise of this
Warrant or otherwise) or as a stockholder of the Company, whether such liabilities are asserted by the Company or by creditors of the Company. Notwithstanding this Section 6, the Company shall provide the Holder with copies of the same notices
and other information given to the stockholders of the Company generally, contemporaneously with the giving thereof to the stockholders. 

  
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 7.     REISSUANCE OF WARRANTS. 

(a)    Transfer of Warrant. If this Warrant is to be transferred, the Holder shall surrender this
Warrant to the Company, whereupon the Company will forthwith issue and deliver upon the order of the Holder a new Warrant (in accordance with Section 7(d)), registered as the Holder may request, representing the right to purchase the number of
Warrant Shares being transferred by the Holder and, if less than the total number of Warrant Shares then underlying this Warrant is being transferred, a new Warrant (in accordance with Section 7(d)) to the Holder representing the right to
purchase the number of Warrant Shares not being transferred. 
 (b)    Lost, Stolen or Mutilated
Warrant. Upon receipt by the Company of evidence reasonably satisfactory to the Company of the loss, theft, destruction or mutilation of this Warrant, and, in the case of loss, theft or destruction, of any indemnification undertaking by the
Holder to the Company in customary form (but without the obligation to post a bond) and, in the case of mutilation, upon surrender and cancellation of this Warrant, the Company shall execute and deliver to the Holder a new Warrant (in accordance
with Section 7(d)) representing the right to purchase the Warrant Shares then underlying this Warrant. 

(c)    Exchangeable for Multiple Warrants. This Warrant is exchangeable, upon the surrender hereof
by the Holder at the principal office of the Company, for a new Warrant or Warrants (in accordance with Section 7(d)) representing in the aggregate the right to purchase the number of Warrant Shares then underlying this Warrant, and each such
new Warrant will represent the right to purchase such portion of such Warrant Shares as is designated by the Holder at the time of such surrender. 

(d)    Issuance of New Warrants. If this Warrant is not held in global form through DTC (or any
successor depository), whenever the Company is required to issue a new Warrant pursuant to the terms of this Warrant, such new Warrant (i) shall be of like tenor with this Warrant, (ii) shall represent, as indicated on the face of such new
Warrant, the right to purchase the Warrant Shares then underlying this Warrant (or in the case of a new Warrant being issued pursuant to Section 7(a) or Section 7(c), the Warrant Shares designated by the Holder which, when added to the
number of shares of Common Stock underlying the other new Warrants issued in connection with such issuance, does not exceed the number of Warrant Shares then underlying this Warrant), (iii) shall have an issuance date, as indicated on the face of
such new Warrant which is the same as the Issuance Date, and (iv) shall have the same rights and conditions as this Warrant. 

(e)    Warrant Register. If this Warrant is held in global form through DTC (or any successor
depository), the Warrant Agent shall register this Warrant, upon records to be maintained by the Warrant Agent for that purpose (the “Warrant Register”), in the name of the record Holder hereof from time to time. If this Warrant is
not held in global form through DTC (or any successor depository), the Company and the Warrant Agent may deem and treat the registered Holder of this Warrant as the absolute owner hereof for the purpose of any exercise hereof or any distribution to
the Holder, and for all other purposes, absent actual notice to the contrary. 
 8.     NOTICES.
Whenever notice is required to be given under this Warrant, including, without limitation, an Exercise Notice, unless otherwise provided herein, such notice shall be given in writing, (i) if delivered (a) from within the domestic United
States, by first-class 

  
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registered or certified airmail, or nationally recognized overnight express courier, postage prepaid, electronic mail or by facsimile or (b) from outside the United States, by International
Federal Express, electronic mail or facsimile, and (ii) will be deemed given (A) if delivered by first-class registered or certified mail domestic, three (3) Business Days after so mailed, (B) if delivered by nationally
recognized overnight carrier, one (1) Business Day after so mailed, (C) if delivered by International Federal Express, two (2) Business Days after so mailed and (D) on the date of transmission, if delivered by electronic mail to
each of the email addresses specified in this Section 8 prior to 5:00 p.m. (New York time) on a Trading Day, (E) the next Trading Day after the date of transmission, if delivered by electronic mail to each of the email addresses specified
in this Section 8 on a day that is not a Trading Day or later than 5:00 p.m. (New York time) on any Trading Day and (F) if delivered by facsimile, upon electronic confirmation of receipt of such facsimile, and will be delivered and
addressed as follows: 
 (i)    if to the Company, to: 

SELLAS Life Sciences Group, Inc. 

315 Madison Avenue, 4th Floor 

New York, NY 10017 

Attn: Gene Mack 

(ii) if to the Holder, at such address or other contact information delivered by the Holder to Company or as is on the books
and records of the Company. 
 The Company shall provide the Holder with prompt written notice of all actions taken pursuant to this
Warrant, including in reasonable detail a description of such action and the reason therefor. Without limiting the generality of the foregoing, the Company will give written notice to the Holder (i) immediately upon any adjustment of the
Exercise Price, setting forth in reasonable detail, and certifying, the calculation of such adjustment and (ii) at least fifteen (15) days prior to the date on which the Company closes its books or takes a record (A) with respect to
any dividend or distribution upon the shares of Common Stock, (B) with respect to any grants, issuances or sales of any Options, Convertible Securities or rights to purchase stock, warrants, securities or other property to holders of shares of
Common Stock or (C) for determining rights to vote with respect to any Fundamental Transaction, dissolution or liquidation; provided in each case that such information shall be made known to the public prior to or in conjunction with
such notice being provided to the Holder. It is expressly understood and agreed that the time of exercise specified by the Holder in each Exercise Notice shall be definitive and may not be disputed or challenged by the Company. 

9.     AMENDMENT AND WAIVER. Except as otherwise provided herein, the provisions of this Warrant
may be amended or waived and the Company may take any action herein prohibited, or omit to perform any act herein required to be performed by it, only if the Company has obtained the written consent of the Holder. 

10.     GOVERNING LAW; JURISDICTION; JURY TRIAL. This Warrant shall be governed by and construed
and enforced in accordance with, and all questions concerning the construction, validity, interpretation and performance of this Warrant shall be governed by, the internal laws of the State of New York, without giving effect to any choice of law or
conflict of 

  
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law provision or rule (whether of the State of New York or any other jurisdictions) that would cause the application of the laws of any jurisdictions other than the State of New York. The Company
hereby irrevocably submits to the exclusive jurisdiction of the state and federal courts sitting in The City of New York, Borough of Manhattan, for the adjudication of any dispute hereunder or in connection herewith or with any transaction
contemplated hereby or discussed herein, and hereby irrevocably waives, and agrees not to assert in any suit, action or proceeding, any claim that it is not personally subject to the jurisdiction of any such court, that such suit, action or
proceeding is brought in an inconvenient forum or that the venue of such suit, action or proceeding is improper. The Company hereby irrevocably waives personal service of process and consents to process being served in any such suit, action or
proceeding by mailing a copy thereof to the Company at the address set forth in Section 8(i) above or such other address as the Company subsequently delivers to the Holder and agrees that such service shall constitute good and sufficient
service of process and notice thereof. Nothing contained herein shall be deemed to limit in any way any right to serve process in any manner permitted by law. Nothing contained herein shall be deemed or operate to preclude the Holder from bringing
suit or taking other legal action against the Company in any other jurisdiction to collect on the Company’s obligations to the Holder, to realize on any collateral or any other security for such obligations, or to enforce a judgment or other
court ruling in favor of the Holder. If either party shall commence an action, suit or proceeding to enforce any provisions of this Warrant, the prevailing party in such action, suit or proceeding shall be reimbursed by the other party for their
reasonable attorneys’ fees and other costs and expenses incurred with the investigation, preparation and prosecution of such action or proceeding. THE COMPANY HEREBY IRREVOCABLY WAIVES ANY RIGHT IT MAY HAVE, AND AGREES NOT TO REQUEST, A JURY
TRIAL FOR THE ADJUDICATION OF ANY DISPUTE HEREUNDER OR IN CONNECTION WITH OR ARISING OUT OF THIS WARRANT OR ANY TRANSACTION CONTEMPLATED HEREBY. 

11.     DISPUTE RESOLUTION. In the case of a dispute as to the determination of the Exercise Price
or the arithmetic calculation of the Warrant Shares, the Company shall submit the disputed determinations or arithmetic calculations via facsimile or electronic mail within two (2) Business Days of receipt of the Exercise Notice or other event
giving rise to such dispute, as the case may be, to the Holder. If the Holder and the Company are unable to agree upon such determination or calculation of the Exercise Price or the Warrant Shares within three (3) Business Days of such disputed
determination or arithmetic calculation being submitted to the Holder, then the Company shall, within two (2) Business Days submit via facsimile or electronic mail (a) the disputed determination of the Exercise Price to an independent,
reputable investment bank selected by the Company and approved by the Holder or (b) the disputed arithmetic calculation of the Warrant Shares to the Company’s independent, outside accountant. The Company shall cause at its expense the
investment bank or the accountant, as the case may be, to perform the determinations or calculations and notify the Company and the Holder of the results no later than ten (10) Business Days from the time it receives the disputed determinations
or calculations. Such investment bank’s or accountant’s determination or calculation, as the case may be, shall be binding upon all parties absent demonstrable error. 

12.     REMEDIES, OTHER OBLIGATIONS, BREACHES AND INJUNCTIVE RELIEF. The remedies provided in this
Warrant shall be cumulative and in addition to all other remedies available under this Warrant and any other Transaction Documents, at law or in equity (including a decree of specific performance and/or other injunctive relief), and nothing herein
shall 

  
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limit the right of the Holder to pursue actual damages for any failure by the Company to comply with the terms of this Warrant. The Company acknowledges that a breach by it of its obligations
hereunder will cause irreparable harm to the Holder and that the remedy at law for any such breach may be inadequate. The Company therefore agrees that, in the event of any such breach or threatened breach, the holder of this Warrant shall be
entitled, in addition to all other available remedies, to an injunction restraining any breach, without the necessity of showing economic loss and without any bond or other security being required. Notwithstanding the foregoing or anything else
herein to the contrary, other than as expressly provided in Section 1(a), Section 1(c) or Section 4(b) hereof, if the Company is for any reason unable to issue and deliver Warrant Shares upon exercise of this Warrant as required
pursuant to the terms hereof, the Company shall have no obligation to pay to the holder any cash or other consideration or otherwise “net cash settle” this Warrant; provided that the foregoing shall not limit or supersede the applicability
of Section 4(b) hereof. 
 13.     TRANSFER. This Warrant and the Warrant Shares may be
offered for sale, sold, transferred, pledged or assigned without the consent of the Company. 
 14.    
SEVERABILITY; CONSTRUCTION; HEADINGS. If any provision of this Warrant is prohibited by law or otherwise determined to be invalid or unenforceable by a court of competent jurisdiction, the provision that would otherwise be prohibited, invalid
or unenforceable shall be deemed amended to apply to the broadest extent that it would be valid and enforceable, and the invalidity or unenforceability of such provision shall not affect the validity of the remaining provisions of this Warrant so
long as this Warrant as so modified continues to express, without material change, the original intentions of the parties as to the subject matter hereof and the prohibited nature, invalidity or unenforceability of the provision(s) in question does
not substantially impair the respective expectations or reciprocal obligations of the parties or the practical realization of the benefits that would otherwise be conferred upon the parties. The parties will endeavor in good faith negotiations to
replace the prohibited, invalid or unenforceable provision(s) with a valid provision(s), the effect of which comes as close as possible to that of the prohibited, invalid or unenforceable provision(s). This Warrant shall be deemed to be jointly
drafted by the Company and the Holder and shall not be construed against any Person as the drafter hereof. The headings of this Warrant are for convenience of reference and shall not form part of, or affect the interpretation of, this Warrant. 

15.    DISCLOSURE. Upon receipt or delivery by the Company of any notice in accordance with the
terms of this Warrant, unless the Company has in good faith determined that the matters relating to such notice do not constitute material, nonpublic information relating to the Company or its subsidiaries, the Company shall contemporaneously with
any such receipt or delivery publicly disclose such material, nonpublic information on a Current Report on Form 8-K or otherwise. In the event that the Company believes that a notice contains material,
nonpublic information relating to the Company or its subsidiaries, the Company so shall indicate to such Holder contemporaneously with delivery of such notice, and in the absence of any such indication, the Holder shall be allowed to presume that
all matters relating to such notice do not constitute material, nonpublic information relating to the Company or its subsidiaries. 

  
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 16.    WARRANT AGENT AGREEMENT. If this Warrant is
held in global form through DTC (or any successor depositary), this Warrant is issued subject to the Warrant Agent Agreement. To the extent any provision of this Warrant conflicts with the express provisions of the Warrant Agent Agreement, the
provisions of this Warrant shall govern and be controlling. 
 17.     CERTAIN DEFINITIONS. For
purposes of this Warrant, the following terms shall have the following meanings: 

(a)    “Affiliate” means, with respect to any Person, any other Person that directly or
indirectly controls, is controlled by, or is under common control with, such Person, it being understood for purposes of this definition that “control” of a Person means the power directly or indirectly either to vote 10% or more of the
stock having ordinary voting power for the election of directors of such Person or direct or cause the direction of the management and policies of such Person whether by contract or otherwise. 

(b)    “Attribution Parties” means, collectively, the following Persons and entities:
(i) any investment vehicle, including, any funds, feeder funds or managed accounts, currently, or from time to time after the Subscription Date, directly or indirectly managed or advised by the Holder’s investment manager or any of its
Affiliates or principals, (ii) any direct or indirect Affiliates of the Holder or any of the foregoing, (iii) any Person acting or who could be deemed to be acting as a Group together with the Holder or any of the foregoing and
(iv) any other Persons whose beneficial ownership of the Company’s Common Stock would or could be aggregated with the Holder’s and the other Attribution Parties for purposes of Section 13(d) of the 1934 Act. For clarity, the
purpose of the foregoing is to subject collectively the Holder and all other Attribution Parties to the Maximum Percentage. 

(c)     “Bid Price” means, for any security as of the particular time of determination,
the bid price for such security on the Principal Market as reported by Bloomberg as of such time of determination, or, if the Principal Market is not the principal securities exchange or trading market for such security, the bid price of such
security on the principal securities exchange or trading market where such security is listed or traded as reported by Bloomberg as of such time of determination, or if the foregoing does not apply, the bid price of such security in the over-the-counter market on the electronic bulletin board for such security as reported by Bloomberg as of such time of determination, or, if no bid price is reported for such
security by Bloomberg as of such time of determination, the average of the bid prices of any market makers for such security as reported in the “pink sheets” by OTC Markets Group Inc. (formerly Pink Sheets LLC) as of such time of
determination. If the Bid Price cannot be calculated for a security as of the particular time of determination on any of the foregoing bases, the Bid Price of such security as of such time of determination shall be the fair market value as mutually
determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the fair market value of such security, then such dispute shall be resolved in accordance with the procedures in Section 11. All such
determinations shall be appropriately adjusted for any stock dividend, stock split, stock combination or other similar transaction during such period. 

“Black Scholes Value” means the value of this Warrant based on the Black-Scholes Option Pricing Model
obtained from the “OV” function on Bloomberg determined as of the day immediately following the first public announcement of the applicable Change of Control, or, if the Change of Control is not publicly announced, the date the Change of
Control is consummated, for pricing purposes and reflecting (i) a risk-free interest rate corresponding to the 

  
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U.S. Treasury rate for a period equal to the remaining term of this Warrant as of such date of request, (ii) an expected volatility equal to the lesser of (x) 100% and (y) the
volatility obtained from the HVT function on Bloomberg for the 30 Trading Day period beginning with the First Trading Day immediately following the public announcement of the applicable Change of Control, (iii) the underlying price per share
used in such calculation shall be the greater of (a) the highest Weighted Average Price during the five (5) Trading Days prior to the closing of the Change of Control and (b) the sum of the price per share being offered in cash, if
any, plus the value of any non-cash consideration, if any, being offered in such Change of Control, (iv) a zero cost of borrow and (v) a 360 day annualization factor. 

(d)    “Bloomberg” means Bloomberg Financial Markets. 

(e)    “Business Day” means any day other than Saturday, Sunday or other day on which
commercial banks in The City of New York are authorized or required by law to remain closed. 

(f)    “Change of Control” means any Fundamental Transaction other than (i) any
reorganization, recapitalization or reclassification of the Common Stock in which holders of the Company’s voting power immediately prior to such reorganization, recapitalization or reclassification continue after such reorganization,
recapitalization or reclassification to hold publicly traded securities and, directly or indirectly, are, in all material respect, the holders of the voting power of the surviving entity (or entities with the authority or voting power to elect the
members of the board of directors (or their equivalent if other than a corporation) of such entity or entities) after such reorganization, recapitalization or reclassification, (ii) pursuant to a migratory merger effected solely for the purpose
of changing the jurisdiction of incorporation of the Company or (iii) a merger in connection with a bona fide acquisition by the Company of any Person in which (x) the gross consideration paid, directly or indirectly, by the Company in
such acquisition is not greater than 20% of the Company’s market capitalization as calculated on the date of the consummation of such merger and (y) such merger does not contemplate a change to the identity of a majority of the board of
directors of the Company. Notwithstanding anything herein to the contrary, any transaction or series of transaction that, directly or indirectly, results in the Company or the Successor Entity not having Common Stock or common stock, as applicable,
registered under the 1934 Act and listed on an Eligible Market shall be deemed a Change of Control. 

(g)    “Closing Bid Price” and “Closing Sale Price” means, for any
security as of any date, the last closing bid price and last closing trade price, respectively, for such security on the Principal Market, as reported by Bloomberg, or, if the Principal Market begins to operate on an extended hours basis and does
not designate the closing bid price or the closing trade price, as the case may be, then the last bid price or the last trade price, respectively, of such security prior to 4:00:00 p.m., New York time, as reported by Bloomberg, or, if the Principal
Market is not the principal securities exchange or trading market for such security, the last closing bid price or last trade price, respectively, of such security on the principal securities exchange or trading market where such security is listed
or traded as reported by Bloomberg, or if the foregoing do not apply, the last closing bid price or last trade price, respectively, of such security in the
over-the-counter market on the electronic bulletin board for such security as reported by Bloomberg, or, if no closing bid price or last trade price, respectively, is
reported for such security by Bloomberg, the average 

  
 - 21 - 








 
of the bid prices, or the ask prices, respectively, of any market makers for such security as reported in the OTC Link or “pink sheets” by OTC Markets Group Inc. (formerly Pink OTC
Markets Inc.). If the Closing Bid Price or the Closing Sale Price cannot be calculated for a security on a particular date on any of the foregoing bases, the Closing Bid Price or the Closing Sale Price, as the case may be, of such security on such
date shall be the fair market value as mutually determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the fair market value of such security, then such dispute shall be resolved pursuant to Section 11.
All such determinations to be appropriately adjusted for any stock dividend, stock split, stock combination, reclassification or other similar transaction during the applicable calculation period. 

(h)    “Common Stock” means (i) the Company’s Common Stock, par value $0.0001
per share, and (ii) any capital stock into which such Common Stock shall have been changed or any capital stock resulting from a reclassification of such Common Stock. 

(i)    “Convertible Securities” means any stock or securities (other than Options)
directly or indirectly convertible into or exercisable or exchangeable for shares of Common Stock. 

(j)    “Eligible Market” means The NASDAQ Capital Market, the NYSE American LLC, The
NASDAQ Global Select Market, The NASDAQ Global Market or The New York Stock Exchange, Inc. 

(k)    “Expiration Date” means the date sixty (60) months after the Initial
Exercisability Date or, if such date falls on a day other than a Business Day or on which trading does not take place on the Principal Market (a “Holiday”), the next day that is not a Holiday. 

(l)    “Fundamental Transaction” means (A) that the Company shall, directly or
indirectly, including through subsidiaries, Affiliates or otherwise, in one or more related transactions, (i) consolidate or merge with or into (whether or not the Company is the surviving corporation) another Subject Entity, or (ii) sell,
assign, transfer, convey or otherwise dispose of all or substantially all of the properties or assets of the Company or any of its “significant subsidiaries” (as defined in Rule 1-02 of Regulation S-X) to one or more Subject Entities, or (iii) make, or allow one or more Subject Entities to make, or allow the Company to be subject to or have its shares of Common Stock be subject to or party to one or more
Subject Entities making, a purchase, tender or exchange offer that is accepted by the holders of at least either (x) 50% of the outstanding shares of Common Stock, (y) 50% of the outstanding shares of Common Stock calculated as if any shares of
Common Stock held by all Subject Entities making or party to, or Affiliated with any Subject Entities making or party to, such purchase, tender or exchange offer were not outstanding; or (z) such number of shares of Common Stock such that all
Subject Entities making or party to, or Affiliated with any Subject Entity making or party to, such purchase, tender or exchange offer, become collectively the beneficial owners (as defined in Rule 13d-3 under
the 1934 Act) of at least 50% of the outstanding shares of Common Stock, or (iv) consummate a stock purchase agreement or other business combination (including, without limitation, a reorganization, recapitalization, spin-off or scheme of arrangement) with one or more Subject Entities whereby all such Subject Entities, individually or in the aggregate, acquire, either (x) at least 50% of the outstanding shares of Common
Stock, (y) at least 50% of the outstanding shares of Common Stock calculated as if any shares of Common Stock held by all the Subject Entities making or party to, or Affiliated with 

  
 - 22 - 








 
any Subject Entity making or party to, such stock purchase agreement or other business combination were not outstanding; or (z) such number of shares of Common Stock such that the Subject
Entities become collectively the beneficial owners (as defined in Rule 13d-3 under the 1934 Act) of at least 50% of the outstanding shares of Common Stock, or (v) reorganize, recapitalize or reclassify
its shares of Common Stock, (B) that the Company shall, directly or indirectly, including through subsidiaries, Affiliates or otherwise, in one or more related transactions, allow any Subject Entity individually or the Subject Entities in the
aggregate to be or become the “beneficial owner” (as defined in Rule 13d-3 under the 1934 Act), directly or indirectly, whether through acquisition, purchase, assignment, conveyance, tender, tender
offer, exchange, reduction in outstanding shares of Common Stock, merger, consolidation, business combination, reorganization, recapitalization, spin-off, scheme of arrangement, reorganization,
recapitalization or reclassification or otherwise in any manner whatsoever, of either (x) at least 50% of the aggregate ordinary voting power represented by issued and outstanding shares of Common Stock, (y) at least 50% of the aggregate
ordinary voting power represented by issued and outstanding shares of Common Stock not held by all such Subject Entities as of the Subscription Date calculated as if any shares of Common Stock held by all such Subject Entities were not outstanding,
or (z) a percentage of the aggregate ordinary voting power represented by issued and outstanding shares of Common Stock or other equity securities of the Company sufficient to allow such Subject Entities to effect a statutory short form merger
or other transaction requiring other stockholders of the Company to surrender their Common Stock without approval of the stockholders of the Company or (C) directly or indirectly, including through subsidiaries, Affiliates or otherwise, in one
or more related transactions, the issuance of or the entering into any other instrument or transaction structured in a manner to circumvent, or that circumvents, the intent of this definition in which case this definition shall be construed and
implemented in a manner otherwise than in strict conformity with the terms of this definition to the extent necessary to correct this definition or any portion of this definition which may be defective or inconsistent with the intended treatment of
such instrument or transaction. 
 (m)    “Group” means a “group” as that
term is used in Section 13(d) of the 1934 Act and as defined in Rule 13d-5 thereunder. 

(n)    “Options” means any rights, warrants or options to subscribe for or purchase
shares of Common Stock or Convertible Securities. 
 (o)    “Parent Entity” of a
Person means an entity that, directly or indirectly, controls the applicable Person, including such entity whose common stock or equivalent equity security is quoted or listed on an Eligible Market (or, if so elected by the Holder, any other market,
exchange or quotation system), or, if there is more than one such Person or such entity, the Person or such entity designated by the Holder or in the absence of such designation, such Person or entity with the largest public market capitalization as
of the date of consummation of the Fundamental Transaction. 
 (p)    “Person” means
an individual, a limited liability company, a partnership, a joint venture, a corporation, a trust, an unincorporated organization, any other entity and a government or any department or agency thereof. 

  
 - 23 - 








 (q)    “Principal Market” means the
principal securities exchange or securities market on which the Common Shares are then traded. 

(r)    “Required Holders” means the holders of the Warrants representing at least a
majority of the shares of Common Stock underlying the Warrants then outstanding. 

(s)    “Standard Settlement Period” means the standard settlement period, expressed in a
number of Trading Days, for the Company’s primary trading market or quotation system with respect to the Common Stock that is in effect on the date of receipt of an applicable Exercise Notice. 

(t)    “Subject Entity” means any Person, Persons or Group or any Affiliate or associate
of any such Person, Persons or Group. 
 (u)    “Successor Entity” means one or more
Person or Persons (or, if so elected by the Holder, the Company or Parent Entity) formed by, resulting from or surviving any Fundamental Transaction or one or more Person or Persons (or, if so elected by the Holder, the Company or the Parent Entity)
with which such Fundamental Transaction shall have been entered into. 
 (v)    “Trading
Day” means any day on which the Common Stock is traded on the Principal Market, or, if the Principal Market is not the principal trading market for the Common Stock, then on the principal securities exchange or securities market on which
the Common Stock is then traded. 
 (w)    “Transaction Documents” means any agreement
entered into by and between the Company and the Holder, as applicable. 
 (x)    “Warrant Agent
Agreement” means that certain Warrant Agent Agreement, dated as of the Initial Exercise Date, between the Company and the Warrant Agent.

(y)    “Warrant Agent” means Computershare Inc., a Delaware corporation, and its
wholly-owned subsidiary, Computershare Trust Company, N.A., a federally chartered trust company. 

(z)    “Weighted Average Price” means, for any security as of any date, the dollar
volume-weighted average price for such security on the Principal Market during the period beginning at 9:30:01 a.m., New York time (or such other time as the Principal Market publicly announces is the official open of trading), and ending at 4:00:00
p.m., New York time (or such other time as the Principal Market publicly announces is the official close of trading), as reported by Bloomberg through its “Volume at Price” function or, if the foregoing does not apply, the dollar
volume-weighted average price of such security in the over-the-counter market on the electronic bulletin board for such security during the period beginning at 9:30:01
a.m., New York time (or such other time as such market publicly announces is the official open of trading), and ending at 4:00:00 p.m., New York time (or such other time as such market publicly announces is the official close of trading), as
reported by Bloomberg, or, if no dollar volume-weighted average price is reported for such security by Bloomberg for such hours, the average of the highest Closing Bid Price and the lowest closing ask price of any of the market makers for such
security as reported in 

  
 - 24 - 








 
the OTC Link or “pink sheets” by OTC Markets Group Inc. (formerly Pink OTC Markets Inc.). If the Weighted Average Price cannot be calculated for a security on a particular date on any
of the foregoing bases, the Weighted Average Price of such security on such date shall be the fair market value as mutually determined by the Company and the Holder. If the Company and the Holder are unable to agree upon the fair market value of
such security, then such dispute shall be resolved pursuant to Section 11 with the term “Weighted Average Price” being substituted for the term “Exercise Price.” All such determinations shall be appropriately adjusted for
any stock dividend, stock split, stock combination, reclassification or other similar transaction during the applicable calculation period. 

[Signature Page Follows] 

  
 - 25 - 








 IN WITNESS WHEREOF, the Company has caused this Warrant to Purchase Common
Stock to be duly executed as of the Issuance Date set out above. 
  

			
	 SELLAS LIFE SCIENCES GROUP, INC.

		
	 By:
	 	
                  
   

	 Name:
	 	
	 Title:
	 	









 EXHIBIT A 

EXERCISE NOTICE 
 TO BE
EXECUTED BY THE REGISTERED HOLDER TO EXERCISE THIS 
 WARRANT TO PURCHASE COMMON STOCK 

SELLAS LIFE SCIENCES GROUP, INC. 

The undersigned holder hereby exercises the right to purchase
                     shares of Common Stock (“Warrant Shares”) of SELLAS Life Sciences Group, Inc., a company organized under
the laws of Delaware (the “Company”), evidenced by the attached Warrant to Purchase Common Stock (the “Warrant”). Capitalized terms used herein and not otherwise defined shall have the respective meanings set forth
in the Warrant. 
 1. Form of Exercise Price. The Holder intends that payment of the Exercise Price shall be made as: 

                    
     a “Cash Exercise” with respect to
                             Warrant Shares; and/or 

                    
     a “Cashless Exercise” with respect to                          Warrant
Shares. 
 2. Payment of Exercise Price. In the event that the holder has elected a Cash Exercise with respect to some or
all of the Warrant Shares to be issued pursuant hereto, the holder shall pay the Aggregate Exercise Price in the sum of $                    
to the Company in accordance with the terms of the Warrant. 
 3. Delivery of Warrant Shares. The Company shall deliver to
the holder                      Warrant Shares in accordance with the terms of the Warrant. 

 

			
	 Date:             ,
        

	
	  

	 Name of Registered Holder

		
	 By:
	 	  

	 Name:
	 	
	 Title:
	 	








 ACKNOWLEDGMENT 

The Company hereby acknowledges this Exercise Notice and hereby directs [TRANSFER AGENT] to issue the above indicated number
of shares of Common Stock on or prior to the applicable Share Delivery Date. 
  

			
	SELLAS LIFE SCIENCES GROUP, INC.
		
	 By:
	 	  

	 Name:
	 	
	 Title:
	 	









 Exhibit C 

Form of Warrant Certificate Request Notice 

WARRANT CERTIFICATE REQUEST NOTICE 

To: Computer Share Inc. as Warrant Agent for SELLAS Life Sciences Group, Inc. (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 Definitive 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 Definitive 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 Definitive Certificate shall be issued:
                               



	5.	 Number of Warrants in name of Holder in form of Global Warrants after issuance of Definitive Certificate, if
any:                      



	6.	 Definitive 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 Definitive 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 Definitive Certificate. 
  

			
	 [SIGNATURE OF HOLDER]
	 	
		
	 Name of Investing Entity:
	 	  

		
	 Signature of Authorized Signatory of Investing Entity:
	 	  

		
	 Name of Authorized Signatory:
	 	  

		
	 Title of Authorized Signatory:
	 	  

		
	 Date: