EX-10.15



 Exhibit 10.15 

THIS WARRANT AND THE SHARES ISSUABLE HEREUNDER HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR THE
SECURITIES LAWS OF ANY STATE AND, EXCEPT AS SET FORTH IN SECTIONS 5.3 AND 5.4 BELOW, MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED UNLESS AND UNTIL REGISTERED UNDER SAID ACT AND LAWS OR, IN THE OPINION OF LEGAL COUNSEL IN FORM AND
SUBSTANCE SATISFACTORY TO THE COMPANY, SUCH OFFER, SALE, PLEDGE OR OTHER TRANSFER IS EXEMPT FROM SUCH REGISTRATION. 
 WARRANT TO PURCHASE
STOCK 
 (Term B Loan) 
  

			
	Company:	  	Constellation Pharmaceuticals, Inc., a Delaware corporation
	Number of Shares:	  	75,000
	Type/Series of Stock:	  	Series B Preferred
	Warrant Price:	  	$1.20 per share
	Issue Date:	  	September 30, 2014
	Expiration Date:	  	September 30, 2024 See also Section 5.1(b).
	Credit Facility:	  	This Warrant to Purchase Stock (“Warrant”) is issued in connection with that certain Loan and Security Agreement dated June 28, 2013, among Oxford Finance LLC, as Lender and Collateral Agent, the Lenders from
time to time party thereto, including Silicon Valley Bank and the Company (as modified, amended and/or restated from time to time, the “Loan Agreement”).

 THIS WARRANT CERTIFIES THAT, for good and valuable consideration, (i) OXFORD FINANCE LLC
(“Oxford” and, together with any successor or permitted assignee or transferee of this Warrant or of any shares issued upon exercise hereof, “Holder”) has previously delivered to the above-named company (the
“Company”) a duly executed signature page to a Stockholder Option and Support Agreement with Genentech, Inc., a Delaware corporation, in the form attached as Appendix 1 to the Warrant to Purchase Stock issued by the Company to Oxford on
June 28, 2013 (an “Option and Support Agreement”), (ii) Holder is entitled to purchase the above-stated number of fully paid and non-assessable shares (the “Shares”) of
the above-stated Type/Series of Stock (the “Class”) of the Company at the above-stated Warrant Price, all as set forth above and as adjusted pursuant to Section 2 of this Warrant, subject to the provisions and upon the terms
and conditions set forth in this Warrant and (iii) this Warrant and the Shares, when issued, are and shall be subject to the terms and conditions of the Option and Support Agreement. FOR CLARIFICATION, THE COMPANY AGREES THAT THE OPTION AND
SUPPORT AGREEMENT HAS BEEN SIGNED BY HOLDER SOLELY IN ITS CAPACITY AS A HOLDER OF EQUITY SECURITIES OF THE COMPANY AND NOT AS A LENDER OR COLLATERAL AGENT. THE COMPANY AGREES THAT SUCH OPTION AND SUPPORT AGREEMENT SHALL NOT BIND HOLDER OR ANY OF ITS
AFFILIATES IN HOLDER’S OR SUCH AFFILIATE’S CAPACITY AS A LENDER OR COLLATERAL AGENT IN ANY WAY, NOR SHALL IT AFFECT OR IN ANY WAY IMPAIR ANY RIGHTS OR REMEDIES THAT HOLDER OR ITS AFFILIATE MAY HAVE WITH RESPECT TO HOLDER’S OR SUCH
AFFILIATE’S LOAN FACILITY WITH THE COMPANY. The two preceding sentences are not intended to impair Genentech, Inc.’s rights with respect to the equity securities as covered by the Option and Support Agreement. 

 
 SECTION 1. EXERCISE. 

1.1 Method of Exercise. Holder may at any time and from time to time exercise this Warrant, in whole or in part, by delivering to the
Company the original of this Warrant together with a duly executed Notice of Exercise in substantially the form attached hereto as Appendix 1 and, unless Holder is exercising this Warrant pursuant to a cashless exercise set forth in
Section 1.2, a check, wire transfer of same-day funds (to an account designated by the Company), or other form of payment acceptable to the Company for the aggregate Warrant Price for the Shares being
purchased. 
 1.2 Cashless Exercise. On any exercise of this Warrant, in lieu of payment of the aggregate Warrant Price in the manner
as specified in Section 1.1 above, but otherwise in accordance with the requirements of Section 1.1, Holder may elect to receive Shares equal to the value of this Warrant, or portion hereof as to which this Warrant is being exercised.
Thereupon, the Company shall issue to the Holder such number of fully paid and non-assessable Shares as are computed using the following formula: 

  
 1 








 X = Y(A-B)/A 

where: 
  

			
		
	 X =
	  	the number of Shares to be issued to the Holder;
		
	 Y =
	  	the number of Shares with respect to which this Warrant is being exercised (inclusive of the Shares surrendered to the Company in payment of the aggregate Warrant Price);
		
	 A =
	  	the Fair Market Value (as determined pursuant to Section 1.3 below) of one Share; and
		
	 B =
	  	the Warrant Price.

 1.3 Fair Market Value. If the Company’s common stock is then traded or quoted on a nationally
recognized securities exchange, inter-dealer quotation system or over-the-counter market (a “Trading Market”) and the Class is common stock, the
fair market value of a Share shall be the closing price or last sale price of a share of common stock reported for the Business Day immediately before the date on which Holder delivers this Warrant together with its Notice of Exercise to the
Company. If the Company’s common stock is then traded in a Trading Market and the Class is a series of the Company’s convertible preferred stock, the fair market value of a Share shall be the closing price or last sale price of a
share of the Company’s common stock reported for the Business Day immediately before the date on which Holder delivers this Warrant together with its Notice of Exercise to the Company multiplied by the number of shares of the Company’s
common stock into which a Share is then convertible. If the Company’s common stock is not traded in a Trading Market, the Board of Directors of the Company shall determine the fair market value of a Share in its reasonable good faith judgment.

 1.4 Delivery of Certificate and New Warrant. Within a reasonable time after Holder exercises this Warrant in the manner set forth
in Section 1.1 or 1.2 above, the Company shall deliver to Holder a certificate representing the Shares issued to Holder upon such exercise and, if this Warrant has not been fully exercised and has not expired, a new warrant of like tenor
representing the Shares not so acquired (or surrendered pursuant to Section 1.2 to the extent applicable). 
 1.5 Replacement of
Warrant. On receipt 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, on delivery of an indemnity agreement reasonably satisfactory in
form, substance and amount to the Company or, in the case of mutilation, on surrender of this Warrant to the Company for cancellation, the Company shall, within a reasonable time, execute and deliver to Holder, in lieu of this Warrant, a new warrant
of like tenor and amount. 
 1.6 Treatment of Warrant Upon Acquisition of Company. 

(a) Acquisition. For the purpose of this Warrant, “Acquisition” means any transaction or series of related transactions
involving: (i) the sale, lease, exclusive license, or other disposition of all or substantially all of the assets of the Company (ii) any merger or consolidation of the Company into or with another person or entity (other than a merger or
consolidation effected exclusively to change the Company’s domicile), or any other corporate reorganization, in which the stockholders of the Company in their capacity as such immediately prior to such merger, consolidation or reorganization,
own less than a majority of the Company’s (or the surviving or successor entity’s) outstanding voting power immediately after such merger, consolidation or reorganization (or, if such Company stockholders beneficially own a majority of the
outstanding voting power of the surviving or successor entity as of immediately after such merger, consolidation or reorganization, such surviving or successor entity is not the Company); or (iii) any sale or other transfer by the stockholders
of the Company of shares representing at least a majority of the Company’s then-total outstanding combined voting power. 

  
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 (b) Treatment of Warrant at Acquisition. In the event of an Acquisition in which the
consideration to be received by the Company’s stockholders consists solely of cash, solely of Marketable Securities or a combination of cash and Marketable Securities (a “Cash/Public Acquisition”), either (i) Holder shall
exercise this Warrant pursuant to Section 1.1 and/or 1.2 and such exercise will be deemed effective immediately prior to and contingent upon the consummation of such Acquisition or (ii) if Holder elects not to exercise the Warrant, this
Warrant will expire immediately prior to the consummation of such Acquisition. 
 (c) The Company shall provide Holder with written notice of
a contemplated Cash/Public Acquisition (together with such reasonable information as Holder may reasonably require regarding the treatment of this Warrant in connection with such contemplated Cash/Public Acquisition giving rise to such notice),
which is to be delivered to Holder not less than seven (7) Business Days prior to the closing of the proposed Cash/Public Acquisition. In the event the Company does not provide such notice, then if, immediately prior to the Cash/Public
Acquisition, the fair market value of one Share (or other security issuable upon the exercise hereof) as determined in accordance with Section 1.3 above would be greater than the Warrant Price in effect on such date, then this Warrant shall
automatically be deemed on and as of such date to be exercised pursuant to Section 1.2 above as to all Shares (or such other securities) for which it shall not previously have been exercised, and the Company shall promptly notify the Holder of
the number of Shares (or such other securities) issued upon such exercise to the Holder and Holder shall be deemed to have restated each of the representations and warranties in Section 4 of the Warrant as the date thereof. 

(d) Upon the closing of any Acquisition other than a Cash/Public Acquisition defined above, the acquiring, surviving or successor entity shall
assume the obligations of this Warrant, and this Warrant shall thereafter be exercisable for the same securities and/or other property as would have been paid for the Shares issuable upon exercise of the unexercised portion of this Warrant as if
such Shares were outstanding on and as of the closing of such Acquisition, subject to further adjustment from time to time in accordance with the provisions of this Warrant. 

(e) As used in this Warrant, “Marketable Securities” means securities meeting all of the following requirements: (i) the
issuer thereof is then subject to the reporting requirements of Section 13 or Section 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and is then current in its filing of all required reports
and other information under the Act and the Exchange Act; (ii) the class and series of shares or other security of the issuer that would be received by Holder in connection with the Acquisition were Holder to exercise this Warrant on or prior
to the closing thereof is then traded in a Trading Market, and (iii) Holder would be able to publicly re-sell, within six (6) months and one (1) day following the closing of such Acquisition,
all of the issuer’s shares and/or other securities that would be received by Holder in such Acquisition were Holder to exercise this Warrant in full on or prior to the closing of such Acquisition. 

(f) Genentech Acquisition. Notwithstanding anything to the contrary contained in this Warrant, in the event the Genentech Acquisition
(as defined in the Loan Agreement) is consummated as a merger pursuant to the Agreement and Plan of Merger dated January 9, 2012 among the Company, Genentech, Inc. and the other parties thereto (the “Merger Agreement”), this
Warrant shall be treated in accordance with the terms of Section 8.8(c) of the Merger Agreement. 
 1.7 Adjustment to
Class of Shares; Number of Shares; Warrant Price; Adjustments Cumulative. In the event of a preferred stock equity financing by the Company after the Issue Date the gross proceeds of which equal at least One Million Dollars
($1,000,000) (the “Next Round”), if the price per share (the “Next Round Price”) of such shares of preferred stock (the “Next Round Stock”) is less than the Warrant Price, this Warrant shall,
instead of being exercisable for the above-stated Shares at the above-stated Warrant Price, be exercisable, automatically and without further action by Holder, for Shares of the Next Round Stock at the Next Round Price (with the number of such
shares subject of this Warrant automatically adjusted to equal (i) the aggregate Number of Shares for which this Warrant is then exercisable (as adjusted hereunder, but before giving effect to this Section 1.7) multiplied by (ii) the
quotient of (x) the Warrant Price divided by (y) the Next Round Price). The rights set forth in this Section 1.7 shall (i) only apply to the first Next Round that occurs after the Issue Date and shall not apply to any other
financing and (ii) shall terminate (x), in the case of the occurrence of an Acquisition, then upon the satisfaction of the provisions of Section 1.6 hereof and (y) in the case of the occurrence of an IPO (defined below), then upon the
satisfaction of Section 2.3 hereof. Any adjustment to the Class of Shares, Number of Shares and/or Warrant Price made as a result of this Article 1.7 shall be in addition to any adjustment(s) to be made in accordance with Article 2 hereof.


  
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 SECTION 2. ADJUSTMENTS TO THE SHARES AND WARRANT PRICE. 

2.1 Stock Dividends, Splits, Etc. If the Company declares or pays a dividend or distribution on the outstanding shares of the
Class payable in common stock or other securities or property (other than cash), then upon exercise of this Warrant, for each Share acquired, Holder shall receive, without additional cost to Holder, the total number and kind of securities and
property which Holder would have received had Holder owned the Shares of record as of the date the dividend or distribution occurred. If the Company subdivides the outstanding shares of the Class by reclassification or otherwise into a greater
number of shares, the number of Shares purchasable hereunder shall be proportionately increased and the Warrant Price shall be proportionately decreased. If the outstanding shares of the Class are combined or consolidated, by reclassification
or otherwise, into a lesser number of shares, the Warrant Price shall be proportionately increased and the number of Shares shall be proportionately decreased. 

2.2 Reclassification, Exchange, Combinations or Substitution. Upon any event whereby all of the outstanding shares of the Class are
reclassified, exchanged, combined, substituted, or replaced for, into, with or by Company securities of a different class and/or series, then from and after the consummation of such event, this Warrant will be exercisable for the number, class and
series of Company securities that Holder would have received had the Shares been outstanding on and as of the consummation of such event, and subject to further adjustment thereafter from time to time in accordance with the provisions of this
Warrant. The provisions of this Section 2.2 shall similarly apply to successive reclassifications, exchanges, combinations substitutions, replacements or other similar events. 

2.3 Conversion of Preferred Stock. If the Class is a class and series of the Company’s convertible preferred stock, in the
event that all outstanding shares of the Class are converted, automatically or by action of the holders thereof, into common stock pursuant to the provisions of the Company’s Certificate of Incorporation, including, without limitation, in
connection with the Company’s initial, underwritten public offering and sale of its common stock pursuant to an effective registration statement under the Act (the “IPO”), then from and after the date on which all outstanding
shares of the Class have been so converted, this Warrant shall be exercisable for such number of shares of common stock into which the Shares would have been converted had the Shares been outstanding on the date of such conversion, and the
Warrant Price shall equal the Warrant Price in effect as of immediately prior to such conversion divided by the number of shares of common stock into which one Share would have been converted, all subject to further adjustment thereafter from time
to time in accordance with the provisions of this Warrant. 
 2.4 Adjustments for Diluting Issuances. Except as would duplicate any
adjustment otherwise provided for in this Section 2, the number of shares of common stock issuable upon conversion of the Shares shall be subject to anti-dilution adjustment from time to time in the manner set forth in the Company’s
Certificate of Incorporation as if the Shares were issued and outstanding on and as of the date of any such required adjustment. 
 2.5 No
Fractional Share. No fractional Share shall be issuable upon exercise of this Warrant and the number of Shares to be issued shall be rounded down to the nearest whole Share. If a fractional Share interest arises upon any exercise of the Warrant,
the Company shall eliminate such fractional Share interest by paying Holder in cash the amount computed by multiplying the fractional interest by (i) the fair market value (as determined in accordance with Section 1.3 above) of a full
Share, less (ii) the then-effective Warrant Price. 
 2.6 Notice/Certificate as to Adjustments. Upon each adjustment of the
Warrant Price, Class and/or number of Shares, the Company, at the Company’s expense, shall notify Holder in writing within a reasonable time setting forth the adjustments to the Warrant Price, Class and/or number of Shares and facts
upon which such adjustment is based. The Company shall, upon written request from Holder, furnish Holder with a certificate of its Chief Financial Officer, including computations of such adjustment and the Warrant Price, Class and number of
Shares in effect upon the date of such adjustment. 

  
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 SECTION 3. REPRESENTATIONS AND COVENANTS OF THE COMPANY. 

3.1 Representations and Warranties. The Company represents and warrants to, and agrees with, the Holder as follows: 

(a) The initial Warrant Price referenced on the first page of this Warrant is not greater than the price per share at which shares of the
Class were last sold and issued prior to the Issue Date hereof in an arms-length transaction in which at least $500,000 of such shares were sold. 

(b) All Shares which may be issued upon the exercise of this Warrant, and all securities, if any, issuable upon conversion of the Shares,
shall, upon issuance, be duly authorized, validly issued, fully paid and non-assessable, and free of any liens and encumbrances except for restrictions on transfer provided for herein or under applicable
federal and state securities laws. The Company covenants that it shall at all times cause to be reserved and kept available out of its authorized and unissued capital stock such number of shares of the Class, common stock and other securities as
will be sufficient to permit the exercise in full of this Warrant and the conversion of the Shares into common stock or such other securities. 

(c) The Company’s capitalization table attached hereto as Schedule 1 is true and complete, in all material respects, as of the Issue Date.

 3.2 Notice of Certain Events. If the Company proposes at any time to: 

(a) declare any dividend or distribution upon the outstanding shares of the Class or common stock, whether in cash, property, stock, or
other securities and whether or not a regular cash dividend; 
 (b) offer for subscription or sale pro rata to the holders of the outstanding
shares of the Class any additional shares of any class or series of the Company’s stock (other than pursuant to contractual pre-emptive rights); 

(c) effect any reclassification, exchange, combination, substitution, reorganization or recapitalization of the outstanding shares of the
Class; 
 (d) effect an Acquisition or to liquidate, dissolve or wind up; or 

(e) effect an IPO; 
 then, in connection with each
such event, the Company shall give Holder: 
 (1) at least seven (7) Business Days prior written notice of the date on which a record
will be taken for such dividend, distribution, or subscription rights (and specifying the date on which the holders of outstanding shares of the Class will be entitled thereto) or for determining rights to vote, if any, in respect of the
matters referred to in (a) and (b) above; 
 (2) in the case of the matters referred to in (c) and (d) above at least seven
(7) Business Days prior written notice of the date when the same will take place (and specifying the date on which the holders of outstanding shares of the Class will be entitled to exchange their shares for the securities or other
property deliverable upon the occurrence of such event); and 
 (3) with respect to the IPO, at least seven (7) Business Days prior
written notice of the date on which the Company proposes to file its registration statement in connection therewith. 
 Reference is made to
Section 1.6(c) whereby this Warrant will be deemed to be exercised pursuant to Section 1.2 hereof if the Company does not give written notice to Holder of a Cash/Public Acquisition as required by the terms hereof. Company will also provide
information requested by Holder that is reasonably necessary to enable Holder to comply with Holder’s accounting or reporting requirements. 

  
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 SECTION 4. REPRESENTATIONS, WARRANTIES OF THE HOLDER. 

The Holder represents and warrants to the Company as follows: 

4.1 Purchase for Own Account. This Warrant and the Shares issuable upon exercise of this Warrant (and the securities issuable, directly
or indirectly, upon conversion of the Shares, if any) are being acquired for investment for Holder’s account, not as a nominee or agent, and not with a view to the public resale or distribution within the meaning of the Act. Holder also
represents that it has not been formed for the specific purpose of acquiring this Warrant or the Shares (or the securities issuable, directly or indirectly, upon conversion of the Shares, if any). 

4.2 Disclosure of Information. Holder is aware of the Company’s business affairs and financial condition and has received or has
had full access to all the information it considers necessary or appropriate to make an informed investment decision with respect to the acquisition of this Warrant and its underlying securities. Holder further has had an opportunity to ask
questions and receive answers from the Company regarding the terms and conditions of the offering of this Warrant and its underlying securities and to obtain additional information (to the extent the Company possessed such information or could
acquire it without unreasonable effort or expense) necessary to verify any information furnished to Holder or to which Holder has access. 

4.3 Investment Experience. Holder understands that the purchase of this Warrant and its underlying securities involves substantial risk.
Holder has experience as an investor in securities of companies in the development stage and acknowledges that Holder can bear the economic risk of such Holder’s investment in this Warrant and its underlying securities and has such knowledge
and experience in financial or business matters that Holder is capable of evaluating the merits and risks of its investment in this Warrant and its underlying securities and/or has a preexisting personal or business relationship with the Company and
certain of its officers, directors or controlling persons of a nature and duration that enables Holder to be aware of the character, business acumen and financial circumstances of such persons. 

4.4 Accredited Investor Status. Holder is an “accredited investor” within the meaning of Regulation D promulgated under the
Act. 
 4.5 The Act. Holder understands that this Warrant and the Shares issuable upon exercise hereof (and the securities issuable,
directly or indirectly, upon conversion of the Shares, if any) have not been registered under the Act in reliance upon a specific exemption therefrom, which exemption depends upon, among other things, the bona fide nature of the Holder’s
investment intent as expressed herein. Holder understands that this Warrant and the Shares issued upon any exercise hereof (and the securities issuable, directly or indirectly, upon conversion of the Shares, if any) must be held indefinitely unless
subsequently registered under the Act and qualified under applicable state securities laws, or unless exemption from such registration and qualification are otherwise available. Holder is aware of the provisions of Rule 144 promulgated under the
Act. 
 4.6 Market Stand-off Agreement. The Holder agrees that the Shares shall be subject to
the market standoff provisions in Section 2.8 of the Company’s Investor Rights Agreement or similar agreement. 
 4.7 No Voting
Rights. Holder, as a Holder of this Warrant, will not have any voting rights until the exercise of this Warrant. 
  

SECTION 5. MISCELLANEOUS. 

5.1 Term; Automatic Cashless Exercise Upon Expiration. 

(a) Term. Subject to the provisions of Section 1.6 above, this Warrant is exercisable in whole or in part at any time and from time
to time on or before 6:00 PM, Eastern time, on the Expiration Date and shall be void thereafter. 

  
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 (b) Automatic Cashless Exercise upon Expiration. In the event that, upon the Expiration
Date, the fair market value of one Share (or other security issuable upon the exercise hereof) as determined in accordance with Section 1.3 above is greater than the Warrant Price in effect on such date, then this Warrant shall automatically be
deemed on and as of such date to be exercised pursuant to Section 1.2 above as to all Shares (or such other securities) for which it shall not previously have been exercised, and the Company shall, within a reasonable time, deliver a
certificate representing the Shares (or such other securities) issued upon such exercise to Holder. 
 5.2 Legends. Each certificate
evidencing Shares (and each certificate evidencing the securities issued, directly or indirectly, upon conversion of any Shares, if any) shall be imprinted with a legend in substantially the following form: 

THE SHARES EVIDENCED BY THIS CERTIFICATE HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”), OR
THE SECURITIES LAWS OF ANY STATE AND, EXCEPT AS SET FORTH IN THAT CERTAIN WARRANT TO PURCHASE STOCK ISSUED BY THE ISSUER TO OXFORD FINANCE LLC DATED SEPTEMBER 30, 2014, MAY NOT BE OFFERED, SOLD, PLEDGED OR OTHERWISE TRANSFERRED UNLESS AND UNTIL
REGISTERED UNDER SAID ACT AND LAWS OR, IN THE OPINION OF LEGAL COUNSEL IN FORM AND SUBSTANCE SATISFACTORY TO THE ISSUER, SUCH OFFER, SALE, PLEDGE OR OTHER TRANSFER IS EXEMPT FROM SUCH REGISTRATION. 

5.3 Compliance with Securities Laws on Transfer. This Warrant and the Shares issued upon exercise of this Warrant (and the securities
issued, directly or indirectly, upon conversion of the Shares, if any) may not be transferred or assigned in whole or in part except in compliance with applicable federal and state securities laws by the transferor and the transferee (including,
without limitation, the delivery of investment representation letters and legal opinions reasonably satisfactory to the Company, as reasonably requested by the Company). The Company shall not require Holder to provide an opinion of counsel if the
transfer is to an affiliate of Holder, provided that any such transferee is an “accredited investor” as defined in Regulation D promulgated under the Act. Additionally, the Company shall also not require an opinion of counsel if the
Company and Holder agree that there is no material question as to the availability of Rule 144 promulgated under the Act. 
 5.4 Transfer
Procedure. After receipt by Oxford of the executed Warrant, Oxford may transfer all or part of this Warrant to one or more of Oxford’s affiliates (each, an “Oxford Affiliate”), by execution of an Assignment substantially in
the form of Appendix 2 and delivery by the transferee to the Company of a duly executed signature page to the Option and Support Agreement (unless such Oxford Affiliate has previously delivered to the Company an executed signature page to the Option
and Support Agreement and acknowledges in connection with such transfer that the portion of the Warrant transferred and the securities issuable thereunder will be subject to the terms of the Option and Support Agreement). Subject to the provisions
of Section 5.3 and upon providing the Company with written notice, Oxford, any such Oxford Affiliate and any subsequent Holder, may transfer all or part of this Warrant or the Shares issued upon exercise of this Warrant (or the securities
issued, directly or indirectly, upon conversion of the Shares, if any) to any other transferee, provided, however, in connection with any such transfer, the Oxford Affiliate(s) or any subsequent Holder will give the Company notice of the portion of
the Warrant or the Shares issued upon exercise of this Warrant (or the securities issued, directly or indirectly, upon conversion of the Shares, if any) being transferred with the name, address and taxpayer identification number of the transferee
and will surrender this Warrant (and/or any stock certificates representing the Shares issued upon exercise of this Warrant (or the securities issued directly or indirectly, upon conversion of the Shares, if any) being transferred) to the Company
for reissuance to the transferee(s) (and Holder if applicable); and provided further, that such transferee shall deliver a duly executed signature page to the Option and Support Agreement to the Company and agree in writing with the Company to be
bound by all of the terms and conditions of this Warrant or to which the Shares issued upon exercise of this Warrant (or the securities issued directly or indirectly, upon conversion of the Shares, if any) being transferred are then subject, as
applicable. Notwithstanding any contrary provision herein, at all times prior to the IPO, Holder may not, without the Company’s prior written consent, transfer this Warrant or any portion hereof, or any Shares issued upon any exercise hereof,
or any shares or other securities issued directly or indirectly upon any conversion of any Shares issued upon any exercise hereof, to any person or entity who directly competes with the Company, except in connection with an Acquisition of the
Company by such a direct competitor. 

  
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 5.5 Notices. All notices and other communications hereunder from the Company to the
Holder, or vice versa, shall be deemed delivered and effective (i) when given personally, (ii) on the third (3rd) Business Day after being mailed by first-class registered or certified mail, postage prepaid, (iii) upon actual receipt
if given by facsimile or electronic mail and such receipt is confirmed in writing by the recipient, or (iv) on the first Business Day following delivery to a reliable overnight courier service, courier fee prepaid, in any case at such address
as may have been furnished to the Company or Holder, as the case may be, in writing by the Company or such Holder from time to time in accordance with the provisions of this Section 5.5. All notices to Holder shall be addressed as follows until
the Company receives notice of a change of address in connection with a transfer or otherwise: 
 Oxford Finance LLC 

133 N. Fairfax Street 

Alexandria, VA 22314 
 Attn:
Legal Department 
 Telephone: (703) 519-4900 

Facsimile: (703) 519-5225 

Email: LegalDepartment@oxfordfinance.com 

Notice to the Company shall be addressed as follows until Holder receives notice of a change in address: 

Constellation Pharmaceuticals, Inc. 

Attn: Chief Financial Officer 

215 First Street, Suite 200 

Cambridge, MA 02142 
 Telephone:
(617) 714-0555 
 Facsimile: (617) 577-0472 

Email:Matthias.Jaffe@ConstellationPharma.com 

With a copy (which shall not constitute notice) to: 

Wilmer Cutler Pickering Hale and Dorr LLP 

Attn: Steven D. Singer, Esq. 

60 State Street 
 Boston, MA
02109 
 Telephone: (617) 526-6000 

Facsimile: (617) 526-5000 

Email: steven.singer@wilmerhale.com 

5.6 Waiver. This Warrant and any term hereof may be changed, waived, discharged or terminated (either generally or in a particular
instance and either retroactively or prospectively) only by an instrument in writing signed by the party against which enforcement of such change, waiver, discharge or termination is sought. 

5.7 Attorneys’ Fees. In the event of any dispute between the parties concerning the terms and provisions of this Warrant, the party
prevailing in such dispute shall be entitled to collect from the other party all costs incurred in such dispute, including reasonable attorneys’ fees. 

5.8 Counterparts; Facsimile/Electronic Signatures. This Warrant may be executed in counterparts, all of which together shall constitute
one and the same agreement. Any signature page delivered electronically or by facsimile shall be binding to the same extent as an original signature page with regards to any agreement subject to the terms hereof or any amendment thereto. 

5.9 Governing Law. This Warrant shall be governed by and construed in accordance with the laws of the State of New York, without giving
effect to its principles regarding conflicts of law. 
 5.10 Headings. The headings in this Warrant are for purposes of reference only
and shall not limit or otherwise affect the meaning of any provision of this Warrant. 

  
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 5.11 Business Days. “Business Day” is any day that is not a Saturday,
Sunday or a day on which Silicon Valley Bank is closed. 
 [Remainder of page left blank intentionally] 

[Signature page follows] 

  
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 IN WITNESS WHEREOF, the parties have caused this Warrant to Purchase Stock to be executed by
their duly authorized representatives effective as of the Issue Date written above. 
  

			
	“COMPANY”
	
	CONSTELLATION PHARMACEUTICALS, INC.
		
	By:	 	 /s/ Matthias Jaffe

	Name: Matthias Jaffe
	Title: CFO
	
	“HOLDER”
	
	OXFORD FINANCE LLC
		
	By:	 	 /s/ Mark Davis

	Name: Mark Davis

 Title: Vice President – Finance, Secretary & Treasurer 

[Signature Page to Warrant to Purchase Stock – Oxford Term B #1] 







 APPENDIX 1 

NOTICE OF EXERCISE 
 1.
The undersigned Holder hereby exercises its right to purchase ___________ shares of the Common/Series ______ Preferred [circle one] Stock of Constellation Pharmaceuticals, Inc. (the “Company”) in accordance with the attached Warrant
To Purchase Stock, and tenders payment of the aggregate Warrant Price for such shares as follows: 
 [    ] check in the
amount of $________ payable to order of the Company enclosed herewith 
 [    ] Wire transfer of immediately available
funds to the Company’s account 
 [    ] Cashless Exercise pursuant to Section 1.2 of the Warrant 

[    ] Other [Describe] __________________________________________ 

2. Please issue a certificate or certificates representing the Shares in the name specified below: 

 

	
	  
 Holder’s Name

	
	  

	
	
	  
 (Address)


 3. By its execution below and for the benefit of the Company, Holder hereby restates each of the
representations and warranties in Section 4 of the Warrant to Purchase Stock as of the date hereof. 
  

	
	 HOLDER:

	
	  

	
	 By:
                                         
                                   

	
	 Name:
                                         
                              

	
	 Title:
                                         
                                

	
	 Date:
                                         
                                




  
 Appendix 1 








 APPENDIX 2 

ASSIGNMENT 
 For
value received, Oxford Finance LLC hereby sells, assigns and transfers unto 
  

					
		 	Name:	 	[OXFORD TRANSFEREE]
			
		 	Address:	 	  

			
		 	Tax ID:	 	  


 that certain Warrant to Purchase Stock issued by Constellation Pharmaceuticals, Inc. (the “Company”), on
September 30, 2014 (the “Warrant”) together with all rights, title and interest therein. 
  

	
	OXFORD FINANCE LLC
	
	By:
                                         
                           
	
	Name:
                                         
                      
	
	Title:
                                         
                        



 

	
	Date:
                                         
                       

 By its execution below, and for the benefit of the Company, [OXFORD TRANSFEREE] makes each of the representations and
warranties set forth in Article 4 of the Warrant and agrees to all other provisions of the Warrant as of the date hereof. 
  

	
	[OXFORD TRANSFEREE]
	
	By:
                                         
                           
	
	Name:
                                         
                      
	
	Title:
                                         
                       ]



  
 Appendix 2 








 SCHEDULE 1 

Company Capitalization Table 

See attached 

  
 Schedule 1