Document:

EX-10.15

 Exhibit 10.15 

 

					
	 Name:
	  	 	[	•] 
	 Number of Shares subject to the Stock Option:
	  	 	[	•] 
	 Exercise price per Share:
	  	$	[	•] 
	 Date of Grant:
	  	 	[	•] 

 FOGHORN THERAPEUTICS INC. 

2020 EQUITY INCENTIVE PLAN 

NON-STATUTORY STOCK OPTION AGREEMENT 

(NON-EMPLOYEE DIRECTORS) 

This agreement (this “Agreement”) evidences a stock option granted by Foghorn Therapeutics Inc. (the
“Company”) to the individual named above (the “Participant”), pursuant to and subject to the terms of the Foghorn Therapeutics Inc. 2020 Equity Incentive Plan (as from time to time amended and in effect, the
“Plan”). Except as otherwise defined herein, all capitalized terms used herein have the same meaning as in the Plan. 

1. Grant of the Stock Option. The Company grants to the Participant on the date set forth above (the “Date of Grant”)
an option (the “Stock Option”) to purchase, pursuant to and subject to the terms set forth in this Agreement and in the Plan, up to the number of shares of Stock set forth above (the “Shares”) with an exercise price
per Share as set forth above, in each case, subject to adjustment pursuant to Section 7 of the Plan in respect of transactions occurring after the date hereof. 

The Stock Option evidenced by this Agreement is a non-statutory option (that is, an option that is not
intended to qualify as an ISO) and is granted to the Participant in connection with the Participant’s Employment. 
 2. Vesting.
The term “vest” as used herein with respect to the Stock Option or any portion thereof means to become exercisable, and the term “vested” with respect to the Stock Option or any portion thereof means that the Stock Option (or
portion thereof) is then exercisable. Unless earlier terminated, forfeited, relinquished or expired, the Stock Option will vest [as to one-third of the Shares underlying the Stock Option on each of the first
three anniversaries of the Date of Grant (with the number of Shares that vest on any date being rounded down to the nearest whole Share and the option becoming vested as to 100% of the Shares on the third anniversary of the Date of Grant)]1[in full
on the first anniversary of the Date of Grant]2, subject to the Participant’s continued Employment through [each][the] applicable vesting date. 

3. Exercise of the Stock Option. No portion of the Stock Option may be exercised until such portion vests. Each election to exercise any
vested portion of the Stock Option will be subject to the terms and conditions of the Plan and must be in written or electronic form acceptable to the Administrator, signed (including by electronic signature) by the Participant or, if at the
relevant time the Stock Option has passed to the estate or beneficiary of the Participant or to a 
  

 

	1 	 For initial grants. 

	2 	 For annual grants. 

 
permitted transferee, such estate or beneficiary or permitted transferee. Each such written or electronic exercise election must be received by the Company at its principal office or by such
other party as the Administrator may prescribe and must be accompanied by payment in full of the exercise price by cash or check, through a broker-assisted exercise program acceptable to the Administrator, or as otherwise provided in the Plan. The
latest date on which the Stock Option or any portion thereof may be exercised is the tenth (10th) anniversary of the Date of Grant and, if not exercised by such date, the Stock Option or any remaining portion thereof will thereupon immediately
terminate. 
 4. Cessation of Employment. If the Participant’s Employment ceases, the Stock Option, to the extent not then
vested, will be forfeited immediately for no consideration, and any vested portion of the Stock Option that is then outstanding will remain exercisable for the period described in Section 6(a)(4) of the Plan. 

5. Restrictions on Transfer. The Stock Option may not be transferred except as expressly permitted under Section 6(a)(3) of the
Plan. 
 6. Forfeiture; Recovery of Compensation. By accepting, or being deemed to have accepted, the Stock Option, the Participant
expressly acknowledges and agrees that his or her rights, and those of any permitted transferee, with respect to the Stock Option, including the right to any Shares acquired under the Stock Option or proceeds from the disposition thereof, are
subject to Section 6(a)(5) of the Plan (including any successor provision). The Participant further agrees to be bound by the terms of any clawback or recoupment policy of the Company that applies to incentive compensation that includes Awards
such as the Stock Option. Nothing in the preceding sentence will be construed as limiting the general application of Section 8 of this Agreement. 

7. Taxes. The Participant is responsible for satisfying and paying all taxes arising from or due in connection with the Stock Option,
its exercise or a disposition of any Shares acquired upon exercise of the Stock Option. The Company will have no liability or obligation related to the foregoing. 

8. Provisions of the Plan. This Agreement is subject in its entirety to the provisions of the Plan, which are incorporated herein by
reference. A copy of the Plan as in effect on the Date of Grant has been made available to the Participant. By accepting, or being deemed to have accepted, the Stock Option, the Participant agrees to be bound by the terms of the Plan and this
Agreement. In the event of any conflict between the terms of this Agreement and the Plan, the terms of the Plan will control. 
 9.
Acknowledgements. This Agreement represents the entire agreement and understanding between the parties hereto with respect to the subject matter hereof, and supersedes all prior and contemporaneous communications, agreements and understandings,
written or oral, relating thereto. This Agreement may be executed in counterparts (and may be delivered by email or other electronic means), each of which will be deemed an original and all of which together will constitute one and the same
instrument. 
 [Remainder of Page Intentionally Left Blank] 

  
 -2- 

 IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first
written above. 
  

			
	 FOGHORN THERAPEUTICS INC.

		
	 By:
	 	
             

	 Name:  [•]

	 Title:    [•]

  

	
	 Accepted and agreed:

	  

	 [NAME]

 [Signature Page to Stock Option Agreement]EX-10.16

 Exhibit 10.16 

FOGHORN THERAPEUTICS INC. 

2020 EMPLOYEE STOCK PURCHASE PLAN 
  

	1.	 Defined Terms 

Exhibit A, which is incorporated by reference, defines the terms used in the Plan and sets forth certain operational rules related to those
terms. 
  

	2.	 Purpose of Plan 

The Plan is intended to enable Eligible Employees to use payroll deductions to purchase shares of Stock in offerings under the Plan, and
thereby acquire an interest in the Company. The Plan is intended to qualify as an “employee stock purchase plan” under Section 423 and to be exempt from the application and requirements of Section 409A of the Code, and is to be
construed accordingly. 
  

	3.	 Options to Purchase Stock 

Subject to adjustment pursuant to Section 16 of the Plan, the maximum aggregate number of shares of Stock available for purchase
pursuant to the exercise of Options granted under the Plan will be 360,000 shares (the “Initial Share Pool”). The Initial Share Pool will automatically increase on January 1 of each year from 2021 to 2030 by the lesser of
(i) one percent (1%) of the number of shares of Stock outstanding as of the close of business on the immediately preceding December 31 and (ii) the number of shares of Stock determined by the Board on or prior to such date for such
year, up to a maximum of 3,220,520 shares in the aggregate (the Initial Share Pool, as it may be so increased, the “Share Pool”). The shares of Stock to be delivered upon exercise of Options under the Plan may be either shares of
authorized but unissued Stock, treasury Stock, or previously issued Stock acquired by the Company. If any Option granted under the Plan expires or terminates for any reason without having been exercised in full or ceases for any reason to be
exercisable in whole or in part, the unpurchased shares of Stock subject to such Option will not reduce the Share Pool and will again be available for purchase under the Plan. If, on an Exercise Date, the total number of shares of Stock that would
otherwise be subject to Options granted under the Plan exceeds the number of shares then available in the Share Pool, the Administrator shall make a pro rata allocation of the shares remaining available for purchase under the Plan in as uniform a
manner as is practicable and as it determines to be equitable. In such event, the Administrator shall notify each Participant of such reduction and of the effect on the Participant’s Options and may reduce the rate of a Participant’s
payroll deductions, if necessary. 
  

	4.	 Eligibility 

(a) Eligibility Requirements. Subject to Section 13 of the Plan, and the exceptions and limitations set forth
in Section 4(b), Section 4(c), and Section 6 of the Plan, or as may be provided elsewhere in the Plan or in any sub-plan contemplated by Section 23, each
Employee (i) who has been continuously employed by the Company or a Designated Subsidiary, as applicable, for a period of at least fifteen (15) calendar days as of the first day of an Option Period; (ii) whose customary Employment
with the Company or a Designated Subsidiary, as applicable, is for more than five (5) months per calendar year; (iii) who customarily works twenty (20) hours or more per week; and (iv) who satisfies the requirements set forth in
the Plan will be an Eligible Employee. 

 (b) Five Percent Shareholders. No Employee may be granted an Option
under the Plan if, immediately after the Option is granted, the Employee would own (or pursuant to Section 424(d) of the Code would be deemed to own) stock possessing five percent (5%) or more of the total combined voting power or value of all
classes of stock of the Company or of its Parent or Subsidiaries, if any. 
 (c) Additional Requirements. The
Administrator may, for Option Periods that have not yet commenced, establish additional or other eligibility requirements, or amend the eligibility requirements set forth in Section 4(a) above, in each case, consistent with the
requirements of Section 423. 
  

	5.	 Option Periods 

The Plan will generally be implemented by a series of separate offerings referred to as “Option Periods.” Unless otherwise
determined by the Administrator, the Option Periods will be successive periods of approximately six (6) months commencing on the first Business Day in January and July of each year, anticipated to be on or around January 1 and July 1,
and ending approximately six (6) months later on the last Business Day in June or December, as applicable, of each year, anticipated to be on or around June 30 and December 31. The last Business Day of each Option Period will be an
“Exercise Date.” The Administrator may change the Exercise Date, the commencement date, the ending date and the duration of each Option Period, in each case, to the extent permitted by Section 423; provided,
however, that no Option may be exercised after twenty-seven (27) months from its grant date. 
  

	6.	 Option Grant 

Subject to the requirements and limitations set forth in Sections 4 and 10 of the Plan and the Maximum Share Limit, on the first
day of an Option Period, each Participant will automatically be granted an Option to purchase shares of Stock on the Exercise Date; provided, however, that no Participant will be granted an Option under the Plan that permits the
Participant’s right to purchase shares of Stock under the Plan and under all other employee stock purchase plans of the Company and its Parent and Subsidiaries, if any, to accrue at a rate that exceeds $25,000 in Fair Market Value (or such
other maximum as may be prescribed from time to time by the Code) for each calendar year during which any Option granted to such Participant is outstanding at any time, as determined in accordance with Section 423(b)(8) of the Code. 

 

	7.	 Method of Participation 

(a) Payroll Deduction and Participation Authorization. To participate in an Option Period, an Eligible Employee must
execute and deliver to the Administrator a payroll deduction and participation authorization form in accordance with the procedures prescribed by, and in a form acceptable to, the Administrator and, in so doing, the Eligible Employee will thereby
become a Participant as of the first day of such Option Period. Such an Eligible Employee will remain a Participant with respect to subsequent Option Periods until his or her participation in the Plan is terminated as provided herein. Such payroll
deduction and participation authorization must be delivered not later than fifteen (15) calendar days prior to the first day of an Option Period, or such other time as specified by the Administrator. 

  
 -2- 

 (b) Changes to Payroll Deduction Authorization for Subsequent Option
Periods. A Participant’s payroll deduction authorization will remain in effect for subsequent Option Periods unless the Participant files a new authorization not later than fifteen (15) calendar days prior to the first day of the
subsequent Option Period (or such other time as specified by the Administrator) or the Participant’s Option is cancelled pursuant to Section 13 or Section 14 of the Plan. 

(c) Changes to Payroll Deduction Authorization for Current Option Period. During an Option Period, a Participant’s
payroll deduction authorization may not be increased or decreased, except that a Participant may terminate his or her payroll deduction authorization by canceling his or her Option in accordance with Section 13 of the Plan. 

(d) Payroll Deduction Percentage. Each payroll deduction authorization will authorize payroll deductions as a whole
percentage from one to fifteen percent (1% to 15%) of the employee’s Eligible Compensation per payroll period. 
 (e)
Payroll Deduction Account. All payroll deductions made pursuant to this Section 7 will be credited to the Participant’s Account. Amounts credited to a Participant’s Account will not be required to be set aside
in trust or otherwise segregated from the Company’s general assets. 
  

	8.	 Method of Payment 

A Participant must pay for shares of Stock purchased under the Plan with accumulated payroll deductions credited to the Participant’s
Account.  
  

	9.	 Purchase Price 

The Purchase Price of shares of Stock issued pursuant to the exercise of an Option on each Exercise Date will be eighty-five percent (85%) (or
such greater percentage specified by the Administrator to the extent permitted under Section 423) of the lesser of (i) the Fair Market Value of a share of Stock on the date on which the Option was granted pursuant to Section 6
of the Plan (i.e., the first day of the Option Period) and (ii) the Fair Market Value of a share of Stock on the date on which the Option is deemed exercised pursuant to Section 10 of the Plan (i.e., the Exercise Date). 

 

	10.	 Exercise of Options 

(a) Purchase of Shares. Subject to the limitations set forth in Section 6 of the Plan and this
Section 10, with respect to each Option Period, on the applicable Exercise Date, each Participant will be deemed to have exercised his or her Option and the accumulated payroll deductions in the Participant’s Account will be applied
to purchase the greatest number of shares of Stock (rounded down to the nearest whole share) that can be purchased with such Account balance at the applicable Purchase Price; provided, however, that no more than 1,500 shares of Stock
may be purchased by a Participant on any Exercise Date, or such lesser number as the Administrator may prescribe in accordance with Section 423 (the “Maximum Share Limit”). As soon as practicable thereafter, shares of Stock so
purchased will be placed, in book-entry form, into a record keeping account in the name of the Participant. No fractional shares will be purchased pursuant to the exercise of an Option under the Plan; any accumulated payroll deductions in a
Participant’s Account that are not sufficient to purchase a whole share will be retained in the Participant’s Account for the subsequent Option Period, subject to earlier withdrawal by the Participant as provided in Section 13
hereof. 

  
 -3- 

 (b) Return of Account Balance. Except as provided in
Section 10(a) above with respect to fractional shares, any accumulated amount of payroll deductions in a Participant’s Account for an Option Period that are not used for the purchase of shares of Stock, whether because of the
Participant’s withdrawal from participation in an Option Period or for any other reason, will be returned to the Participant (or his or her designated beneficiary or legal representative, as applicable), without interest, as soon as
administratively practicable after such withdrawal or other event, as applicable. If the Participant’s accumulated payroll deductions on the Exercise Date of an Option Period would otherwise enable the Participant to purchase shares of Stock in
excess of the Maximum Share Limit or the maximum Fair Market Value set forth in Section 6 of the Plan, the excess of the amount of the accumulated payroll deductions over the aggregate Purchase Price of the shares of Stock actually
purchased will be returned to the Participant, without interest, as soon as administratively practicable after such Exercise Date. 
  

	11.	 Interest 

No interest will accrue or be payable on any amount held in the Account of any Participant. 

 

	12.	 Taxes 

Payroll deductions will be made on an after-tax basis. The Administrator will have the right to make
such provision as it deems necessary for, and may condition the exercise of an Option on, the satisfaction of its obligations to withhold federal, state, local income or other taxes incurred by reason of the purchase or disposition of shares of
Stock under the Plan. In the Administrator’s discretion and subject to applicable law, such tax obligations may be satisfied in whole or in part by delivery of shares of Stock to the Company, including shares of Stock purchased under the Plan,
valued at Fair Market Value, but not in excess of the maximum withholding amount consistent with the award being subject to equity accounting treatment under the Accounting Rules. 

 

	13.	 Cancellation and Withdrawal 

A Participant who has been granted an Option under the Plan may cancel all (but not less than all) of such Option and terminate his or her
participation in the Plan by notice to the Administrator in accordance with the procedures prescribed by, and in a form acceptable to, the Administrator. To be effective with respect to an upcoming Exercise Date, such cancellation notice must be
delivered not later than twenty (20) calendar days prior to such Exercise Date (or such other time as specified by the Administrator). Upon such termination and cancellation, the balance in the Participant’s Account will be returned to the
Participant, without interest, as soon as administratively practicable thereafter. For the avoidance of doubt, a Participant who reduces his or her withholding rate for a future Option Period to zero (0%) pursuant to Section 7 of the
Plan will be deemed to have terminated his or her payroll deduction authorization and canceled his or her participation in the Plan as to such Option Period and all future Option Periods, unless the Participant delivers a new payroll deduction
authorization for a subsequent Option Period in accordance with the rules of Section 7(b) of the Plan. 

  
 -4- 

	14.	 Termination of Employment; Death of Participant 

Upon the termination of a Participant’s employment with the Company or a Designated Subsidiary, as applicable, for any reason (including
the death of a Participant during an Option Period prior to an Exercise Date) or in the event the Participant ceases to qualify as an Eligible Employee, the Participant will cease to be a Participant, any Option held by the Participant under the
Plan will be canceled, the balance in the Participant’s Account will be returned to the Participant (or his or her estate or designated beneficiary in the event of the Participant’s death), without interest, as soon as administratively
practicable thereafter, and the Participant will have no further rights under the Plan. 
  

	15.	 Equal Rights; Participant’s Rights Not Transferable 

All Participants granted Options in an offering under the Plan will have the same rights and privileges, consistent with the requirements set
forth in Section 423. Any Option granted under the Plan will be exercisable during the Participant’s lifetime only by him or her and may not be sold, pledged, assigned, or transferred in any manner. In the event any Participant violates or
attempts to violate the terms of this Section 15, as determined by the Administrator in its sole discretion, any Options granted to the Participant under the Plan may be terminated by the Company and, upon the return to the Participant
of the balance of his or her Account, without interest, all of the Participant’s rights under the Plan will terminate. 
  

	16.	 Change in Capitalization; Corporate Transaction 

(a) Change in Capitalization. In the event of a stock dividend, stock split or combination of shares (including a reverse
stock split), recapitalization or other change in the Company’s capital structure that constitutes an equity restructuring within the meaning of the Accounting Rules, the Administrator shall make appropriate adjustments to the aggregate number
and type of shares of stock available under the Plan, the number and type of shares of stock granted under any outstanding Options, the maximum number and type of shares of stock purchasable under any outstanding Option, and/or the Purchase Price
under any outstanding Option, in any case, in a manner that complies with Section 423. 
 (b) Corporate
Transaction. In the event of a sale of all or substantially all of the Stock or a sale of all or substantially all of the assets of the Company, or a merger or similar transaction in which the Company is not the surviving corporation or that
results in the acquisition of the Company by another person, the Administrator may, in its discretion, (i) if the Company is merged with or acquired by another corporation, provide that each outstanding Option will be assumed or exchanged for a
substitute Option granted by the acquiror or successor corporation or by a parent or subsidiary of the acquiror or successor corporation; (ii) cancel each outstanding Option and return the balances in Participants’ Accounts to the
Participants; and/or (iii) pursuant to Section 18 of the Plan, terminate the Option Period on or before the date of the proposed sale, merger or similar transaction. 

  
 -5- 

	17.	 Administration 

The Plan will be administered by the Administrator. The Administrator has discretionary authority, subject only to the express provisions of
the Plan, to administer and interpret the Plan; to determine eligibility under the Plan; to prescribe forms, rules and procedures relating to the Plan; and to otherwise do all things necessary or desirable to carry out the purposes of the Plan.
Determinations of the Administrator made with respect to the Plan are conclusive and bind all persons. 
 The Administrator may specify the
manner in which the Company and/or Employees are to provide notices and forms under the Plan, and may require that such notices and forms be submitted electronically. 
  

	18.	 Amendment and Termination of Plan 

(a) Amendment. The Administrator reserves the right at any time or times to amend the Plan to any extent and in any manner
it may deem advisable; provided, however, that any amendment that would be treated as the adoption of a new plan for purposes of Section 423 will have no force or effect unless approved by the shareholders of the Company within
twelve (12) months before or after its adoption. 
 (b) Termination. The Administrator reserves the right at any
time or times to suspend or terminate the Plan. In connection therewith, the Administrator may provide, in its sole discretion, either that outstanding Options will be exercisable on the Exercise Date for the applicable Option Period or on such
earlier date as the Administrator may specify (in which case such earlier date will be treated as the Exercise Date for the applicable Option Period), or that the balance of each Participant’s Account will be returned to the Participant,
without interest. 
  

	19.	 Approvals 

Shareholder approval of the Plan will be obtained prior to the date that is twelve (12) months after the date of Board approval. In the
event that the Plan has not been approved by the shareholders of the Company prior to October 22, 2021, all Options to purchase shares of Stock under the Plan will be cancelled and become null and void. 

Notwithstanding anything herein to the contrary, the obligation of the Company to issue and deliver shares of Stock under the Plan will be
subject to the approval required of any governmental authority in connection with the authorization, issuance, sale or transfer of such shares of Stock and to any requirements of any national securities exchange applicable thereto, and to compliance
by the Company with other applicable legal requirements in effect from time to time. 
 20. Participants’ Rights as Shareholders and Employees

 A Participant will have no rights or privileges as a shareholder of the Company and will not receive any dividends in respect of any
shares of Stock covered by an Option granted hereunder until such Option has been exercised, full payment has been made for such shares, and the shares have been issued to the Participant. 

  
 -6- 

 Nothing contained in the provisions of the Plan will be construed as giving to any Employee
the right to be retained in the employ of the Company or any Designated Subsidiary or as interfering with the right of the Company or any Designated Subsidiary to discharge, promote, demote or otherwise
re-assign any Employee from one position to another within the Company or any Designated Subsidiary at any time. 
  

	21.	 Restrictions on Transfer; Information Regarding Disqualifying Dispositions. 

(a) Restrictions on Transfer. Except as otherwise determined by the Administrator, no Participant may transfer, sell,
pledge or alienate shares of Stock purchased under the Plan prior to the date that is six (6) months following the date of such purchase, other than by will or by the laws of descent and distribution or in connection with a corporate
transaction as described in Section 16(b) above. 
 (b) Disqualifying Dispositions. By electing to
participate in the Plan, each Participant agrees to provide such information about any transfer of Stock acquired under the Plan that occurs within two (2) years after the first day of the Option Period in which such Stock was acquired and
within one (1) year after the day such Stock was purchased as may be requested by the Company or any Designated Subsidiary in order to assist it in complying with applicable tax laws. 

 

	22.	 Miscellaneous 

(a) Waiver of Jury Trial. By electing to participate in the Plan, each Participant waives (or will be deemed to have
waived), to the maximum extent permitted under applicable law, any right to a trial by jury in any action, proceeding or counterclaim concerning any rights under the Plan or with respect to any Option, or under any amendment, waiver, consent,
instrument, document or other agreement delivered or which in the future may be delivered in connection therewith, and agrees (or will be deemed to have agreed) that any such action, proceedings or counterclaim will be tried before a court and not
before a jury. By electing to participate in the Plan, each Participant certifies that no officer, representative, or attorney of the Company has represented, expressly or otherwise, that the Company would not, in the event of any action, proceeding
or counterclaim, seek to enforce the foregoing waivers. Notwithstanding anything to the contrary in the Plan, nothing herein is to be construed as limiting the ability of the Company and a Participant to agree to submit any dispute arising under the
terms of the Plan or in respect of any Option to binding arbitration or as limiting the ability of the Company to require any individual to agree to submit such disputes to binding arbitration as a condition of receiving an Option hereunder. 

(b) Limitation of Liability. Notwithstanding anything to the contrary in the Plan, neither the Company, nor any of its
subsidiaries, nor the Administrator, nor any person acting on behalf of the Company, any of its subsidiaries, or the Administrator, will be liable to any Participant, to any permitted transferee, to the estate or beneficiary of any Participant or
any permitted transferee, or to any other person by reason of any acceleration of income, any additional tax, or any penalty, interest or other liability asserted by reason of the failure of the Plan or any Option to satisfy the requirements of
Section 423, or otherwise asserted with respect to the Plan or any Option. 

  
 -7- 

 (c) Unfunded Plan. The Company’s obligations under the Plan are
unfunded, and no Participant will have any right to specific assets of the Company in respect of any Option. Participants will be general unsecured creditors of the Company with respect to any amounts due or payable under the Plan. 

 

	23.	 Establishment of Sub-Plans 

Notwithstanding the foregoing or any provision of the Plan to the contrary, consistent with the requirements of Section 423, the
Administrator may, in its sole discretion, amend the terms of the Plan, or an offering and/or provide for separate offerings under the Plan in order to, among other things, reflect the impact of local law outside of the United States as applied to
one or more Eligible Employees of a Designated Subsidiary and may, where appropriate, establish one or more sub-plans to reflect such amended provisions. 

 

	24.	 Governing Law 

(a) Certain Requirements of Corporate Law. Options and shares of Stock will be granted, issued and administered consistent
with the requirements of applicable Delaware law relating to the issuance of stock and the consideration to be received therefor, and with the applicable requirements of the stock exchanges or other trading systems on which the Stock is listed or
entered for trading, in each case as determined by the Administrator. 
 (b) Other Matters. Except as otherwise provided
by the express terms of a sub-plan described in Section 23 or as provided in Section 24(a), the domestic substantive laws of the State of Delaware govern the provisions of the Plan and
of Options under the Plan and all claims or disputes arising out of or based upon the Plan or any Option or relating to the subject matter hereof or thereof without giving effect to any choice or conflict of laws provision or rule that would cause
the application of the domestic substantive laws of any other jurisdiction. 
 (c) Jurisdiction. By electing to
participant in the Plan, each Participant agrees or will be deemed to have agreed to (i) submit irrevocably and unconditionally to the jurisdiction of the federal and state courts located within the geographic boundaries of the United States
District Court for the District of Delaware for the purpose of any suit, action or other proceeding arising out of or based upon the Plan or any Option; (ii) not commence any suit, action or other proceeding arising out of or based upon the
Plan or any Option, except in the federal and state courts located within the geographic boundaries of the United States District Court for the District of Delaware; and (iii) waive, and not assert, by way of motion as a defense or otherwise,
in any such suit, action or proceeding, any claim that he or she is not subject personally to the jurisdiction of the above-named courts that his or her property is exempt or immune from attachment or execution, that the suit, action or proceeding
is brought in an inconvenient forum, that the venue of the suit, action or proceeding is improper or that the Plan or any Option or the subject matter thereof may not be enforced in or by such court. 

  
 -8- 

 25. Effective Date and Term 

The Plan will become effective upon adoption of the Plan by the Board and no rights will be granted hereunder after the earliest to occur of
(i) the Plan’s termination by the Company; (ii) the issuance of all shares of Stock available for issuance under the Plan; and (iii) the day before the ten- (10) year anniversary of the
date the Board approves the Plan. 
 * * * * 

  
 -9- 

 Exhibit A 

DEFINED TERMS 
 The
following terms, when used in the Plan, have the meanings and are subject to the provisions set forth below: 
 “401(k)
Plan”: A savings plan qualifying under Section 401(k) of the Code that is sponsored by the Company or one of its Subsidiaries for the benefit of its employees. 

“Account”: A notional payroll deduction account maintained in the Participant’s name on the books of the Company. 

“Accounting Rules”: Financial Accounting Standards Board Accounting Standards Codification Topic 718, or any successor
provision. 
 “Administrator”: The Compensation Committee of the Board, except that the Compensation Committee may delegate
its authority under the Plan to a sub-committee comprised of one or more of its members, to members of the Board, or to officers or employees of the Company to the extent permitted by applicable law. In each
case, references herein to the Administrator refer, as applicable, to such persons or groups so delegated to the extent of such delegation. 

“Board”: The board of directors of the Company. 

“Business Day”: Any day on which the established national exchange or trading system (including the Nasdaq Global Stock
Market) on which the Stock is traded is available and open for trading. 
 “Code”: The U.S. Internal Revenue Code of 1986,
as from time to time amended and in effect, or any successor statute as from time to time in effect, including any applicable regulations and guidance thereunder. 

“Company”: Foghorn Therapeutics Inc., a Delaware corporation. 

“Designated Subsidiary”: A Subsidiary of the Company that has been designated by the Board or the Compensation Committee of
the Board from time to time as eligible to participate in the Plan. For the avoidance of doubt, any Subsidiary of the Company, whether or not a Subsidiary on the Effective Date, shall be eligible to be designated as a Designated Subsidiary
hereunder. 
 “Effective Date”: The date set forth in Section 25 of the Plan. 

“Eligible Compensation”: Regular base salary, regular base wages, overtime payments, annual bonuses, commissions and sales
incentives (excluding, for the avoidance of doubt, any long-term or equity-based incentive payments or awards and any severance or garden leave payments). Eligible Compensation will not be reduced by any income or employment tax withholdings or any
contributions by the Employee to a 401(k) Plan or a plan under Section 125 of the Code, but will be reduced by any contributions made on the Employee’s behalf by the Company or any Subsidiary to any deferred compensation plan or welfare
benefit program now or hereafter established. 

 “Eligible Employee”: Any Employee who meets the eligibility requirements
set forth in Section 4 of the Plan. 
 “Employee”: Any person who is employed by the Company or a Designated
Subsidiary. For the avoidance of doubt, independent contractors and consultants are not “Employees”. 
 “Exercise
Date”: The date set forth in Section 5 of the Plan or otherwise designated by the Administrator with respect to a particular Option Period on which a Participant will be deemed to have exercised the Option granted to him or her
for such Option Period. 
 “Fair Market Value”: 

(i) If the Stock is readily traded on an established national exchange or trading system (including the Nasdaq Global Stock
Market), the closing price of a share of Stock as reported by the principal exchange on which such Stock is traded; provided, however, that if such day is not a trading day, Fair Market Value will mean the reported closing price of a
share of Stock for the immediately preceding day that is a trading day. 
 (ii) If the Stock is not traded on an established
national exchange or trading system, the average of the bid and ask prices for shares Stock where the bid and ask prices are quoted. 

(iii) If the Stock cannot be valued pursuant to clauses (i) or (ii), the value as determined in good faith by the Board in
its sole discretion. 
 “Maximum Share Limit”: The meaning set forth in Section 10 of the Plan. 

“Option”: An option granted pursuant to the Plan entitling the holder to acquire shares of Stock upon payment of the Purchase
Price per share of Stock. 
 “Option Period”: An offering period established in accordance with Section 5 of the
Plan. 
 “Parent”: A “parent corporation” as defined in Section 424(e) of the Code. 

“Participant”: An Eligible Employee who elects to participate in an Option Period under the Plan. 

“Plan”: The Foghorn Therapeutics Inc. 2020 Employee Stock Purchase Plan, as from time to time amended and in effect. 

“Purchase Price”: The price per share of Stock with respect to an Option Period determined in accordance with
Section 9 of the Plan. 
 “Section 423”: Section 423 of the Code and the regulations thereunder. 

“Stock”: Common stock of the Company, par value $0.001 per share. 

“Subsidiary”: A “subsidiary corporation” as defined in Section 424(f) of the Code. 

  
 A-2

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00315-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00315-of-00352.parquet"}]]