Document:

EX-10.2

 Exhibit 10.2 

RAPT Therapeutics Inc. (f/k/a FLX Bio, Inc.) 

2015 STOCK PLAN 

ADOPTED ON APRIL 7, 2015 

 TABLE OF CONTENTS 

 

							
	 	 	 	  	Page	 
	 SECTION 1.
	 	 ESTABLISHMENT AND PURPOSE
	  	 	1	 
			
	 SECTION 2.
	 	 ADMINISTRATION
	  	 	1	 
	 (a)
	 	 Committees of the Board of Directors
	  	 	1	 
	 (b)
	 	 Authority of the Board of Directors
	  	 	1	 
			
	 SECTION 3.
	 	 ELIGIBILITY
	  	 	1	 
	 (a)
	 	 General Rule
	  	 	1	 
	 (b)
	 	 Ten-Percent Stockholders
	  	 	1	 
			
	 SECTION 4.
	 	 STOCK SUBJECT TO PLAN
	  	 	2	 
	 (a)
	 	 Basic Limitation
	  	 	2	 
	 (b)
	 	 Additional Shares
	  	 	2	 
			
	 SECTION 5.
	 	 TERMS AND CONDITIONS OF AWARDS OR SALES
	  	 	2	 
	 (a)
	 	 Stock Grant or Purchase Agreement
	  	 	2	 
	 (b)
	 	 Duration of Offers and Nontransferability of Rights
	  	 	2	 
	 (c)
	 	 Purchase Price
	  	 	3	 
			
	 SECTION 6.
	 	 TERMS AND CONDITIONS OF OPTIONS
	  	 	3	 
	 (a)
	 	 Stock Option Agreement
	  	 	3	 
	 (b)
	 	 Number of Shares
	  	 	3	 
	 (c)
	 	 Exercise Price
	  	 	3	 
	 (d)
	 	 Exercisability
	  	 	3	 
	 (e)
	 	 Basic Term
	  	 	3	 
	 (f)
	 	 Termination of Service (Except by Death)
	  	 	3	 
	 (g)
	 	 Leaves of Absence
	  	 	4	 
	 (h)
	 	 Death of Optionee
	  	 	4	 
	 (i)
	 	 Restrictions on Transfer of Options
	  	 	5	 
	 (j)
	 	 No Rights as a Stockholder
	  	 	5	 
	 (k)
	 	 Modification, Extension and Assumption of Options
	  	 	5	 
	 (l)
	 	 Company’s Right to Cancel Certain Options
	  	 	5	 
			
	 SECTION 7.
	 	 PAYMENT FOR SHARES
	  	 	5	 
	 (a)
	 	 General Rule
	  	 	5	 
	 (b)
	 	 Services Rendered
	  	 	5	 
	 (c)
	 	 Promissory Note
	  	 	5	 
	 (d)
	 	 Surrender of Stock
	  	 	6	 
	 (e)
	 	 Exercise/Sale
	  	 	6	 
	 (f)
	 	 Net Exercise
	  	 	6	 
	 (g)
	 	 Other Forms of Payment
	  	 	6	 
			
	 SECTION 8.
	 	 ADJUSTMENT OF SHARES
	  	 	6	 
	 (a)
	 	 General
	  	 	6	 
	 (b)
	 	 Corporate Transactions
	  	 	7	 
	 (c)
	 	 Reservation of Rights
	  	 	8	 

							
			
	 SECTION 9.
	 	 MISCELLANEOUS PROVISIONS
	  	 	8	 
	 (a)
	 	 Securities Law Requirements
	  	 	8	 
	 (b)
	 	 No Retention Rights
	  	 	8	 
	 (c)
	 	 Treatment as Compensation
	  	 	9	 
	 (d)
	 	 Governing Law
	  	 	9	 
	 (e)
	 	 Conditions and Restrictions on Shares
	  	 	9	 
	 (f)
	 	 Tax Matters
	  	 	9	 
			
	 SECTION 10.
	 	 DURATION AND AMENDMENTS; STOCKHOLDER APPROVAL
	  	 	10	 
	 (a)
	 	 Term of the Plan
	  	 	10	 
	 (b)
	 	 Right to Amend or Terminate the Plan
	  	 	10	 
	 (c)
	 	 Effect of Amendment or Termination
	  	 	10	 
	 (d)
	 	 Stockholder Approval
	  	 	10	 
			
	 SECTION 11.
	 	 DEFINITIONS
	  	 	10	 

  
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 RAPT THERAPEUTICS, INC.
(F/K/A FLX BIO, INC.) 2015 STOCK PLAN 

SECTION 1.    ESTABLISHMENT AND PURPOSE. 

The purpose of this Plan is to offer persons selected by the Company an opportunity to acquire a proprietary interest in the success of the
Company, or to increase such interest, by acquiring Shares of the Company’s Stock. The Plan provides both for the direct award or sale of Shares and for the grant of Options to purchase Shares. Options granted under the Plan may be ISOs
intended to qualify under Code Section 422 or NSOs which are not intended to so qualify. 
 Capitalized terms are defined in
Section 11. 
 SECTION 2.    ADMINISTRATION. 

(a)    Committees of the Board of Directors. The Plan may be administered by one or more Committees. Each Committee
shall consist, as required by applicable law, of one or more members of the Board of Directors who have been appointed by the Board of Directors. Each Committee shall have such authority and be responsible for such functions as the Board of
Directors has assigned to it. If no Committee has been appointed, the entire Board of Directors shall administer the Plan. Any reference to the Board of Directors in the Plan shall be construed as a reference to the Committee (if any) to whom the
Board of Directors has assigned a particular function. 
 (b)    Authority of the Board of Directors. Subject to the
provisions of the Plan, the Board of Directors shall have full authority and discretion to take any actions it deems necessary or advisable for the administration of the Plan. Notwithstanding anything to the contrary in the Plan, with respect to the
terms and conditions of awards granted to Participants outside the United States, the Board of Directors may vary from the provisions of the Plan to the extent it determines it necessary and appropriate to do so; provided that it may not vary from
those Plan terms requiring stockholder approval pursuant to Section 10(d) below. All decisions, interpretations and other actions of the Board of Directors shall be final and binding on all Purchasers, all Optionees and all persons deriving
their rights from a Purchaser or Optionee. 
 SECTION 3.    ELIGIBILITY. 

(a)    General Rule. Only Employees, Outside Directors and Consultants shall be eligible for the grant of NSOs or
the direct award or sale of Shares.1 Only Employees shall be eligible for the grant of ISOs. 

(b)    Ten-Percent Stockholders. A person who owns more than 10% of the
total combined voting power of all classes of outstanding stock of the Company, its Parent or any 
  

	1 	 Note that special considerations apply if the Company proposes to grant awards to an Employee or Consultant of
a Parent company. 

 
of its Subsidiaries shall not be eligible for the grant of an ISO unless (i) the Exercise Price is at least 110% of the Fair Market Value of a Share on the Date of Grant and (ii) such
ISO by its terms is not exercisable after the expiration of five years from the Date of Grant. For purposes of this Subsection (b), in determining stock ownership, the attribution rules of Code Section 424(d) shall be applied. 

SECTION 4.    STOCK SUBJECT TO PLAN. 

(a)    Basic Limitation. Not more than 2,200,000 Shares may be issued under the Plan, subject to Subsection (b) below
and Section 8(a).2 All of these Shares may be issued upon the exercise of ISOs. The number of Shares that are subject to Options or other rights outstanding at any time under the Plan may not
exceed the number of Shares that then remain available for issuance under the Plan. The Company, during the term of the Plan, shall at all times reserve and keep available sufficient Shares to satisfy the requirements of the Plan. Shares offered
under the Plan may be authorized but unissued Shares or treasury Shares. 
 (b)    Additional Shares. In the event that
Shares previously issued under the Plan are reacquired by the Company, such Shares shall be added to the number of Shares then available for issuance under the Plan. In the event that Shares that otherwise would have been issuable under the Plan are
withheld by the Company in payment of the Purchase Price, Exercise Price or withholding taxes, such Shares shall remain available for issuance under the Plan. In the event that an outstanding Option or other right for any reason expires or is
canceled, the Shares allocable to the unexercised portion of such Option or other right shall be added to the number of Shares then available for issuance under the Plan. 

SECTION 5.    TERMS AND CONDITIONS OF AWARDS OR SALES. 

(a)    Stock Grant or Purchase Agreement. Each award of Shares under the Plan shall be evidenced by a Stock Grant Agreement
between the Grantee and the Company. Each sale of Shares under the Plan (other than upon exercise of an Option) shall be evidenced by a Stock Purchase Agreement between the Purchaser and the Company. Such award or sale shall be subject to all
applicable terms and conditions of the Plan and may be subject to any other terms and conditions which are not inconsistent with the Plan and which the Board of Directors deems appropriate for inclusion in a Stock Grant Agreement or Stock Purchase
Agreement. The provisions of the various Stock Grant Agreements and Stock Purchase Agreements entered into under the Plan need not be identical. 

(b)    Duration of Offers and Nontransferability of Rights. Any right to purchase Shares under the Plan (other than an
Option) shall automatically expire if not exercised by the Purchaser within 30 days (or such other period as may be specified in the Award Agreement) after the grant of such right was communicated to the Purchaser by the Company. Such right is not
transferable and may be exercised only by the Purchaser to whom such right was granted. 
  

 

	2 	 Please refer to Exhibit A for a schedule of the initial share reserve and any subsequent increases in the
reserve. 

  
 2 

 (c)    Purchase Price. The Board of Directors shall determine the
Purchase Price of Shares to be offered under the Plan at its sole discretion. The Purchase Price shall be payable in a form described in Section 7. 

SECTION 6.    TERMS AND CONDITIONS OF OPTIONS. 

(a)    Stock Option Agreement. Each grant of an Option under the Plan shall be evidenced by a Stock Option Agreement
between the Optionee and the Company. The Option shall be subject to all applicable terms and conditions of the Plan and may be subject to any other terms and conditions that are not inconsistent with the Plan and that the Board of Directors deems
appropriate for inclusion in a Stock Option Agreement. The provisions of the various Stock Option Agreements entered into under the Plan need not be identical. 

(b)    Number of Shares. Each Stock Option Agreement shall specify the number of Shares that are subject to the Option and
shall provide for the adjustment of such number in accordance with Section 8. The Stock Option Agreement shall also specify whether the Option is an ISO or an NSO. 

(c)    Exercise Price. Each Stock Option Agreement shall specify the Exercise Price. The Exercise Price of an Option shall
not be less than 100% of the Fair Market Value of a Share on the Date of Grant, and in the case of an ISO a higher percentage may be required by Section 3(b). Subject to the preceding sentence, the Exercise Price shall be determined by the
Board of Directors at its sole discretion. The Exercise Price shall be payable in a form described in Section 7. This Subsection (c) shall not apply to an Option granted pursuant to an assumption of, or substitution for, another option in
a manner that complies with Code Section 424(a) (whether or not the Option is an ISO). 
 (d)    Exercisability.
Each Stock Option Agreement shall specify the date when all or any installment of the Option is to become exercisable. No Option shall be exercisable unless the Optionee (i) has delivered an executed copy of the Stock Option Agreement to the
Company or (ii) otherwise agrees to be bound by the terms of the Stock Option Agreement. The Board of Directors shall determine the exercisability provisions of the Stock Option Agreement at its sole discretion. 

(e)    Basic Term. The Stock Option Agreement shall specify the term of the Option. The term shall not exceed 10 years
from the Date of Grant, and in the case of an ISO, a shorter term may be required by Section 3(b). Subject to the preceding sentence, the Board of Directors at its sole discretion shall determine when an Option is to expire. 

(f)    Termination of Service (Except by Death). If an Optionee’s Service terminates for any reason other than the
Optionee’s death, then the Optionee’s Options shall expire on the earliest of the following dates: 

(i)    The expiration date determined pursuant to Subsection (e) above; 

  
 3 

 (ii)    The date three months after the termination of
the Optionee’s Service for any reason other than Disability, or such earlier or later date as the Board of Directors may determine (but in no event earlier than 30 days after the termination of the Optionee’s Service); or 

(iii)    The date six months after the termination of the Optionee’s Service by reason of Disability,
or such later date as the Board of Directors may determine. 
 The Optionee may exercise all or part of the Optionee’s Options at any time before the
expiration of such Options under the preceding sentence, but only to the extent that such Options had become exercisable before the Optionee’s Service terminated (or became exercisable as a result of the termination) and the underlying Shares
had vested before the Optionee’s Service terminated (or vested as a result of the termination). The balance of such Options shall lapse when the Optionee’s Service terminates. In the event that the Optionee dies after the termination of
the Optionee’s Service but before the expiration of the Optionee’s Options, all or part of such Options may be exercised (prior to expiration) by the executors or administrators of the Optionee’s estate or by any person who has
acquired such Options directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that such Options had become exercisable before the Optionee’s Service terminated (or became exercisable as a result of
the termination) and the underlying Shares had vested before the Optionee’s Service terminated (or vested as a result of the termination). 

(g)    Leaves of Absence. For purposes of Subsection (f) above, Service shall be deemed to continue while the
Optionee is on a bona fide leave of absence, if such leave was approved by the Company in writing and if continued crediting of Service for this purpose is expressly required by the terms of such leave or by applicable law (as determined by the
Company). 
 (h)    Death of Optionee. If an Optionee dies while the Optionee is in Service, then the Optionee’s
Options shall expire on the earlier of the following dates: 
 (i)    The expiration date determined
pursuant to Subsection (e) above; or 
 (ii)    The date 12 months after the Optionee’s death,
or such earlier or later date as the Board of Directors may determine (but in no event earlier than six months after the Optionee’s death). 
 All or
part of the Optionee’s Options may be exercised at any time before the expiration of such Options under the preceding sentence by the executors or administrators of the Optionee’s estate or by any person who has acquired such Options
directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that such Options had become exercisable before the Optionee’s death (or became exercisable as a result of the death) and the underlying
Shares had vested before the Optionee’s death (or vested as a result of the Optionee’s death). The balance of such Options shall lapse when the Optionee dies. 

  
 4 

 (i)    Restrictions on Transfer of Options. An Option shall be
transferable by the Optionee only by (i) a beneficiary designation, (ii) a will or (iii) the laws of descent and distribution, except as provided in the next sentence. If the applicable Stock Option Agreement so provides, an NSO shall
also be transferable by gift or domestic relations order to a Family Member of the Optionee. An ISO may be exercised during the lifetime of the Optionee only by the Optionee or by the Optionee’s guardian or legal representative. 

(j)    No Rights as a Stockholder. An Optionee, or a transferee of an Optionee, shall have no rights as a stockholder with
respect to any Shares covered by the Optionee’s Option until such person files a notice of exercise, pays the Exercise Price and satisfies all applicable withholding taxes pursuant to the terms of such Option. 

(k)    Modification, Extension and Assumption of Options. Within the limitations of the Plan, the Board of Directors may
modify, extend or assume outstanding Options or may accept the cancellation of outstanding Options (whether granted by the Company or another issuer) in return for the grant of new Options or a different type of award for the same or a different
number of Shares and at the same or a different Exercise Price (if applicable). The foregoing notwithstanding, no modification of an Option shall, without the consent of the Optionee, impair the Optionee’s rights or increase the Optionee’s
obligations under such Option. 
 (l)    Company’s Right to Cancel Certain Options. Any other
provision of the Plan or a Stock Option Agreement notwithstanding, the Company shall have the right at any time to cancel an Option that was not granted in compliance with Rule 701 under the Securities Act. Prior to canceling such Option, the
Company shall give the Optionee not less than 30 days’ notice in writing. If the Company elects to cancel such Option, it shall deliver to the Optionee consideration with an aggregate Fair Market Value equal to the excess of (i) the Fair
Market Value of the Shares subject to such Option as of the time of the cancellation over (ii) the Exercise Price of such Option. The consideration may be delivered in the form of cash or cash equivalents, in the form of Shares, or a
combination of both. If the consideration would be a negative amount, such Option may be cancelled without the delivery of any consideration. 
 SECTION
7.    PAYMENT FOR SHARES. 
 (a)    General Rule. The entire Purchase Price or Exercise
Price of Shares issued under the Plan shall be payable in cash or cash equivalents at the time when such Shares are purchased, except as otherwise provided in this Section 7. In addition, the Board of Directors in its sole discretion may also
permit payment through any of the methods described in (b) through (g) below. 
 (b)    Services Rendered. Shares
may be awarded under the Plan in consideration of services rendered to the Company, a Parent or a Subsidiary prior to the award. 

(c)    Promissory Note. All or a portion of the Purchase Price or Exercise Price (as the case may be) of Shares issued
under the Plan may be paid with a full-recourse promissory note. The Shares shall be pledged as security for payment of the principal amount of the promissory note and interest thereon. The interest rate payable under the terms of the promissory
note shall not be less than the minimum rate (if any) required to avoid the imputation of 

  
 5 

 
additional interest under the Code. Subject to the foregoing, the Board of Directors (at its sole discretion) shall specify the term, interest rate, amortization requirements (if any) and other
provisions of such note. 
 (d)    Surrender of Stock. All or any part of the Exercise Price may be paid by
surrendering, or attesting to the ownership of, Shares that are already owned by the Optionee. Such Shares shall be surrendered to the Company in good form for transfer and shall be valued at their Fair Market Value as of the date when the Option is
exercised. 
 (e)    Exercise/Sale. If the Stock is publicly traded, all or part of the Exercise Price and any
withholding taxes may be paid by the delivery (on a form prescribed by the Company) of an irrevocable direction to a securities broker approved by the Company to sell Shares and to deliver all or part of the sales proceeds to the Company. 

(f)    Net Exercise. An Option may permit exercise through a “net exercise” arrangement pursuant to which the
Company will reduce the number of Shares issued upon exercise by the largest whole number of Shares having an aggregate Fair Market Value (determined by the Board of Directors as of the exercise date) that does not exceed the aggregate Exercise
Price or the sum of the aggregate Exercise Price plus all or a portion of the minimum amount required to be withheld under applicable tax law (with the Company accepting from the Optionee payment of cash or cash equivalents to satisfy any remaining
balance of the aggregate Exercise Price and, if applicable, any additional withholding obligation not satisfied through such reduction in Shares); provided that to the extent Shares subject to an Option are withheld in this manner, the number of
Shares subject to the Option following the net exercise will be reduced by the sum of the number of Shares withheld and the number of Shares delivered to the Optionee as a result of the exercise. 

(g)    Other Forms of Payment. To the extent that an Award Agreement so provides, the Purchase Price or Exercise Price of
Shares issued under the Plan may be paid in any other form permitted by the Delaware General Corporation Law, as amended. 
 SECTION
8.    ADJUSTMENT OF SHARES. 
 (a)    General. In the event of a subdivision of the
outstanding Stock, a declaration of a dividend payable in Shares, a combination or consolidation of the outstanding Stock into a lesser number of Shares, a reclassification, or any other increase or decrease in the number of issued shares of Stock
effected without receipt of consideration by the Company, proportionate adjustments shall automatically be made in each of (i) the number and kind of Shares available for future grants under Section 4, (ii) the number and kind of Shares
covered by each outstanding Option and any outstanding and unexercised right to purchase Shares that has not yet expired pursuant to Section 5(b), (iii) the Exercise Price under each outstanding Option and the Purchase Price applicable to any
unexercised stock purchase right described in clause (ii) above, and (iv) any repurchase price that applies to Shares granted under the Plan pursuant to the terms of a Company repurchase right under the applicable Award Agreement. In the
event of a declaration of an extraordinary dividend payable in a form other than Shares in an amount that has a material effect on the Fair Market Value of the Stock, a recapitalization, a spin-off, or a
similar occurrence, the Board of Directors at its sole discretion may make appropriate 

  
 6 

 
adjustments in one or more of the items listed in clauses (i) through (iv) above; provided, however, that the Board of Directors shall in any event make such adjustments as may be required
by Section 25102(o) of the California Corporations Code. No fractional Shares shall be issued under the Plan as a result of an adjustment under this Section 8(a), although the Board of Directors in its sole discretion may make a cash
payment in lieu of fractional Shares. 
 (b)    Corporate Transactions. In the event that the Company is a party to a
merger or consolidation, or in the event of a sale of all or substantially all of the Company’s stock or assets, all Shares acquired under the Plan and all Options and other Plan awards outstanding on the effective date of the transaction shall
be treated in the manner described in the definitive transaction agreement (or, in the event the transaction does not entail a definitive agreement to which the Company is party, in the manner determined by the Board of Directors in its capacity as
administrator of the Plan, with such determination having final and binding effect on all parties), which agreement or determination need not treat all Options and awards (or all portions of an Option or an award) in an identical manner. The
treatment specified in the transaction agreement or as determined by the Board of Directors may include (without limitation) one or more of the following with respect to each outstanding Option or award: 

(i)    Continuation of the Option or award by the Company (if the Company is the surviving corporation).

 (ii)    Assumption of the Option by the surviving corporation or its parent in a manner that complies
with Code Section 424(a) (whether or not the Option is an ISO). 
 (iii)    Substitution by the
surviving corporation or its parent of a new option for the Option in a manner that complies with Code Section 424(a) (whether or not the Option is an ISO). 

(iv)    Cancellation of the Option and a payment to the Optionee with respect to each Share subject to the
portion of the Option that is vested as of the transaction date equal to the excess of (A) the value, as determined by the Board of Directors in its absolute discretion, of the property (including cash) received by the holder of a share of
Stock as a result of the transaction, over (B) the per-Share Exercise Price of the Option (such excess, the “Spread”). Such payment shall be made in the form of cash, cash equivalents, or
securities of the surviving corporation or its parent having a value equal to the Spread. In addition, any escrow, holdback, earn-out or similar provisions in the transaction agreement may apply to such
payment to the same extent and in the same manner as such provisions apply to the holders of Stock. If the Spread applicable to an Option is zero or a negative number, then the Option may be cancelled without making a payment to the Optionee. 

(v)    Cancellation of the Option without the payment of any consideration; provided that the Optionee
shall be notified of such treatment and given an opportunity to exercise the Option (to the extent the Option is vested or becomes vested as of the effective date of the transaction) during a period of not

  
 7 

 
less than five (5) business days preceding the effective date of the transaction, unless (A) a shorter period is required to permit a timely closing of the transaction and (B) such
shorter period still offers the Optionee a reasonable opportunity to exercise the Option. Any exercise of the Option during such period may be contingent upon the closing of the transaction. 

(vi)    Suspension of the Optionee’s right to exercise the Option during a limited period of time
preceding the closing of the transaction if such suspension is administratively necessary to permit the closing of the transaction. 

(vii)    Termination of any right the Optionee has to exercise the Option prior to vesting in the Shares
subject to the Option (i.e., “early exercise”), such that following the closing of the transaction the Option may only be exercised to the extent it is vested. 

For the avoidance of doubt, the Board of Directors has discretion to accelerate, in whole or part, the vesting and exercisability of an Option or other Plan
award in connection with a corporate transaction covered by this Section 8(b). 
 (c)    Reservation of
Rights. Except as provided in this Section 8, a Participant shall have no rights by reason of (i) any subdivision or consolidation of shares of stock of any class, (ii) the payment of any dividend or (iii) any other increase
or decrease in the number of shares of stock of any class. Any issuance by the Company of shares of stock of any class, or securities convertible into shares of stock of any class, shall not affect, and no adjustment by reason thereof shall be made
with respect to, the number or Exercise Price of Shares subject to an Option. The grant of an Option pursuant to the Plan shall not affect in any way the right or power of the Company to make adjustments, reclassifications, reorganizations or
changes of its capital or business structure, to merge or consolidate or to dissolve, liquidate, sell or transfer all or any part of its business or assets. 

SECTION 9.    MISCELLANEOUS PROVISIONS. 

(a)    Securities Law Requirements. Shares shall not be issued under the Plan unless, in the opinion of counsel
acceptable to the Board of Directors, the issuance and delivery of such Shares comply with (or are exempt from) all applicable requirements of law, including (without limitation) the Securities Act, the rules and regulations promulgated thereunder,
state securities laws and regulations, and the regulations of any stock exchange or other securities market on which the Company’s securities may then be traded. The Company shall not be liable for a failure to issue Shares as a result of such
requirements. 
 (b)    No Retention Rights. Nothing in the Plan or in any right or Option granted under the Plan
shall confer upon the Participant any right to continue in Service for any period of specific duration or interfere with or otherwise restrict in any way the rights of the Company (or any Parent or Subsidiary employing or retaining the Participant)
or of the Participant, which rights are hereby expressly reserved by each, to terminate his or her Service at any time and for any reason, with or without cause. 

  
 8 

 (c)    Treatment as Compensation. Any compensation that an
individual earns or is deemed to earn under this Plan shall not be considered a part of his or her compensation for purposes of calculating contributions, accruals or benefits under any other plan or program that is maintained or funded by the
Company, a Parent or a Subsidiary. 
 (d)    Governing Law. The Plan and all awards, sales and grants under the Plan
shall be governed by, and construed in accordance with, the laws of the State of Delaware, as such laws are applied to contracts entered into and performed in such State. 

(e)    Conditions and Restrictions on Shares. Shares issued under the Plan shall be subject to such forfeiture conditions,
rights of repurchase, rights of first refusal, other transfer restrictions and such other terms and conditions as the Board of Directors may determine. Such conditions and restrictions shall be set forth in the applicable Award Agreement and shall
apply in addition to any restrictions that may apply to holders of Shares generally. In addition, Shares issued under the Plan shall be subject to conditions and restrictions imposed either by applicable law or by Company policy, as adopted from
time to time, designed to ensure compliance with applicable law or laws with which the Company determines in its sole discretion to comply including in order to maintain any statutory, regulatory or tax advantage. 

(f)    Tax Matters. 

(i)    As a condition to the award, grant, issuance, vesting, purchase, exercise or transfer of any award,
or Shares issued pursuant to any award, granted under this Plan, the Participant shall make such arrangements as the Board of Directors may require or permit for the satisfaction of any federal, state, local or foreign withholding tax obligations
that may arise in connection with such event. 
 (ii)    Unless otherwise expressly set forth in an Award
Agreement, it is intended that awards granted under the Plan shall be exempt from Code Section 409A, and any ambiguity in the terms of an Award Agreement and the Plan shall be interpreted consistently with this intent. To the extent an award is
not exempt from Code Section 409A (any such award, a “409A Award”), any ambiguity in the terms of such award and the Plan shall be interpreted in a manner that to the maximum extent permissible supports the award’s
compliance with the requirements of that statute. Notwithstanding anything to the contrary permitted under the Plan, in no event shall a modification of an Award not already subject to Code Section 409A be given effect if such modification
would cause the Award to become subject to Code Section 409A unless the parties explicitly acknowledge and consent to the modification as one having that effect. A 409A Award shall be subject to such additional rules and requirements as
specified by the Board of Directors from time to time in order for it to comply with the requirements of Code Section 409A. In this regard, if any amount under a 409A Award is payable upon a “separation from service” to an individual
who is considered a “specified employee” (as each term is defined under Code Section 409A), then no such payment shall be made prior to the date that is the earlier of (i) six months and one day after the Participant’s
separation from service or (ii) 

  
 9 

 
the Participant’s death, but only to the extent such delay is necessary to prevent such payment from being subject to Section 409A(a)(1). In addition, if a transaction subject to
Section 8(b) constitutes a payment event with respect to any 409A Award, then the transaction with respect to such award must also constitute a “change in control event” as defined in Treasury Regulation
Section 1.409A-3(i)(5) to the extent required by Code Section 409A. 

(iii)    Neither the Company nor any member of the Board of Directors shall have any liability to a
Participant in the event an award held by the Participant fails to achieve its intended characterization under applicable tax law. 
 SECTION
10.    DURATION AND AMENDMENTS; STOCKHOLDER APPROVAL. 
 (a)    Term of the Plan. The
Plan, as set forth herein, shall become effective on the date of its adoption by the Board of Directors, subject to approval of the Company’s stockholders under Subsection (d) below. The Plan shall terminate automatically 10 years after
the later of (i) the date when the Board of Directors adopted the Plan or (ii) the date when the Board of Directors approved the most recent increase in the number of Shares reserved under Section 4 that was also approved by the
Company’s stockholders. The Plan may be terminated on any earlier date pursuant to Subsection (b) below. 

(b)    Right to Amend or Terminate the Plan. Subject to Subsection (d) below, the Board of Directors may amend,
suspend or terminate the Plan at any time and for any reason. 
 (c)    Effect of Amendment or Termination. No Shares
shall be issued or sold and no Option granted under the Plan after the termination thereof, except upon exercise of an Option (or any other right to purchase Shares) granted under the Plan prior to such termination. The termination of the Plan, or
any amendment thereof, shall not affect any Share previously issued or any Option previously granted under the Plan. 

(d)    Stockholder Approval. To the extent required by applicable law, the Plan will be subject to approval of the
Company’s stockholders within 12 months of its adoption date. To the extent required by applicable law, any amendment of the Plan will be subject to the approval of the Company’s stockholders within 12 months of the amendment date if it
(i) increases the number of Shares available for issuance under the Plan (except as provided in Section 8), or (ii) materially changes the class of persons who are eligible for the grant of ISOs. In addition, an amendment effecting
any other material change to the Plan terms will be subject to approval of the Company’s stockholder only if required by applicable law. Stockholder approval shall not be required for any other amendment of the Plan. 

SECTION 11.    DEFINITIONS. 

(a)    “Award Agreement” means a Stock Grant Agreement, Stock Option Agreement or Stock Purchase
Agreement. 

  
 10 

 (b)    “Board of Directors” means the Board of
Directors of the Company, as constituted from time to time. 
 (c)    “Code” means the Internal Revenue
Code of 1986, as amended. 
 (d)    “Committee” means a committee of the Board of Directors, as
described in Section 2(a). 
 (e)    “Company” means RAPT Therapeutics, Inc., a Delaware
corporation. 
 (f)    “Consultant” means a person, excluding Employees and Outside Directors, who
performs bona fide services for the Company, a Parent3 or a Subsidiary as a consultant or advisor and who qualifies as a consultant or advisor under Rule 701(c)(1) of the Securities Act or under
Instruction A.1.(a)(1) of Form S-8 under the Securities Act. 

(g)    “Date of Grant” means the date of grant specified in the applicable Stock Option Agreement, which
date shall be the later of (i) the date on which the Board of Directors resolved to grant the Option or (ii) the first day of the Optionee’s Service. 

(h)    “Disability” means that the Optionee is unable to engage in any substantial gainful activity by
reason of any medically determinable physical or mental impairment. 
 (i)    “Employee” means any
individual who is a common-law employee of the Company, a Parent4 or a Subsidiary. 

(j)    “Exchange Act” means the Securities Exchange Act of 1934, as amended. 

(k)    “Exercise Price” means the amount for which one Share may be purchased upon exercise of an Option,
as specified by the Board of Directors in the applicable Stock Option Agreement. 
 (l)    “Fair Market
Value” means the fair market value of a Share, as determined by the Board of Directors in good faith. Such determination shall be conclusive and binding on all persons. 

(m)    “Family Member” means (i) any child, stepchild, grandchild, parent, stepparent, grandparent,
spouse, former spouse, sibling, niece, nephew, mother-in-law, father-in- law, son-in-law, daughter-in-law,
brother-in-law or sister-in-law, including adoptive relationships, (ii) any person
sharing the Optionee’s household (other than a tenant or employee), (iii) a trust in which persons described in Clause (i) or (ii) have more than 50% of the beneficial interest, (iv) a foundation in which persons described in Clause
(i) or (ii) or the Optionee control the management of assets and (v) any other entity in which persons described in Clause (i) or (ii) or the Optionee own more than 50% of the voting interests. 

 
  

	3 	 Note that special considerations apply if the Company proposes to grant awards to consultant or advisor of a
Parent company. 

	4 	 Note that special considerations apply if the Company proposes to grant awards to an Employee of a Parent
company. 

  
 11 

 (n)    “Grantee” means a person to whom the Board of
Directors has awarded Shares under the Plan. 
 (o)    “ISO” means an Option that qualifies as an
incentive stock option as described in Code Section 422(b)(p) . Notwithstanding its designation as an ISO, an Option that does not qualify as an ISO under applicable law shall be treated for all purposes as an NSO. 

(p)    “NSO” means an Option that does not qualify as an incentive stock option as described in Code
Section 422(b) or 423(b). 
 (q)    “Option” means an ISO or NSO granted under the Plan and
entitling the holder to purchase Shares. 
 (r)    “Optionee” means a person who holds an Option. 

(s)    “Outside Director” means a member of the Board of Directors who is not an Employee. 

(t)    “Parent” means any corporation (other than the Company) in an unbroken chain of corporations
ending with the Company, if each of the corporations other than the Company owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such chain. A corporation that attains the
status of a Parent on a date after the adoption of the Plan shall be considered a Parent commencing as of such date. 

(u)    “Participant” means a Grantee, Optionee or Purchaser. 

(v)    “Plan” means this RAPT Therapeutics, Inc. (f/k/a FLX Bio, Inc.) 2015 Stock Plan. 

(w)    “Purchase Price” means the consideration for which one Share may be acquired under the Plan (other
than upon exercise of an Option), as specified by the Board of Directors. 
 (x)    “Purchaser” means a
person to whom the Board of Directors has offered the right to purchase Shares under the Plan (other than upon exercise of an Option). 

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

(cc)    “Service” means service as an Employee, Outside Director or Consultant. 

(dd)    “Share” means one share of Stock, as adjusted in accordance with Section 8 (if applicable).

 (ee)    “Stock” means the Common Stock of the Company. 

(ff)    “Stock Grant Agreement” means the agreement between the Company and a Grantee who is awarded
Shares under the Plan that contains the terms, conditions and restrictions pertaining to the award of such Shares. 

  
 12 

 (gg)    “Stock Option Agreement” means the agreement
between the Company and an Optionee that contains the terms, conditions and restrictions pertaining to the Optionee’s Option. 

(hh)    “Stock Purchase Agreement” means the agreement between the Company and a Purchaser who purchases
Shares under the Plan that contains the terms, conditions and restrictions pertaining to the purchase of such Shares. 

(ii)    “Subsidiary” means any corporation (other than the Company) in an unbroken chain of corporations
beginning with the Company, if each of the corporations other than the last corporation in the unbroken chain owns stock possessing 50% or more of the total combined voting power of all classes of stock in one of the other corporations in such
chain. A corporation that attains the status of a Subsidiary on a date after the adoption of the Plan shall be considered a Subsidiary commencing as of such date. 

  
 13 

 EXHIBIT A 

SCHEDULE OF SHARES RESERVED FOR ISSUANCE
UNDER THE PLAN 
  

							
	 Date of Board

Approval
	  	Date of Stockholder
Approval	  	Number of Shares Added	  	Cumulative
Number of Shares
	 4/7/2015
	  	4/7/2015	  	Not Applicable	  	2,200,000
	 6/4/2015
	  	6/4/2015	  	4,800,000	  	7,000,000
	 4/20/2016
	  	4/20/2016	  	2,000,000	  	9,000,000
	 12/13/2017
	  	12/13/2017	  	3,243,328	  	12,243,328
	 12/17/2018
	  	12/17/2018	  	1,500,000	  	13,743,328

 SUMMARY OF MODIFICATIONS AND
AMENDMENTS TO THE PLAN 
 The following is a summary of material modifications made to the
Plan (including any material deviations from the Gunderson Dettmer precedent form used to create the Plan):EX-10.3

 Exhibit 10.3 

RAPT THERAPEUTICS, INC. 2015 STOCK PLAN 

NOTICE OF STOCK OPTION GRANT (INSTALLMENT
EXERCISE) 
 The Optionee has been granted the following option to purchase shares of the Common Stock of RAPT Therapeutics, Inc.: 

 

			
	Name of Optionee:	  	«Name»
		
	Total Number of Shares:	  	«TotalShares»
		
	Type of Option:	  	«ISO» Incentive Stock Option (ISO)
		
		  	«NSO» Nonstatutory Stock Option (NSO)
		
	Exercise Price per Share:	  	$«PricePerShare»
		
	Date of Grant:	  	«DateGrant»
		
	Date Exercisable:	  	This option may be exercised with respect to the first «Percent»% of the Shares subject to this option when the Optionee completes «CliffPeriod» months of continuous Service beginning with the Vesting
Commencement Date set forth below. This option may be exercised with respect to an additional «Fraction»% of the Shares subject to this option when the Optionee completes each month of continuous Service thereafter.
		
	Vesting Commencement Date:	  	«VestComDate»
		
	Expiration Date:	  	«ExpDate». This option expires earlier if the Optionee’s Service terminates earlier, as provided in Section 6 of the Stock Option Agreement, or if the Company engages in certain corporate transactions, as
provided in Section 8(b) of the Plan.

 By signing below, the Optionee and the Company agree that this option is granted under, and governed by the terms and
conditions of, the 2015 Stock Plan and the Stock Option Agreement. Both of these documents are attached to, and made a part of, this Notice of Stock Option Grant. Section 13 of the Stock Option Agreement includes important
acknowledgements of the Optionee. 
  

							
	OPTIONEE:	 		 	 RAPT Therapeutics, Inc.

				
	 	 		 	By:	 	 
				
		 		 	Title: 	 	 
		 		 		 	

 THE OPTION GRANTED PURSUANT TO THIS AGREEMENT AND THE SHARES ISSUABLE UPON THE EXERCISE THEREOF HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT
SUCH REGISTRATION IS NOT REQUIRED. 
 FLX BIO, INC. 2015 STOCK PLAN:

 STOCK OPTION AGREEMENT (INSTALLMENT EXERCISE) 

SECTION 1. GRANT OF OPTION. 
 (a)
Option. On the terms and conditions set forth in the Notice of Stock Option Grant and this Agreement, the Company grants to the Optionee on the Date of Grant the option to purchase at the Exercise Price the number of Shares set forth
in the Notice of Stock Option Grant. The Exercise Price is agreed to be at least 100% of the Fair Market Value per Share on the Date of Grant (110% of Fair Market Value if this option is designated as an ISO in the Notice of Stock Option Grant and
Section 3(b) of the Plan applies). This option is intended to be an ISO or an NSO, as provided in the Notice of Stock Option Grant. 

(b) $100,000 Limitation. Even if this option is designated as an ISO in the Notice of Stock Option Grant, it shall be deemed to be an
NSO to the extent (and only to the extent) required by the $100,000 annual limitation under Section 422(d) of the Code. 
 (c) Stock
Plan and Defined Terms. This option is granted pursuant to the Plan, a copy of which the Optionee acknowledges having received. The provisions of the Plan are incorporated into this Agreement by this reference. Except as otherwise defined in
this Agreement (including without limitation Section 14 hereof), capitalized terms shall have the meaning ascribed to such terms in the Plan. 

SECTION 2. RIGHT TO EXERCISE. 
 (a)
Exercisability. Subject to Subsection (b) below and the other conditions set forth in this Agreement, all or part of this option may be exercised prior to its expiration at the time or times set forth in the Notice of Stock Option Grant.

 (b) Stockholder Approval. Any other provision of this Agreement notwithstanding, no portion of this option shall be exercisable at
any time prior to the approval of the Plan by the Company’s stockholders. 

 SECTION 3. NO TRANSFER OR ASSIGNMENT OF OPTION. 

Except as otherwise provided in this Agreement, this option and the rights and privileges conferred hereby shall not be sold, pledged or
otherwise transferred (whether by operation of law or otherwise) and shall not be subject to sale under execution, attachment, levy or similar process. 

SECTION 4. EXERCISE PROCEDURES. 
 (a)
Notice of Exercise. The Optionee or the Optionee’s representative may exercise this option by: (i) signing and delivering written notice to the Company pursuant to Section 12(c) specifying the election to exercise this option,
the number of Shares for which it is being exercised and the form of payment and (ii) delivering payment, in a form permissible under Section 5, for the full amount of the Purchase Price (together with any applicable withholding taxes
under Subsection (b)). In the event that this option is being exercised by the representative of the Optionee, the notice shall be accompanied by proof (satisfactory to the Company) of the representative’s right to exercise this option. 

(b) Withholding Taxes. In the event that the Company determines that it is required to withhold any tax (including without limitation
any income tax, social insurance contributions, payroll tax, payment on account or other tax-related items arising in connection with the Optionee’s participation in the Plan and legally applicable to the
Optionee (the “Tax-Related Items”)) as a result of the grant, vesting or exercise of this option, or as a result of the transfer of shares acquired upon exercise of this option, the Optionee,
as a condition of this option, shall make arrangements satisfactory to the Company to enable it to satisfy all Tax-Related Items. The Optionee acknowledges that the responsibility for all Tax-Related Items is the Optionee’s and may exceed the amount actually withheld by the Company (or its affiliate or agent). 

(c) Issuance of Shares. After satisfying all requirements for exercise of this option, the Company shall cause to be issued one or more
certificates evidencing the Shares for which this option has been exercised. Such Shares shall be registered (i) in the name of the person exercising this option, (ii) in the names of such person and his or her spouse as community property
or as joint tenants with the right of survivorship or (iii) with the Company’s consent, in the name of a revocable trust. Until the issuance of the Shares has been entered into the books and records of the Company or a duly authorized
transfer agent of the Company, no right to vote, receive dividends or any other right as a stockholder will exist with respect to such Shares. The Company shall cause such certificates to be delivered to or upon the order of the person exercising
this option. 
 SECTION 5. PAYMENT FOR STOCK. 

(a) Cash. All or part of the Purchase Price may be paid in cash or cash equivalents. 

(b) Surrender of Stock. At the discretion of the Board of Directors, all or any part of the Purchase Price may be paid by surrendering,
or attesting to the ownership of, Shares that are already owned by the Optionee. Such Shares shall be surrendered to the Company in good form for transfer and shall be valued at their Fair Market Value as of the date when this option is exercised.

  
 2 

 (c) Exercise/Sale. All or part of the Purchase Price and any withholding taxes may be
paid by the delivery (on a form prescribed by the Company) of an irrevocable direction to a securities broker approved by the Company to sell Shares and to deliver all or part of the sales proceeds to the Company. However, payment pursuant to this
Subsection (c) shall be permitted only if (i) Stock then is publicly traded and (ii) such payment does not violate applicable law. 

SECTION 6. TERM AND EXPIRATION. 
 (a)
Basic Term. This option shall in any event expire on the expiration date set forth in the Notice of Stock Option Grant, which date is 10 years after the Date of Grant (five years after the Date of Grant if this option is designated as an ISO
in the Notice of Stock Option Grant and Section 3(b) of the Plan applies). 
 (b) Termination of Service (Except by Death). If
the Optionee’s Service terminates for any reason other than death, then this option shall expire on the earliest of the following occasions: 

(i) The expiration date determined pursuant to Subsection (a) above; 

(ii) The date three months after the termination of the Optionee’s Service for any reason other than Disability; or 

(iii) The date six months after the termination of the Optionee’s Service by reason of Disability. 

The Optionee may exercise all or part of this option at any time before its expiration under the preceding sentence, but only to the extent that this option
had become exercisable before the Optionee’s Service terminated. When the Optionee’s Service terminates, this option shall expire immediately with respect to the number of Shares for which this option is not yet exercisable. In the event
that the Optionee dies after termination of Service but before the expiration of this option, all or part of this option may be exercised (prior to expiration) by the executors or administrators of the Optionee’s estate or by any person who has
acquired this option directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that this option had become exercisable before the Optionee’s Service terminated. Once this option (or portion thereof)
has terminated, the Optionee shall have no further rights with respect to the option (or portion thereof) or to the underlying Shares. 

(c) Death of the Optionee. If the Optionee dies while in Service, then this option shall expire on the earlier of the following dates:

 (i) The expiration date determined pursuant to Subsection (a) above; or 

(ii) The date 12 months after the Optionee’s death. 

  
 3 

 All or part of this option may be exercised at any time before its expiration under the preceding sentence
by the executors or administrators of the Optionee’s estate or by any person who has acquired this option directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that this option had become
exercisable before the Optionee’s death. When the Optionee dies, this option shall expire immediately with respect to the number of Shares for which this option is not yet exercisable. Once this option (or portion thereof) has terminated, the
Optionee shall have no further rights with respect to the option (or portion thereof) or to the underlying Shares. 
 (d) Extension of
Post-Termination Exercise Periods. Following the date on which the Company’s Stock is first listed for trading on an established securities market, if during any part of the exercise period described in Subsections (b)(ii) or (iii) or
Subsection (c)(ii) above the exercise of this option would be prohibited solely because the issuance of Shares upon such exercise would violate the registration requirements under the Securities Act or a similar provision of other applicable law,
then instead of terminating at the end of such prescribed period, the then-vested portion of this option will instead remain outstanding and not expire until the earlier of (i) the expiration date determined pursuant to Section 6(a) above
or (ii) the date on which the then-vested portion of this option has been exercisable without violation of applicable law for the aggregate period (which need not be consecutive) after termination of the Optionee’s Service specified in the
applicable Subsection above. 
 (e) Part-Time Employment and Leaves of Absence. If the Optionee commences working on a part-time
basis, then the Company may adjust the vesting schedule set forth in the Notice of Stock Option Grant. If the Optionee goes on a leave of absence, then the Company may adjust the vesting schedule set forth in the Notice of Stock Option Grant in
accordance with the Company’s leave of absence policy or the terms of such leave. Except as provided in the preceding sentence, Service shall be deemed to continue for any purpose under this Agreement while the Optionee is on a bona fide
leave of absence, if (i) such leave was approved by the Company in writing and (ii) continued crediting of Service for such purpose is expressly required by the terms of such leave or by applicable law (as determined by the Company).
Service shall be deemed to terminate when such leave ends, unless the Optionee immediately returns to active work. 
 (f) Notice
Concerning ISO Treatment. Even if this option is designated as an ISO in the Notice of Stock Option Grant, it ceases to qualify for favorable tax treatment as an ISO to the extent that it is exercised: 

(i) More than three months after the date when the Optionee ceases to be an Employee for any reason other than death or
permanent and total disability (as defined in Section 22(e)(3) of the Code); 
 (ii) More than 12 months after the date
when the Optionee ceases to be an Employee by reason of permanent and total disability (as defined in Section 22(e)(3) of the Code); or 

  
 4 

 (iii) More than three months after the date when the Optionee has been on a
leave of absence for three months, unless the Optionee’s reemployment rights following such leave were guaranteed by statute or by contract. 

SECTION 7. RIGHT OF FIRST REFUSAL. 
 (a)
Right of First Refusal. In the event that the Optionee proposes to sell, pledge or otherwise transfer to a third party any Shares acquired under this Agreement, or any interest in such Shares, the Company shall have the Right of First Refusal
with respect to all (and not less than all) of such Shares. If the Optionee desires to transfer Shares acquired under this Agreement, the Optionee shall give a written Transfer Notice to the Company describing fully the proposed transfer, including
the number of Shares proposed to be transferred, the proposed transfer price, the name and address of the proposed Transferee and proof satisfactory to the Company that the proposed sale or transfer will not violate any applicable federal, State or
foreign securities laws. The Transfer Notice shall be signed both by the Optionee and by the proposed Transferee and must constitute a binding commitment of both parties to the transfer of the Shares. The Company shall have the right to purchase
all, and not less than all, of the Shares on the terms of the proposal described in the Transfer Notice (subject, however, to any change in such terms permitted under Subsection (b) below) by delivery of a notice of exercise of the Right of
First Refusal within 30 days after the date when the Transfer Notice was received by the Company. 
 (b) Transfer of Shares. If the
Company fails to exercise its Right of First Refusal within 30 days after the date when it received the Transfer Notice, the Optionee may, not later than 90 days following receipt of the Transfer Notice by the Company, conclude a transfer
of the Shares subject to the Transfer Notice on the terms and conditions described in the Transfer Notice, provided that any such sale is made in compliance with applicable federal, State and foreign securities laws and not in violation of any other
contractual restrictions to which the Optionee is bound. Any proposed transfer on terms and conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Optionee, shall again be subject to the
Right of First Refusal and shall require compliance with the procedure described in Subsection (a) above. If the Company exercises its Right of First Refusal, the parties shall consummate the sale of the Shares on the terms set forth in the
Transfer Notice within 60 days after the date when the Company received the Transfer Notice (or within such longer period as may have been specified in the Transfer Notice); provided, however, that in the event the Transfer Notice provided that
payment for the Shares was to be made in a form other than cash or cash equivalents paid at the time of transfer, the Company shall have the option of paying for the Shares with cash or cash equivalents equal to the present value of the
consideration described in the Transfer Notice. 
 (c) Additional or Exchanged Securities and Property. In the event of a merger or
consolidation of the Company, a sale of all or substantially all of the Company’s stock or assets, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a
form other than stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property
(including cash or cash 

  
 5 

 
equivalents) that are by reason of such transaction exchanged for, or distributed with respect to, any Shares subject to this Section 7 shall immediately be subject to the Right of First
Refusal. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made to the number and/or class of the Shares subject to this Section 7. 

(d) Termination of Right of First Refusal. Any other provision of this Section 7 notwithstanding, in the event that the Stock is
readily tradable on an established securities market when the Optionee desires to transfer Shares, the Company shall have no Right of First Refusal, and the Optionee shall have no obligation to comply with the procedures prescribed by
Subsections (a) and (b) above. 
 (e) Permitted Transfers. This Section 7 shall not apply to (i) a transfer by
beneficiary designation, will or intestate succession or (ii) a transfer to one or more members of the Optionee’s Immediate Family or to a trust established by the Optionee for the benefit of the Optionee and/or one or more members of the
Optionee’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by all provisions of this Agreement. If the Optionee transfers any Shares acquired under this Agreement,
either under this Subsection (e) or after the Company has failed to exercise the Right of First Refusal, then this Agreement shall apply to the Transferee to the same extent as to the Optionee. 

(f) Termination of Rights as Stockholder. If the Company makes available, at the time and place and in the amount and form provided in
this Agreement, the consideration for the Shares to be purchased in accordance with this Section 7, then after such time the person from whom such Shares are to be purchased shall no longer have any rights as a holder of such Shares (other than
the right to receive payment of such consideration in accordance with this Agreement). Such Shares shall be deemed to have been purchased in accordance with the applicable provisions hereof, whether or not the certificate(s) therefor have been
delivered as required by this Agreement. 
 (g) Assignment of Right of First Refusal. The Board of Directors may freely assign the
Company’s Right of First Refusal, in whole or in part. Any person who accepts an assignment of the Right of First Refusal from the Company shall assume all of the Company’s rights and obligations under this Section 7. 

SECTION 8. LEGALITY OF INITIAL ISSUANCE. 

No Shares shall be issued upon the exercise of this option unless and until the Company has determined that: 

(a) It and the Optionee have taken any actions required to register the Shares under the Securities Act or to perfect an
exemption from the registration requirements thereof; 
 (b) Any applicable listing requirement of any stock exchange or
other securities market on which Stock is listed has been satisfied; and 

  
 6 

 (c) Any other applicable provision of federal, State or foreign law has been
satisfied. 
 SECTION 9. NO REGISTRATION RIGHTS. 

The Company may, but shall not be obligated to, register or qualify the sale of Shares under the Securities Act or any other applicable law.
The Company shall not be obligated to take any affirmative action in order to cause the sale of Shares under this Agreement to comply with any law. 

SECTION 10. RESTRICTIONS ON TRANSFER OF SHARES. 

(a) Securities Law Restrictions. Regardless of whether the offer and sale of Shares under the Plan have been registered under the
Securities Act or have been registered or qualified under the securities laws of any State or other relevant jurisdiction, the Company at its discretion may impose restrictions upon the sale, pledge or other transfer of such Shares (including the
placement of appropriate legends on the stock certificates (or electronic equivalent) or the imposition of stop-transfer instructions) and may refuse (or may be required to refuse) to transfer Shares acquired hereunder (or Shares proposed to be
transferred in a subsequent transfer) if, in the judgment of the Company, such restrictions, legends or refusal are necessary or appropriate to achieve compliance with the Securities Act or other relevant securities or other laws, including without
limitation under Regulation S of the Securities Act or pursuant to another available exemption from registration.
 (b) Market Stand-Off. In connection with any underwritten public offering by the Company of its equity securities pursuant to an effective registration statement filed under the Securities Act, including the Company’s
initial public offering, the Optionee or a Transferee shall not directly or indirectly sell, make any short sale of, loan, hypothecate, pledge, offer, grant or sell any option or other contract for the purchase of, purchase any option or other
contract for the sale of, or otherwise dispose of or transfer, or agree to engage in any of the foregoing transactions with respect to, any Shares acquired under this Agreement without the prior written consent of the Company or its managing
underwriter. Such restriction (the “Market Stand-Off”) shall be in effect for such period of time following the date of the final prospectus for the offering as may be requested by the Company
or such underwriter. In no event, however, shall such period exceed 180 days plus such additional period as may reasonably be requested by the Company or such underwriter to accommodate regulatory restrictions on (i) the publication or other
distribution of research reports or (ii) analyst recommendations and opinions, including (without limitation) the restrictions set forth in Rule 2711(f)(4) of the National Association of Securities Dealers and Rule 472(f)(4) of the
New York Stock Exchange, as amended, or any similar successor rules. The Market Stand-Off shall in any event terminate two years after the date of the Company’s initial public offering. In the event of
the declaration of a stock dividend, a spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities without
receipt of consideration, any new, substituted or additional securities which are by reason of such transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares
thereby become convertible, shall immediately be subject to the Market Stand-Off. In order to enforce the Market Stand-Off, the Company may impose stop-transfer
instructions with respect to the Shares acquired under this Agreement until the end of the applicable stand-off period. The Company’s underwriters shall be beneficiaries of the agreement set forth in this
Subsection (b). This Subsection (b) shall not apply to Shares registered in the public offering under the Securities Act. 

  
 7 

 (c) Investment Intent at Grant. The Optionee represents and agrees that the Shares to
be acquired upon exercising this option will be acquired for investment, and not with a view to the sale or distribution thereof. 
 (d)
Investment Intent at Exercise. In the event that the sale of Shares under the Plan is not registered under the Securities Act but an exemption is available that requires an investment representation or other representation, the Optionee shall
represent and agree at the time of exercise that the Shares being acquired upon exercising this option are being acquired for investment, and not with a view to the sale or distribution thereof, and shall make such other representations as are
deemed necessary or appropriate by the Company and its counsel, including (if applicable because the Company is relying on Regulation S under the Securities Act) that as of the date of exercise the Optionee is (i) not a U.S. Person;
(ii) not acquiring the Shares on behalf, or for the account or benefit, of a U.S. Person; and (iii) is not exercising the option in the United States. 

(e) Legends. All certificates evidencing Shares purchased under this Agreement shall bear the following legend: 

“THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, ENCUMBERED OR IN ANY MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH
THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY CERTAIN RIGHTS OF FIRST REFUSAL UPON AN ATTEMPTED TRANSFER OF THE
SHARES. IN ADDITION, THE SHARES ARE SUBJECT TO RESTRICTIONS ON TRANSFER FOR A LIMITED PERIOD FOLLOWING THE EFFECTIVE DATE OF THE UNDERWRITTEN PUBLIC OFFERING OF THE COMPANY’S SECURITIES AND MAY NOT BE SOLD OR OTHERWISE DISPOSED OF BY THE HOLDER
WITHOUT THE CONSENT OF THE COMPANY OR THE MANAGING UNDERWRITER. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE HOLDER HEREOF WITHOUT CHARGE.” 

All certificates evidencing Shares purchased under this Agreement in an unregistered transaction shall bear the following legend (and such other restrictive
legends as are required or deemed advisable under the provisions of any applicable law): 
 “THE SHARES REPRESENTED HEREBY HAVE NOT BEEN
REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”) OR ANY SECURITIES LAWS OF ANY U.S. STATE, AND MAY NOT BE SOLD, REOFFERED, PLEDGED, ASSIGNED, ENCUMBERED OR OTHERWISE 

  
 8 

 
TRANSFERRED OR DISPOSED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED. IN
THE ABSENCE OF REGISTRATION OR THE AVAILABILITY (CONFIRMED BY OPINION OF COUNSEL) OF AN ALTERNATIVE EXEMPTION FROM REGISTRATION UNDER THE ACT (INCLUDING WITHOUT LIMITATION IN ACCORDANCE WITH REGULATION S UNDER THE ACT), THESE SHARES MAY NOT BE SOLD,
REOFFERED, PLEDGED, ASSIGNED, ENCUMBERED OR OTHERWISE TRANSFERRED OR DISPOSED OF. HEDGING TRANSACTIONS INVOLVING THESE SHARES MAY NOT BE CONDUCTED UNLESS IN COMPLIANCE WITH THE ACT.” 

(f) Removal of Legends. If, in the opinion of the Company and its counsel, any legend placed on a stock certificate representing Shares
sold under this Agreement is no longer required, the holder of such certificate shall be entitled to exchange such certificate for a certificate representing the same number of Shares but without such legend. 

(g) Administration. Any determination by the Company and its counsel in connection with any of the matters set forth in this
Section 10 shall be conclusive and binding on the Optionee and all other persons. 
 SECTION 11. ADJUSTMENT OF SHARES. 

In the event of any transaction described in Section 8(a) of the Plan, the terms of this option (including, without limitation, the number
and kind of Shares subject to this option and the Exercise Price) shall be adjusted as set forth in Section 8(a) of the Plan. In the event that the Company is a party to a merger or consolidation or in the event of a sale of all or
substantially all of the Company’s stock or assets, this option shall be subject to the treatment provided by the Board of Directors in its sole discretion, as provided in Section 8(b) of the Plan. 

SECTION 12. MISCELLANEOUS PROVISIONS. 

(a) Rights as a Stockholder. Neither the Optionee nor the Optionee’s representative shall have any rights as a stockholder with
respect to any Shares subject to this option until the Optionee or the Optionee’s representative becomes entitled to receive such Shares by filing a notice of exercise and paying the Purchase Price pursuant to Sections 4 and 5. 

(b) No Retention Rights. Nothing in this option or in the Plan shall confer upon the Optionee any right to continue in Service for any
period of specific duration or interfere with or otherwise restrict in any way the rights of the Company (or any Parent or Subsidiary employing or retaining the Optionee) or of the Optionee, which rights are hereby expressly reserved by each, to
terminate his or her Service at any time and for any reason, with or without cause. 
 (c) Notice. Any notice required by the terms
of this Agreement shall be given in writing. It shall be deemed effective upon (i) personal delivery, (ii) deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid, (iii) deposit
with Federal Express Corporation, with shipping charges prepaid or (iv) deposit with any internationally recognized express mail courier service. Notice shall be addressed to the Company at its principal executive office and to the Optionee at
the address that he or she most recently provided to the Company in accordance with this Subsection (c). 

  
 9 

 (d) Modifications and Waivers. No provision of this Agreement shall be modified,
waived or discharged unless the modification, waiver or discharge is agreed to in writing and signed by the Optionee and by an authorized officer of the Company (other than the Optionee). No waiver by either party of any breach of, or of compliance
with, any condition or provision of this Agreement by the other party shall be considered a waiver of any other condition or provision or of the same condition or provision at another time. 

(e) Entire Agreement. The Notice of Stock Option Grant, this Agreement and the Plan constitute the entire contract between the parties
hereto with regard to the subject matter hereof. They supersede any other agreements, representations or understandings (whether oral or written and whether express or implied) that relate to the subject matter hereof. 

(f) Choice of Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, as such
laws are applied to contracts entered into and performed in such State. 
 SECTION 13. ACKNOWLEDGEMENTS OF THE OPTIONEE. 

In addition to the other terms, conditions and restrictions imposed on this option and the Shares issuable under this option pursuant to this
Agreement and the Plan, the Optionee expressly acknowledges being subject to Sections 7 (Right of First Refusal), 8 (Legality of Initial Issuance) and 10 (Restrictions on Transfer of Shares, including without limitation the Market Stand-Off), as well as the following provisions: 
 (a) Tax Consequences (No Liability for Discounted
Options). The Optionee agrees that the Company does not have a duty to design or administer the Plan or its other compensation programs in a manner that minimizes the Optionee’s tax liabilities. The Optionee shall not make any claim against
the Company or its Board of Directors, officers or employees related to tax liabilities arising from this option or the Optionee’s other compensation. In particular, any Optionee subject to U.S. taxation acknowledges that this option is exempt
from Section 409A of the Code only if the Exercise Price is at least equal to the Fair Market Value per Share on the Date of Grant. Since Shares are not traded on an established securities market, the determination of their Fair Market Value is
made by the Board of Directors or by an independent valuation firm retained by the Company. The Optionee acknowledges that there is no guarantee in either case that the Internal Revenue Service will agree with the valuation, and the Optionee shall
not make any claim against the Company or its Board of Directors, officers or employees in the event that the Internal Revenue Service asserts that the valuation was too low. 

(b) Electronic Delivery of Documents. The Optionee agrees to accept by email all documents relating to the Company, the Plan or this
option and all other documents that the Company is required to deliver to its security holders (including, without limitation, disclosures that may be required by the Securities and Exchange Commission). The Optionee

  
 10 

 
also agrees that the Company may deliver these documents by posting them on a website maintained by the Company or by a third party under contract with the Company. If the Company posts these
documents on a website, it shall notify the Optionee by email of their availability. The Optionee acknowledges that he or she may incur costs in connection with electronic delivery, including the cost of accessing the internet and printing fees, and
that an interruption of internet access may interfere with his or her ability to access the documents. This consent shall remain in effect until this option expires or until the Optionee gives the Company written notice that it should deliver paper
documents. 
 (c) No Notice of Expiration Date. The Optionee agrees that the Company and its officers, employees, attorneys and
agents do not have any obligation to notify him or her prior to the expiration of this option pursuant to Section 6, regardless of whether this option will expire at the end of its full term or on an earlier date related to the termination of
the Optionee’s Service. The Optionee further agrees that he or she has the sole responsibility for monitoring the expiration of this option and for exercising this option, if at all, before it expires. This Subsection (c) shall supersede
any contrary representation that may have been made, orally or in writing, by the Company or by an officer, employee, attorney or agent of the Company. 

(d) Waiver of Statutory Information Rights. The Optionee acknowledges and agrees that, upon exercise of this option and until the first
sale of the Company’s Stock to the general public pursuant to a registration statement filed under the Securities Act, he or she will be deemed to have waived any rights the Optionee might otherwise have had under Section 220 of the
Delaware General Corporation Law (or under similar rights under other applicable law) to inspect for any proper purpose and to make copies and extracts from the Company’s stock ledger, a list of its stockholders and its other books and records
or the books and records of any subsidiary. This waiver applies only in the Optionee’s capacity as a stockholder and does not affect any other inspection rights the Optionee may have under other law or pursuant to a written agreement with
the Company.
 (e) Plan Discretionary. The Optionee understands and acknowledges that (i) the Plan is entirely discretionary,
(ii) the Company and the Optionee’s employer have reserved the right to amend, suspend or terminate the Plan at any time, (iii) the grant of an option does not in any way create any contractual or other right to receive
additional grants of options (or benefits in lieu of options) at any time or in any amount and (iv) all determinations with respect to any additional grants, including (without limitation) the times when options will be granted, the number of
Shares offered, the Exercise Price and the vesting schedule, will be at the sole discretion of the Company. 
 (f) Termination of
Service. The Optionee understands and acknowledges that participation in the Plan ceases upon termination of his or her Service for any reason, except as may explicitly be provided otherwise in the Plan or this Agreement. 

(g) Extraordinary Compensation. The value of this option shall be an extraordinary item of compensation outside the scope of the
Optionee’s employment contract, if any, and shall not be considered a part of his or her normal or expected compensation for purposes of calculating severance, resignation, redundancy or end-of-service payments, bonuses, long-service awards, pension or retirement benefits or similar payments. 

  
 11 

 (h) Authorization to Disclose. The Optionee hereby authorizes and directs the
Optionee’s employer to disclose to the Company or any Subsidiary any information regarding the Optionee’s employment, the nature and amount of the Optionee’s compensation and the fact and conditions of the Optionee’s
participation in the Plan, as the Optionee’s employer deems necessary or appropriate to facilitate the administration of the Plan. 

(i) Personal Data Authorization. The Optionee consents to the collection, use and transfer of personal data as described in this
Subsection (i). The Optionee understands and acknowledges that the Company, the Optionee’s employer and the Company’s other Subsidiaries hold certain personal information regarding the Optionee for the purpose of managing and
administering the Plan, including (without limitation) the Optionee’s name, home address, telephone number, date of birth, social insurance number, salary, nationality, job title, any Shares or directorships held in the Company and details of
all options or any other entitlements to Shares awarded, canceled, exercised, vested, unvested or outstanding in the Optionee’s favor (the “Data”). The Optionee further understands and acknowledges that the Company and/or its
Subsidiaries will transfer Data among themselves as necessary for the purpose of implementation, administration and management of the Optionee’s participation in the Plan and that the Company and/or any Subsidiary may each further transfer Data
to any third party assisting the Company in the implementation, administration and management of the Plan. The Optionee understands and acknowledges that the recipients of Data may be located in the United States or elsewhere. The Optionee
authorizes such recipients to receive, possess, use, retain and transfer Data, in electronic or other form, for the purpose of administering the Optionee’s participation in the Plan, including a transfer to any broker or other third party with
whom the Optionee elects to deposit Shares acquired under the Plan of such Data as may be required for the administration of the Plan and/or the subsequent holding of Shares on the Optionee’s behalf. The Optionee may, at any time, view the
Data, require any necessary modifications of Data or withdraw the consents set forth in this Subsection (i) by contacting the Company in writing. 

SECTION 14. DEFINITIONS. 
 (a)
“Agreement” shall mean this Stock Option Agreement. 
 (b) “Board of Directors” shall mean the Board of
Directors of the Company, as constituted from time to time or, if a Committee has been appointed, such Committee. 
 (c)
“Company” shall mean RAPT Therapeutics, Inc., a Delaware corporation. 
 (d) “Immediate Family” shall mean
any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, sibling, mother-in-law,
father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law
and shall include adoptive relationships. 
 (e) “Optionee” shall mean the person named in the Notice of Stock Option
Grant. 
 (f) “Plan” shall mean the RAPT Therapeutics, Inc. 2015 Stock Plan, as in effect on the Date of Grant. 

  
 12 

 (g) “Purchase Price” shall mean the Exercise Price multiplied by the number
of Shares with respect to which this option is being exercised. 
 (h) “Right of First Refusal” shall mean the
Company’s right of first refusal described in Section 7. 
 (i) “Service” means service as an Employee, Outside
Director or Consultant. 
 (j) “Transferee” shall mean any person to whom the Optionee has directly or indirectly
transferred any Share acquired under this Agreement. 
 (k) “Transfer Notice” shall mean the notice of a proposed transfer
of Shares described in Section 7. 
 (l) “U.S. Person” shall mean a person described in Rule 902(k) of Regulation S of
the Securities Act (or any successor rule or provision), which generally defines a U.S. person as any natural person resident in the United States, any estate of which any executor or administrator is a U.S. Person, or any trust of which of any
trustee is a U.S. Person. 

  
 13 

 RAPT THERAPEUTICS, INC. 2015 STOCK
PLAN 
 NOTICE OF STOCK OPTION EXERCISE
(INSTALLMENT EXERCISE) 
 You must sign this Notice on Page 3 before submitting it to the
Company. 
 OPTIONEE INFORMATION: 
  

									
	 Name:
	 	 	 		  	Social Security Number: 	  	 
					
	 Address: 
	 	 	 		  	Employee Number:	  	 
					
		 	 	 		  		  	

 OPTION INFORMATION: 

 

			
	 Date of Grant:
                             ,
20        
	  	Type of Stock Option:
		
	 Exercise Price per Share:
$                
	  	☐ Nonstatutory (NSO)
		
	 Total number of shares of Common Stock of FLX Bio, Inc. (the “Company”) covered by the
option:                     
	  	☐ Incentive (ISO)

 EXERCISE INFORMATION: 

Number of shares of Common Stock of the Company for which the option is being exercised now:
                        . (These shares are referred to below as the “Purchased Shares.”) 

Total Exercise Price for the Purchased Shares:
$                     
 Form of payment enclosed
[check all that apply]: 
  

	☐	 Check for
$                , payable to “RAPT Therapeutics, Inc.” 

  

	☐	 Certificate(s) for
                     shares of Common Stock of the Company. These shares will be valued as of the date this notice is received by the Company.
[Requires Company consent.] 

  

	☐	 Attestation Form covering
                     shares of Common Stock of the Company. These shares will be valued as of the date this notice is received by the Company.
[Requires Company consent.] 

 Name(s) in which the Purchased Shares should be registered [please review the attached
explanation of the available forms of ownership, and then check one box]: 
  

	☐	 In my name only 

							
	 ☐
	  	In the names of my spouse and myself as community property	  		  	My spouse’s name (if applicable):
				
	 ☐
	  	In the names of my spouse and myself as community property with the right of survivorship	  		  	                                      
                                      
				
	 ☐
	  	In the names of my spouse and myself as joint tenants with the right of survivorship	  		  	
				
	 ☐
	  	In the name of an eligible revocable trust [requires Stock Transfer Agreement]	  		  	Full legal name of revocable trust:
				
		  		  		  	 
				
		  		  		  	 

  

							
			
	The certificate for the Purchased Shares should be sent to the following address:	  		  	 
			
		  		  	 
			
		  		  	 
			
		  		  	 

 REPRESENTATIONS AND ACKNOWLEDGEMENTS OF THE
OPTIONEE: 
  

	1.	 I represent and warrant to the Company that I am acquiring and will hold the Purchased Shares for investment
for my account only, and not with a view to, or for resale in connection with, any “distribution” of the Purchased Shares within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). 

 

	2.	 I understand that my purchase of the Purchased Shares has not been registered under the Securities Act by
reason of a specific exemption therefrom and that the Purchased Shares must be held indefinitely, unless they are subsequently registered under the Securities Act or I obtain an opinion of counsel (in form and substance satisfactory to the Company
and its counsel) that registration is not required. 

  

	3.	 I acknowledge that the Company is under no obligation to register the Purchased Shares or any sale or transfer
thereof. 

  

	4.	 I am aware of Rule 144 under the Securities Act, which permits limited public resales of securities acquired in
a non-public offering, subject to the satisfaction of certain conditions. These conditions may include (without limitation) that certain current public information about the issuer be available, that the
resale occur only after a holding period required by Rule 144 has been satisfied, that the sale occur through an unsolicited “broker’s transaction” and that the amount of securities being sold during any three-month period not exceed
specified limitations. I understand that the conditions for resale set forth in Rule 144 have not been satisfied as of the date set forth below, and that the Company is not required to take action to satisfy any conditions applicable to it.

  

	5.	 I will not sell, transfer or otherwise dispose of the Purchased Shares in violation of the Securities Act, the
Securities Exchange Act of 1934, or the rules promulgated thereunder, including Rule 144 under the Securities Act. 

  

	6.	 I acknowledge that I have received and had access to such information as I consider necessary or appropriate
for deciding whether to invest in the Purchased Shares and that I had an opportunity to ask questions and receive answers from the Company regarding the terms and conditions of the issuance of the Purchased Shares. 

  
 2 

	7.	 I am aware that my investment in the Company is a speculative investment that has limited liquidity and is
subject to the risk of complete loss. I am able, without impairing my financial condition, to hold the Purchased Shares for an indefinite period and to suffer a complete loss of my investment in the Purchased Shares. 

 

	8.	 I acknowledge that the Purchased Shares remain subject to the Company’s right of first refusal and the
market stand-off (sometimes referred to as the “lock-up”), all in accordance with the applicable Notice of Stock Option Grant and Stock Option Agreement.

  

	9.	 I acknowledge that I am acquiring the Purchased Shares subject to all other terms of the Notice of Stock Option
Grant and Stock Option Agreement. 

  

	10.	 I acknowledge that I have received a copy of the Company’s explanation of the forms of ownership available
for my Purchased Shares. I acknowledge that the Company has encouraged me to consult my own adviser to determine the form of ownership that is appropriate for me. In the event that I choose to transfer my Purchased Shares to a trust, I agree to sign
a Stock Transfer Agreement. In the event that I choose to transfer my Purchased Shares to a trust that does not satisfy the requirements described in the attached explanation (i.e., a trust that is not an eligible revocable trust), I also
acknowledge that the transfer will be treated as a “disposition” for tax purposes. As a result, the favorable ISO tax treatment will be unavailable and other unfavorable tax consequences may occur. 

 

	11.	 I acknowledge that I have received a copy of the Company’s explanation of the federal income tax
consequences of an option exercise. I acknowledge that the Company has encouraged me to consult my own adviser to determine the tax consequences of acquiring the Purchased Shares at this time. 

 

	12.	 I agree that the Company does not have a duty to design or administer the 2015 Stock Plan or its other
compensation programs in a manner that minimizes my tax liabilities. I will not make any claim against the Company or its Board of Directors, officers or employees related to tax liabilities arising from my options or my other compensation. In
particular, I acknowledge that my options are exempt from section 409A of the Internal Revenue Code only if the exercise price per share is at least equal to the fair market value per share of the Company’s Common Stock at the time the option
was granted by the Company’s Board of Directors. Since shares of the Company’s Common Stock are not traded on an established securities market, the determination of their fair market value was made by the Company’s Board of Directors
or by an independent valuation firm retained by the Company. I acknowledge that there is no guarantee in either case that the Internal Revenue Service will agree with the valuation, and I will not make any claim against the Company or its Board of
Directors, officers or employees in the event that the Internal Revenue Service asserts that the valuation was too low. 

  

	13.	 I agree to seek the consent of my spouse to the extent required by the Company to enforce the foregoing.

  

					
	SIGNATURE:	 		 	DATE:
			
	   
	 		 	   

  
 3 

 RAPT THERAPEUTICS, INC. 2015 STOCK
PLAN 
 NOTICE OF STOCK OPTION GRANT
(EARLY EXERCISE) 
 The Optionee has been granted the following option to purchase shares of the Common Stock of FLX Bio,
Inc.: 

			
		
	Name of Optionee:	  	«Name»
		
	Total Number of Shares:	  	«TotalShares»
		
	Type of Option:	  	«ISO» Incentive Stock Option (ISO)
		
		  	«NSO» Nonstatutory Stock Option (NSO)
		
	Exercise Price per Share:	  	$«PricePerShare»
		
	Date of Grant:	  	«DateGrant»
		
	Date Exercisable:	  	This option may be exercised at any time after the Date of Grant for all or any part of the Shares subject to this option.
		
	Vesting Commencement Date:	  	«VestComDate»
		
	Vesting Schedule:	  	The Right of Repurchase shall lapse with respect to the first «Percent»% of the Shares subject to this option when the Optionee completes «CliffPeriod» months of continuous Service beginning with the Vesting
Commencement Date set forth above. The Right of Repurchase shall lapse with respect to an additional «Fraction»% of the Shares subject to this option when the Optionee completes each month of continuous Service thereafter.
		
	Expiration Date:	  	«ExpDate». This option expires earlier if the Optionee’s Service terminates earlier, as provided in Section 6 of the Stock Option Agreement, or if the Company engages in certain corporate transactions, as
provided in Section 8(b) of the Plan.

 By signing below, the Optionee and the Company agree that this option is granted under, and governed by the terms and
conditions of, the 2015 Stock Plan and the Stock Option Agreement. Both of these documents are attached to, and made a part of, this Notice of Stock Option Grant. Section 14 of the Stock Option Agreement includes important
acknowledgements of the Optionee. 
  

									
	OPTIONEE:	 		 	RAPT THERAPEUTICS INC.
					
		 	 	 		 	By:	 	 
					
		 		 		 	Title:	 	 

 THE OPTION GRANTED PURSUANT TO THIS AGREEMENT AND THE SHARES ISSUABLE UPON THE EXERCISE THEREOF HAVE NOT
BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND ITS COUNSEL, THAT
SUCH REGISTRATION IS NOT REQUIRED. 
 RAPT THERAPEUTICS, INC. 2015 STOCK
PLAN: 
 STOCK OPTION AGREEMENT (EARLY
EXERCISE) 
 SECTION 1. GRANT OF OPTION. 

(a) Option. On the terms and conditions set forth in the Notice of Stock Option Grant and this Agreement, the Company grants to
the Optionee on the Date of Grant the option to purchase at the Exercise Price the number of Shares set forth in the Notice of Stock Option Grant. The Exercise Price is agreed to be at least 100% of the Fair Market Value per Share on the Date of
Grant (110% of Fair Market Value if this option is designated as an ISO in the Notice of Stock Option Grant and Section 3(b) of the Plan applies). This option is intended to be an ISO or an NSO, as provided in the Notice of Stock Option Grant.

 (b) $100,000 Limitation. Even if this option is designated as an ISO in the Notice of Stock Option Grant, it shall be deemed to be
an NSO to the extent (and only to the extent) required by the $100,000 annual limitation under Section 422(d) of the Code. 
 (c)
Stock Plan and Defined Terms. This option is granted pursuant to the Plan, a copy of which the Optionee acknowledges having received. The provisions of the Plan are incorporated into this Agreement by this reference. Except as otherwise
defined in this Agreement (including without limitation Section 15 hereof), capitalized terms shall have the meaning ascribed to such terms in the Plan. 

SECTION 2. RIGHT TO EXERCISE. 
 (a)
Exercisability. Subject to Subsection (b) below and the other conditions set forth in this Agreement, all or part of this option may be exercised prior to its expiration at the time or times set forth in the Notice of Stock Option Grant.
Shares purchased by exercising this option may be subject to the Right of Repurchase under Section 7. 
 (b) Stockholder
Approval. Any other provision of this Agreement notwithstanding, no portion of this option shall be exercisable at any time prior to the approval of the Plan by the Company’s stockholders. 

 SECTION 3. NO TRANSFER OR ASSIGNMENT OF OPTION. 

Except as otherwise provided in this Agreement, this option and the rights and privileges conferred hereby shall not be sold, pledged or
otherwise transferred (whether by operation of law or otherwise) and shall not be subject to sale under execution, attachment, levy or similar process. 

SECTION 4. EXERCISE PROCEDURES. 
 (a)
Notice of Exercise. The Optionee or the Optionee’s representative may exercise this option by: (i) signing and delivering written notice to the Company pursuant to Section 13(c) specifying the election to exercise this option,
the number of Shares for which it is being exercised and the form of payment and (ii) delivering payment, in a form permissible under Section 5, for the full amount of the Purchase Price (together with any applicable withholding taxes
under Subsection (b)). In the event that this option is being exercised by the representative of the Optionee, the notice shall be accompanied by proof (satisfactory to the Company) of the representative’s right to exercise this option. In the
event of a partial exercise of this option, Shares shall be deemed to have been purchased in the order in which they vest in accordance with the Notice of Stock Option Grant. 

(b) Withholding Taxes. In the event that the Company determines that it is required to withhold any tax (including without limitation
any income tax, social insurance contributions, payroll tax, payment on account or other tax-related items arising in connection with the Optionee’s participation in the Plan and legally applicable to the
Optionee (the “Tax-Related Items”)) as a result of the grant, vesting or exercise of this option, or as a result of the vesting or transfer of shares acquired upon exercise of this option, the
Optionee, as a condition of this option, shall make arrangements satisfactory to the Company to enable it to satisfy all Tax-Related Items. The Optionee acknowledges that the responsibility for all Tax-Related Items is the Optionee’s and may exceed the amount actually withheld by the Company (or its affiliate or agent). 

(c) Issuance of Shares. After satisfying all requirements for exercise of this option, the Company shall cause to be issued one or more
certificates evidencing the Shares for which this option has been exercised. Such Shares shall be registered (i) in the name of the person exercising this option, (ii) in the names of such person and his or her spouse as community property
or as joint tenants with the right of survivorship or (iii) with the Company’s consent, in the name of a revocable trust. Until the issuance of the Shares has been entered into the books and records of the Company or a duly authorized
transfer agent of the Company, no right to vote, receive dividends or any other right as a stockholder will exist with respect to such Shares. In the case of Restricted Shares, the Company shall cause such certificates to be deposited in escrow
under Section 7(c). In the case of other Shares, the Company shall cause such certificates to be delivered to or upon the order of the person exercising this option. 

SECTION 5. PAYMENT FOR STOCK. 
 (a)
Cash. All or part of the Purchase Price may be paid in cash or cash equivalents. 

  
 2 

 (b) Surrender of Stock. At the discretion of the Board of Directors, all or any part
of the Purchase Price may be paid by surrendering, or attesting to the ownership of, Shares that are already owned by the Optionee. Such Shares shall be surrendered to the Company in good form for transfer and shall be valued at their Fair Market
Value as of the date when this option is exercised. 
 (c) Exercise/Sale. All or part of the Purchase Price and any withholding taxes
may be paid by the delivery (on a form prescribed by the Company) of an irrevocable direction to a securities broker approved by the Company to sell Shares and to deliver all or part of the sales proceeds to the Company. However, payment pursuant to
this Subsection (c) shall be permitted only if (i) Stock then is publicly traded and (ii) such payment does not violate applicable law. 

SECTION 6. TERM AND EXPIRATION. 
 (a)
Basic Term. This option shall in any event expire on the expiration date set forth in the Notice of Stock Option Grant, which date is 10 years after the Date of Grant (five years after the Date of Grant if this option is designated as an ISO
in the Notice of Stock Option Grant and Section 3(b) of the Plan applies). 
 (b) Termination of Service (Except by Death). If
the Optionee’s Service terminates for any reason other than death, then this option shall expire on the earliest of the following occasions: 

(i) The expiration date determined pursuant to Subsection (a) above; 

(ii) The date three months after the termination of the Optionee’s Service for any reason other than Disability; or 

(iii) The date six months after the termination of the Optionee’s Service by reason of Disability. 

The Optionee may exercise all or part of this option at any time before its expiration under the preceding sentence, but only to the extent that this option
is exercisable for vested Shares on or before the date when the Optionee’s Service terminates. When the Optionee’s Service terminates, this option shall expire immediately with respect to the number of Shares for which this option is not
yet exercisable and with respect to any Restricted Shares. In the event that the Optionee dies after termination of Service but before the expiration of this option, all or part of this option may be exercised (prior to expiration) by the executors
or administrators of the Optionee’s estate or by any person who has acquired this option directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that this option was exercisable for vested Shares on
or before the date when the Optionee’s Service terminated. Once this option (or portion thereof) has terminated, the Optionee shall have no further rights with respect to the option (or portion thereof) or to the underlying Shares. 

  
 3 

 (c) Death of the Optionee. If the Optionee dies while in Service, then this option
shall expire on the earlier of the following dates: 
 (i) The expiration date determined pursuant to Subsection (a)
above; or 
 (ii) The date 12 months after the Optionee’s death. 

All or part of this option may be exercised at any time before its expiration under the preceding sentence by the executors or administrators of the
Optionee’s estate or by any person who has acquired this option directly from the Optionee by beneficiary designation, bequest or inheritance, but only to the extent that this option is exercisable for vested Shares on or before the date of the
Optionee’s death. When the Optionee dies, this option shall expire immediately with respect to the number of Shares for which this option is not yet exercisable and with respect to any Restricted Shares. Once this option (or portion thereof)
has terminated, the Optionee shall have no further rights with respect to the option (or portion thereof) or to the underlying Shares. 

(d) Extension of Post-Termination Exercise Periods. Following the date on which the Company’s Stock is first listed for trading on
an established securities market, if during any part of the exercise period described in Subsections (b)(ii) or (iii) or Subsection (c)(ii) above the exercise of this option would be prohibited solely because the issuance of Shares upon such
exercise would violate the registration requirements under the Securities Act or a similar provision of other applicable law, then instead of terminating at the end of such prescribed period, the then-vested portion of this option will instead
remain outstanding and not expire until the earlier of (i) the expiration date determined pursuant to Section 6(a) above or (ii) the date on which the then-vested portion of this option has been exercisable without violation of
applicable law for the aggregate period (which need not be consecutive) after termination of the Optionee’s Service specified in the applicable Subsection above. 

(e) Part-Time Employment and Leaves of Absence. If the Optionee commences working on a part-time basis, then the Company may adjust the
vesting schedule set forth in the Notice of Stock Option Grant. If the Optionee goes on a leave of absence, then the Company may adjust the vesting schedule set forth in the Notice of Stock Option Grant in accordance with the Company’s leave of
absence policy or the terms of such leave. Except as provided in the preceding sentence, Service shall be deemed to continue for any purpose under this Agreement while the Optionee is on a bona fide leave of absence, if (i) such leave
was approved by the Company in writing and (ii) continued crediting of Service for such purpose is expressly required by the terms of such leave or by applicable law (as determined by the Company). Service shall be deemed to terminate when such
leave ends, unless the Optionee immediately returns to active work. 
 (f) Notice Concerning ISO Treatment. Even if this option is
designated as an ISO in the Notice of Stock Option Grant, it ceases to qualify for favorable tax treatment as an ISO to the extent that it is exercised: 

(i) More than three months after the date when the Optionee ceases to be an Employee for any reason other than death or
permanent and total disability (as defined in Section 22(e)(3) of the Code); 

  
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 (ii) More than 12 months after the date when the Optionee ceases to be an
Employee by reason of permanent and total disability (as defined in Section 22(e)(3) of the Code); or 
 (iii) More than
three months after the date when the Optionee has been on a leave of absence for three months, unless the Optionee’s reemployment rights following such leave were guaranteed by statute or by contract. 

SECTION 7. RIGHT OF REPURCHASE. 
 (a)
Scope of Repurchase Right. Until they vest in accordance with the Notice of Stock Option Grant and Subsection (b) below, the Shares acquired under this Agreement shall be Restricted Shares and shall be subject to the Company’s Right
of Repurchase. The Company, however, may decline to exercise its Right of Repurchase or may exercise its Right of Repurchase only with respect to a portion of the Restricted Shares. The Company may exercise its Right of Repurchase only during the
Repurchase Period following the termination of the Optionee’s Service, but the Right of Repurchase may be exercised automatically under Subsection (d) below. If the Right of Repurchase is exercised, the Company shall pay the Optionee an
amount equal to the lower of (i) the Exercise Price of each Restricted Share being repurchased or (ii) the Fair Market Value of such Restricted Share at the time the Right of Repurchase is exercised. 

(b) Lapse of Repurchase Right. The Right of Repurchase shall lapse with respect to the Restricted Shares in accordance with the vesting
schedule set forth in the Notice of Stock Option Grant. 
 (c) Escrow. Upon issuance, the certificate(s) for Restricted Shares shall
be deposited in escrow with the Company to be held in accordance with the provisions of this Agreement. Any additional or exchanged securities or other property described in Subsection (f) below shall immediately be delivered to the Company to
be held in escrow. All ordinary cash dividends on Restricted Shares (or on other securities held in escrow) shall be paid directly to the Optionee and shall not be held in escrow. Restricted Shares, together with any other assets held in escrow
under this Agreement, shall be (i) surrendered to the Company for repurchase upon exercise of the Right of Repurchase or the Right of First Refusal or (ii) released to the Optionee upon his or her request to the extent that the Shares have
ceased to be Restricted Shares (but not more frequently than once every six months). In any event, all Shares that have ceased to be Restricted Shares, together with any other vested assets held in escrow under this Agreement, shall be released
within 90 days after the earlier of (i) the termination of the Optionee’s Service or (ii) the lapse of the Right of First Refusal. 

(d) Exercise of Repurchase Right. The Company shall be deemed to have exercised its Right of Repurchase automatically for all
Restricted Shares as of the commencement of the Repurchase Period, unless the Company during the Repurchase Period notifies the holder of the Restricted Shares pursuant to Section 13(c) that it will not exercise its Right of Repurchase for some
or all of the Restricted Shares. The Company shall pay to the holder of the Restricted Shares the purchase price determined under Subsection (a) above for the Restricted Shares being repurchased. Payment shall be made in cash or cash
equivalents and/or by canceling indebtedness to the Company incurred by the Optionee in the purchase of the Restricted Shares. The certificate(s) representing the Restricted Shares being repurchased shall be delivered to the Company. 

  
 5 

 (e) Termination of Rights as Stockholder. If the Right of Repurchase is exercised in
accordance with this Section 7 and the Company makes available the consideration for the Restricted Shares being repurchased, then the person from whom the Restricted Shares are repurchased shall no longer have any rights as a holder of the
Restricted Shares (other than the right to receive payment of such consideration). Such Restricted Shares shall be deemed to have been repurchased pursuant to this Section 7, whether or not the certificate(s) for such Restricted Shares have
been delivered to the Company or the consideration for such Restricted Shares has been accepted. 
 (f) Additional or Exchanged
Securities and Property. In the event of a merger or consolidation of the Company, a sale of all or substantially all of the Company’s stock or assets, any other corporate reorganization, a stock split, the declaration of a stock dividend,
the declaration of an extraordinary dividend payable in a form other than stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s
outstanding securities, any securities or other property (including cash or cash equivalents) that are by reason of such transaction exchanged for, or distributed with respect to, any Restricted Shares shall immediately be subject to the Right of
Repurchase. Appropriate adjustments to reflect the exchange or distribution of such securities or property shall be made to the number and/or class of the Restricted Shares. Appropriate adjustments shall also be made to the price per share to be
paid upon the exercise of the Right of Repurchase, provided that the aggregate purchase price payable for the Restricted Shares shall remain the same. In the event of any transaction described in Section 8(b) of the Plan or any other corporate
reorganization, the Right of Repurchase may be exercised by the Company’s successor. 
 (g) Transfer of Restricted Shares. The
Optionee shall not transfer, assign, encumber or otherwise dispose of any Restricted Shares without the Company’s written consent, except as provided in the following sentence. The Optionee may transfer Restricted Shares to one or more members
of the Optionee’s Immediate Family or to a trust established by the Optionee for the benefit of the Optionee and/or one or more members of the Optionee’s Immediate Family, provided in either case that the Transferee agrees in writing on a
form prescribed by the Company to be bound by all provisions of this Agreement. If the Optionee transfers any Restricted Shares, then this Agreement shall apply to the Transferee to the same extent as to the Optionee. 

(h) Assignment of Repurchase Right. The Board of Directors may freely assign the Company’s Right of Repurchase, in whole or in
part. Any person who accepts an assignment of the Right of Repurchase from the Company shall assume all of the Company’s rights and obligations under this Section 7. 

  
 6 

 SECTION 8. RIGHT OF FIRST REFUSAL. 

(a) Right of First Refusal. In the event that the Optionee proposes to sell, pledge or otherwise transfer to a third party any Shares
acquired under this Agreement, or any interest in such Shares, the Company shall have the Right of First Refusal with respect to all (and not less than all) of such Shares. If the Optionee desires to transfer Shares acquired under this Agreement,
the Optionee shall give a written Transfer Notice to the Company describing fully the proposed transfer, including the number of Shares proposed to be transferred, the proposed transfer price, the name and address of the proposed Transferee and
proof satisfactory to the Company that the proposed sale or transfer will not violate any applicable federal, State or foreign securities laws. The Transfer Notice shall be signed both by the Optionee and by the proposed Transferee and must
constitute a binding commitment of both parties to the transfer of the Shares. The Company shall have the right to purchase all, and not less than all, of the Shares on the terms of the proposal described in the Transfer Notice (subject, however, to
any change in such terms permitted under Subsection (b) below) by delivery of a notice of exercise of the Right of First Refusal within 30 days after the date when the Transfer Notice was received by the Company. 

(b) Transfer of Shares. If the Company fails to exercise its Right of First Refusal within 30 days after the date when it received
the Transfer Notice, the Optionee may, not later than 90 days following receipt of the Transfer Notice by the Company, conclude a transfer of the Shares subject to the Transfer Notice on the terms and conditions described in the Transfer
Notice, provided that any such sale is made in compliance with applicable federal, State and foreign securities laws and not in violation of any other contractual restrictions to which the Optionee is bound. Any proposed transfer on terms and
conditions different from those described in the Transfer Notice, as well as any subsequent proposed transfer by the Optionee, shall again be subject to the Right of First Refusal and shall require compliance with the procedure described in
Subsection (a) above. If the Company exercises its Right of First Refusal, the parties shall consummate the sale of the Shares on the terms set forth in the Transfer Notice within 60 days after the date when the Company received the
Transfer Notice (or within such longer period as may have been specified in the Transfer Notice); provided, however, that in the event the Transfer Notice provided that payment for the Shares was to be made in a form other than cash or cash
equivalents paid at the time of transfer, the Company shall have the option of paying for the Shares with cash or cash equivalents equal to the present value of the consideration described in the Transfer Notice. 

(c) Additional or Exchanged Securities and Property. In the event of a merger or consolidation of the Company, a sale of all or
substantially all of the Company’s stock or assets, any other corporate reorganization, a stock split, the declaration of a stock dividend, the declaration of an extraordinary dividend payable in a form other than stock, a spin-off, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities, any securities or other property (including cash or cash equivalents)
that are by reason of such transaction exchanged for, or distributed with respect to, any Shares subject to this Section 8 shall immediately be subject to the Right of First Refusal. Appropriate adjustments to reflect the exchange or
distribution of such securities or property shall be made to the number and/or class of the Shares subject to this Section 8. 

  
 7 

 (d) Termination of Right of First Refusal. Any other provision of this Section 8
notwithstanding, in the event that the Stock is readily tradable on an established securities market when the Optionee desires to transfer Shares, the Company shall have no Right of First Refusal, and the Optionee shall have no obligation to comply
with the procedures prescribed by Subsections (a) and (b) above. 
 (e) Permitted Transfers. This Section 8 shall not
apply to (i) a transfer by beneficiary designation, will or intestate succession or (ii) a transfer to one or more members of the Optionee’s Immediate Family or to a trust established by the Optionee for the benefit of the Optionee
and/or one or more members of the Optionee’s Immediate Family, provided in either case that the Transferee agrees in writing on a form prescribed by the Company to be bound by all provisions of this Agreement. If the Optionee transfers any
Shares acquired under this Agreement, either under this Subsection (e) or after the Company has failed to exercise the Right of First Refusal, then this Agreement shall apply to the Transferee to the same extent as to the Optionee. 

(f) Termination of Rights as Stockholder. If the Company makes available, at the time and place and in the amount and form provided in
this Agreement, the consideration for the Shares to be purchased in accordance with this Section 8, then after such time the person from whom such Shares are to be purchased shall no longer have any rights as a holder of such Shares (other than
the right to receive payment of such consideration in accordance with this Agreement). Such Shares shall be deemed to have been purchased in accordance with the applicable provisions hereof, whether or not the certificate(s) therefor have been
delivered as required by this Agreement. 
 (g) Assignment of Right of First Refusal. The Board of Directors may freely assign the
Company’s Right of First Refusal, in whole or in part. Any person who accepts an assignment of the Right of First Refusal from the Company shall assume all of the Company’s rights and obligations under this Section 8. 

SECTION 9. LEGALITY OF INITIAL ISSUANCE. 

No Shares shall be issued upon the exercise of this option unless and until the Company has determined that: 

(a) It and the Optionee have taken any actions required to register the Shares under the Securities Act or to perfect an
exemption from the registration requirements thereof; 
 (b) Any applicable listing requirement of any stock exchange or
other securities market on which Stock is listed has been satisfied; and 
 (c) Any other applicable provision of federal,
State or foreign law has been satisfied. 

  
 8 

 SECTION 10. NO REGISTRATION RIGHTS. 

The Company may, but shall not be obligated to, register or qualify the sale of Shares under the Securities Act or any other applicable law.
The Company shall not be obligated to take any affirmative action in order to cause the sale of Shares under this Agreement to comply with any law. 

SECTION 11. RESTRICTIONS ON TRANSFER OF SHARES. 

(a) Securities Law Restrictions. Regardless of whether the offer and sale of Shares under the Plan have been registered under the
Securities Act or have been registered or qualified under the securities laws of any State or other relevant jurisdiction, the Company at its discretion may impose restrictions upon the sale, pledge or other transfer of such Shares (including the
placement of appropriate legends on the stock certificates (or electronic equivalent) or the imposition of stop-transfer instructions) and may refuse (or may be required to refuse) to transfer Shares acquired hereunder (or Shares proposed to be
transferred in a subsequent transfer) if, in the judgment of the Company, such restrictions, legends or refusal are necessary or appropriate to achieve compliance with the Securities Act or other relevant securities or other laws, including without
limitation under Regulation S of the Securities Act or pursuant to another available exemption from registration.
 (b) Market Stand-Off. In connection with any underwritten public offering by the Company of its equity securities pursuant to an effective registration statement filed under the Securities Act, including the Company’s
initial public offering, the Optionee or a Transferee shall not directly or indirectly sell, make any short sale of, loan, hypothecate, pledge, offer, grant or sell any option or other contract for the purchase of, purchase any option or other
contract for the sale of, or otherwise dispose of or transfer, or agree to engage in any of the foregoing transactions with respect to, any Shares acquired under this Agreement without the prior written consent of the Company or its managing
underwriter. Such restriction (the “Market Stand-Off”) shall be in effect for such period of time following the date of the final prospectus for the offering as may be requested by the Company or
such underwriter. In no event, however, shall such period exceed 180 days plus such additional period as may reasonably be requested by the Company or such underwriter to accommodate regulatory restrictions on (i) the publication or other
distribution of research reports or (ii) analyst recommendations and opinions, including (without limitation) the restrictions set forth in Rule 2711(f)(4) of the National Association of Securities Dealers and Rule 472(f)(4) of the
New York Stock Exchange, as amended, or any similar successor rules. The Market Stand-Off shall in any event terminate two years after the date of the Company’s initial public offering. In the event of
the declaration of a stock dividend, a spin-off, a stock split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting the Company’s outstanding securities without
receipt of consideration, any new, substituted or additional securities which are by reason of such transaction distributed with respect to any Shares subject to the Market Stand-Off, or into which such Shares
thereby become convertible, shall immediately be subject to the Market Stand-Off. In order to enforce the Market Stand-Off, the Company may impose stop-transfer
instructions with respect to the Shares acquired under this Agreement until the end of the applicable stand-off period. The Company’s underwriters shall be beneficiaries of the agreement set forth in this
Subsection (b). This Subsection (b) shall not apply to Shares registered in the public offering under the Securities Act. 

  
 9 

 (c) Investment Intent at Grant. The Optionee represents and agrees that the Shares to
be acquired upon exercising this option will be acquired for investment, and not with a view to the sale or distribution thereof. 
 (d)
Investment Intent at Exercise. In the event that the sale of Shares under the Plan is not registered under the Securities Act but an exemption is available that requires an investment representation or other representation, the Optionee shall
represent and agree at the time of exercise that the Shares being acquired upon exercising this option are being acquired for investment, and not with a view to the sale or distribution thereof, and shall make such other representations as are
deemed necessary or appropriate by the Company and its counsel, including (if applicable because the Company is relying on Regulation S under the Securities Act) that as of the date of exercise the Optionee is (i) not a U.S. Person;
(ii) not acquiring the Shares on behalf, or for the account or benefit, of a U.S. Person; and (iii) is not exercising the option in the United States. 

(e) Legends. All certificates evidencing Shares purchased under this Agreement shall bear the following legend: 

“THE SHARES REPRESENTED HEREBY MAY NOT BE SOLD, ASSIGNED, TRANSFERRED, ENCUMBERED OR IN ANY MANNER DISPOSED OF, EXCEPT IN COMPLIANCE WITH
THE TERMS OF A WRITTEN AGREEMENT BETWEEN THE COMPANY AND THE REGISTERED HOLDER OF THE SHARES (OR THE PREDECESSOR IN INTEREST TO THE SHARES). SUCH AGREEMENT GRANTS TO THE COMPANY CERTAIN RIGHTS OF FIRST REFUSAL UPON AN ATTEMPTED TRANSFER OF THE
SHARES AND CERTAIN REPURCHASE RIGHTS UPON TERMINATION OF SERVICE WITH THE COMPANY. IN ADDITION, THE SHARES ARE SUBJECT TO RESTRICTIONS ON TRANSFER FOR A LIMITED PERIOD FOLLOWING THE EFFECTIVE DATE OF THE UNDERWRITTEN PUBLIC OFFERING OF THE
COMPANY’S SECURITIES AND MAY NOT BE SOLD OR OTHERWISE DISPOSED OF BY THE HOLDER WITHOUT THE CONSENT OF THE COMPANY OR THE MANAGING UNDERWRITER. THE SECRETARY OF THE COMPANY WILL UPON WRITTEN REQUEST FURNISH A COPY OF SUCH AGREEMENT TO THE
HOLDER HEREOF WITHOUT CHARGE.” 
 All certificates evidencing Shares purchased under this Agreement in an unregistered transaction shall bear the
following legend (and such other restrictive legends as are required or deemed advisable under the provisions of any applicable law): 

“THE SHARES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “ACT”) OR ANY
SECURITIES LAWS OF ANY U.S. STATE, AND MAY NOT BE SOLD, REOFFERED, PLEDGED, ASSIGNED, ENCUMBERED OR OTHERWISE TRANSFERRED OR DISPOSED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT OR AN OPINION OF COUNSEL, SATISFACTORY TO THE COMPANY AND
ITS COUNSEL, 

  
 10 

 THAT SUCH REGISTRATION IS NOT REQUIRED. IN THE ABSENCE OF REGISTRATION OR THE AVAILABILITY
(CONFIRMED BY OPINION OF COUNSEL) OF AN ALTERNATIVE EXEMPTION FROM REGISTRATION UNDER THE ACT (INCLUDING WITHOUT LIMITATION IN ACCORDANCE WITH REGULATION S UNDER THE ACT), THESE SHARES MAY NOT BE SOLD, REOFFERED, PLEDGED, ASSIGNED, ENCUMBERED OR
OTHERWISE TRANSFERRED OR DISPOSED OF. HEDGING TRANSACTIONS INVOLVING THESE SHARES MAY NOT BE CONDUCTED UNLESS IN COMPLIANCE WITH THE ACT.” 

(f) Removal of Legends. If, in the opinion of the Company and its counsel, any legend placed on a stock certificate representing Shares
sold under this Agreement is no longer required, the holder of such certificate shall be entitled to exchange such certificate for a certificate representing the same number of Shares but without such legend. 

(g) Administration. Any determination by the Company and its counsel in connection with any of the matters set forth in this
Section 11 shall be conclusive and binding on the Optionee and all other persons. 
 SECTION 12. ADJUSTMENT OF SHARES. 

In the event of any transaction described in Section 8(a) of the Plan, the terms of this option (including, without limitation, the number
and kind of Shares subject to this option and the Exercise Price) shall be adjusted as set forth in Section 8(a) of the Plan. In the event that the Company is a party to a merger or consolidation or in the event of a sale of all or
substantially all of the Company’s stock or assets, this option shall be subject to the treatment provided by the Board of Directors in its sole discretion, as provided in Section 8(b) of the Plan. 

SECTION 13. MISCELLANEOUS PROVISIONS. 

(a) Rights as a Stockholder. Neither the Optionee nor the Optionee’s representative shall have any rights as a stockholder with
respect to any Shares subject to this option until the Optionee or the Optionee’s representative becomes entitled to receive such Shares by filing a notice of exercise and paying the Purchase Price pursuant to Sections 4 and 5. 

(b) No Retention Rights. Nothing in this option or in the Plan shall confer upon the Optionee any right to continue in Service for any
period of specific duration or interfere with or otherwise restrict in any way the rights of the Company (or any Parent or Subsidiary employing or retaining the Optionee) or of the Optionee, which rights are hereby expressly reserved by each, to
terminate his or her Service at any time and for any reason, with or without cause. 
 (c) Notice. Any notice required by the terms
of this Agreement shall be given in writing. It shall be deemed effective upon (i) personal delivery, (ii) deposit with the United States Postal Service, by registered or certified mail, with postage and fees prepaid, (iii) deposit
with Federal Express Corporation, with shipping charges prepaid or (iv) deposit with any internationally recognized express mail courier service. Notice shall be addressed to the Company at its principal executive office and to the Optionee at
the address that he or she most recently provided to the Company in accordance with this Subsection (c). 

  
 11 

 (d) Modifications and Waivers. No provision of this Agreement shall be modified,
waived or discharged unless the modification, waiver or discharge is agreed to in writing and signed by the Optionee and by an authorized officer of the Company (other than the Optionee). No waiver by either party of any breach of, or of compliance
with, any condition or provision of this Agreement by the other party shall be considered a waiver of any other condition or provision or of the same condition or provision at another time. 

(e) Entire Agreement. The Notice of Stock Option Grant, this Agreement and the Plan constitute the entire contract between the parties
hereto with regard to the subject matter hereof. They supersede any other agreements, representations or understandings (whether oral or written and whether express or implied) that relate to the subject matter hereof. 

(f) Choice of Law. This Agreement shall be governed by, and construed in accordance with, the laws of the State of Delaware, as such
laws are applied to contracts entered into and performed in such State. 
 SECTION 14. ACKNOWLEDGEMENTS OF THE OPTIONEE. 

In addition to the other terms, conditions and restrictions imposed on this option and the Shares issuable under this option pursuant to this
Agreement and the Plan, the Optionee expressly acknowledges being subject to Sections 7 (Right of Repurchase), 8 (Right of First Refusal), 9 (Legality of Initial Issuance) and 11 (Restrictions on Transfer of Shares, including without limitation the
Market Stand-Off), as well as the following provisions: 
 (a) Tax Consequences. The Optionee
agrees that the Company does not have a duty to design or administer the Plan or its other compensation programs in a manner that minimizes the Optionee’s tax liabilities. The Optionee shall not make any claim against the Company or its Board
of Directors, officers or employees related to tax liabilities arising from this option or the Optionee’s other compensation. In particular, any Optionee subject to U.S. taxation acknowledges that this option is exempt from Section 409A of
the Code only if the Exercise Price is at least equal to the Fair Market Value per Share on the Date of Grant. Since Shares are not traded on an established securities market, the determination of their Fair Market Value is made by the Board of
Directors or by an independent valuation firm retained by the Company. The Optionee acknowledges that there is no guarantee in either case that the Internal Revenue Service will agree with the valuation, and the Optionee shall not make any claim
against the Company or its Board of Directors, officers or employees in the event that the Internal Revenue Service asserts that the valuation was too low. 

(b) Electronic Delivery of Documents. The Optionee agrees to accept by email all documents relating to the Company, the Plan or this
option and all other documents that the Company is required to deliver to its security holders (including, without limitation, disclosures that may be required by the Securities and Exchange Commission). The Optionee also agrees that the Company may
deliver these documents by posting them on a website maintained by the Company or by a third party under contract with the Company. If the 

  
 12 

 
Company posts these documents on a website, it shall notify the Optionee by email of their availability. The Optionee acknowledges that he or she may incur costs in connection with electronic
delivery, including the cost of accessing the internet and printing fees, and that an interruption of internet access may interfere with his or her ability to access the documents. This consent shall remain in effect until this option expires or
until the Optionee gives the Company written notice that it should deliver paper documents. 
 (c) No Notice of Expiration Date. The
Optionee agrees that the Company and its officers, employees, attorneys and agents do not have any obligation to notify him or her prior to the expiration of this option pursuant to Section 6, regardless of whether this option will expire at
the end of its full term or on an earlier date related to the termination of the Optionee’s Service. The Optionee further agrees that he or she has the sole responsibility for monitoring the expiration of this option and for exercising this
option, if at all, before it expires. This Subsection (c) shall supersede any contrary representation that may have been made, orally or in writing, by the Company or by an officer, employee, attorney or agent of the Company. 

(d) Waiver of Statutory Information Rights. The Optionee acknowledges and agrees that, upon exercise of this option and until the first
sale of the Company’s Stock to the general public pursuant to a registration statement filed under the Securities Act, he or she will be deemed to have waived any rights the Optionee might otherwise have had under Section 220 of the
Delaware General Corporation Law (or under similar rights under other applicable law) to inspect for any proper purpose and to make copies and extracts from the Company’s stock ledger, a list of its stockholders and its other books and records
or the books and records of any subsidiary. This waiver applies only in the Optionee’s capacity as a stockholder and does not affect any other inspection rights the Optionee may have under other law or pursuant to a written agreement with the
Company. 
 (e) Plan Discretionary. The Optionee understands and acknowledges that (i) the Plan is entirely discretionary,
(ii) the Company and the Optionee’s employer have reserved the right to amend, suspend or terminate the Plan at any time, (iii) the grant of an option does not in any way create any contractual or other right to receive
additional grants of options (or benefits in lieu of options) at any time or in any amount and (iv) all determinations with respect to any additional grants, including (without limitation) the times when options will be granted, the number of
Shares offered, the Exercise Price and the vesting schedule, will be at the sole discretion of the Company. 
 (f) Termination of
Service. The Optionee understands and acknowledges that participation in the Plan ceases upon termination of his or her Service for any reason, except as may explicitly be provided otherwise in the Plan or this Agreement. 

(g) Extraordinary Compensation. The value of this option shall be an extraordinary item of compensation outside the scope of the
Optionee’s employment contract, if any, and shall not be considered a part of his or her normal or expected compensation for purposes of calculating severance, resignation, redundancy or end-of-service payments, bonuses, long-service awards, pension or retirement benefits or similar payments. 

  
 13 

 (h) Authorization to Disclose. The Optionee hereby authorizes and directs the
Optionee’s employer to disclose to the Company or any Subsidiary any information regarding the Optionee’s employment, the nature and amount of the Optionee’s compensation and the fact and conditions of the Optionee’s
participation in the Plan, as the Optionee’s employer deems necessary or appropriate to facilitate the administration of the Plan. 

(i) Personal Data Authorization. The Optionee consents to the collection, use and transfer of personal data as described in this
Subsection (i). The Optionee understands and acknowledges that the Company, the Optionee’s employer and the Company’s other Subsidiaries hold certain personal information regarding the Optionee for the purpose of managing and
administering the Plan, including (without limitation) the Optionee’s name, home address, telephone number, date of birth, social insurance number, salary, nationality, job title, any Shares or directorships held in the Company and details of
all options or any other entitlements to Shares awarded, canceled, exercised, vested, unvested or outstanding in the Optionee’s favor (the “Data”). The Optionee further understands and acknowledges that the Company and/or its
Subsidiaries will transfer Data among themselves as necessary for the purpose of implementation, administration and management of the Optionee’s participation in the Plan and that the Company and/or any Subsidiary may each further transfer Data
to any third party assisting the Company in the implementation, administration and management of the Plan. The Optionee understands and acknowledges that the recipients of Data may be located in the United States or elsewhere. The Optionee
authorizes such recipients to receive, possess, use, retain and transfer Data, in electronic or other form, for the purpose of administering the Optionee’s participation in the Plan, including a transfer to any broker or other third party with
whom the Optionee elects to deposit Shares acquired under the Plan of such Data as may be required for the administration of the Plan and/or the subsequent holding of Shares on the Optionee’s behalf. The Optionee may, at any time, view the
Data, require any necessary modifications of Data or withdraw the consents set forth in this Subsection (i) by contacting the Company in writing. 

SECTION 15. DEFINITIONS. 
 (a)
“Agreement” shall mean this Stock Option Agreement. 
 (b) “Board of Directors” shall mean the Board of
Directors of the Company, as constituted from time to time or, if a Committee has been appointed, such Committee. 
 (c)
“Company” shall mean RAPT Therapeutics, Inc., a Delaware corporation. 
 (d) “Immediate Family” shall mean
any child, stepchild, grandchild, parent, stepparent, grandparent, spouse, sibling, mother-in-law,
father-in-law, son-in-law, daughter-in-law, brother-in-law or sister-in-law
and shall include adoptive relationships. 
 (e) “Optionee” shall mean the person named in the Notice of Stock Option
Grant. 
 (f) “Plan” shall mean the RAPT Therapeutics, Inc. 2015 Stock Plan, as in effect on the Date of Grant. 

  
 14 

 (g) “Purchase Price” shall mean the Exercise Price multiplied by the number
of Shares with respect to which this option is being exercised. 
 (h) “Repurchase Period” shall mean a period of 90
consecutive days commencing on the date when the Optionee’s Service terminates for any reason, including (without limitation) death or disability. 

(i) “Restricted Share” shall mean a Share that is subject to the Right of Repurchase. 

(j) “Right of First Refusal” shall mean the Company’s right of first refusal described in Section 8. 

(k) “Right of Repurchase” shall mean the Company’s right of repurchase described in Section 7. 

(l) “Service” means service as an Employee, Outside Director or Consultant. 

(m) “Transferee” shall mean any person to whom the Optionee has directly or indirectly transferred any Share acquired under
this Agreement. 
 (n) “Transfer Notice” shall mean the notice of a proposed transfer of Shares described in
Section 8. 
 (o) “U.S. Person” shall mean a person described in Rule 902(k) of Regulation S of the Securities Act (or
any successor rule or provision), which generally defines a U.S. person as any natural person resident in the United States, any estate of which any executor or administrator is a U.S. Person, or any trust of which of any trustee is a U.S. Person.

  
 15 

 RAPT THERAPEUTICS, INC. 2015 STOCK
PLAN 
 NOTICE OF STOCK OPTION EXERCISE
(EARLY EXERCISE) 
 You must sign this Notice on Page 3 before submitting it to the Company.

 OPTIONEE INFORMATION: 
  

							
	Name:	 	 	  	Social Security Number:	  	 
	Address:	 	 	  	Employee Number:	  	 
		 	 	  		  	

 OPTION INFORMATION: 

 

			
	Date of Grant: _____________ ___, 20__	  	Type of Stock Option:
		
	Exercise Price per Share: $________	  	☐ Nonstatutory (NSO)
		
	Total number of shares of Common Stock of RAPT Therapeutics, Inc. (the “Company”) covered by the option: __________________	  	☐ Incentive (ISO)

 EXERCISE INFORMATION: 

Number of shares of Common Stock of the Company for which the option is being exercised now: ________________. (These shares are referred to below as the
“Purchased Shares.”) 
 Total Exercise Price for the Purchased Shares: $____________ 

Form of payment enclosed [check all that apply]: 
  

	☐	 Check for $____________, payable to “RAPT Therapeutics, Inc.” 

 

	☐	 Certificate(s) for ________________ shares of Common Stock of the Company. These shares will be valued as of
the date this notice is received by the Company. [Requires Company consent.] 

  

	☐	 Attestation Form covering ________________ shares of Common Stock of the Company. These shares will be valued
as of the date this notice is received by the Company. [Requires Company consent.] 

 Name(s) in which the Purchased Shares
should be registered [please review the attached explanation of the available forms of ownership, and then check one box]: 
  

			
		
	 ☐   In my name only
	  	
		
	 ☐   In the names of my spouse and myself as community property
	  	My spouse’s name (if applicable):
		
	 ☐   In the names of my spouse and myself as community property with the
right of survivorship
	  	                                      
                                         
                                 

					
			
	 ☐   In the names of my spouse and myself as joint tenants with the right
of survivorship
	  		  	
			
	 ☐   In the name of an eligible revocable trust [requires Stock
Transfer Agreement]
	  		  	Full legal name of revocable trust: 

			
		  		  	 
			
		  		  	 
			
		  		  	 
		
	The certificate for the Purchased Shares should be sent to the following address:	  	 
	  	 
	  	 
	  	 

 REPRESENTATIONS AND ACKNOWLEDGEMENTS OF THE
OPTIONEE: 
  

	1.	 I represent and warrant to the Company that I am acquiring and will hold the Purchased Shares for investment
for my account only, and not with a view to, or for resale in connection with, any “distribution” of the Purchased Shares within the meaning of the Securities Act of 1933, as amended (the “Securities Act”). 

 

	2.	 I understand that my purchase of the Purchased Shares has not been registered under the Securities Act by
reason of a specific exemption therefrom and that the Purchased Shares must be held indefinitely, unless they are subsequently registered under the Securities Act or I obtain an opinion of counsel (in form and substance satisfactory to the Company
and its counsel) that registration is not required. 

  

	3.	 I acknowledge that the Company is under no obligation to register the Purchased Shares or any sale or transfer
thereof. 

  

	4.	 I am aware of Rule 144 under the Securities Act, which permits limited public resales of securities acquired in
a non-public offering, subject to the satisfaction of certain conditions. These conditions may include (without limitation) that certain current public information about the issuer be available, that the
resale occur only after a holding period required by Rule 144 has been satisfied, that the sale occur through an unsolicited “broker’s transaction” and that the amount of securities being sold during any three-month period not exceed
specified limitations. I understand that the conditions for resale set forth in Rule 144 have not been satisfied as of the date set forth below and that the Company is not required to take action to satisfy any conditions applicable to it.

  

	5.	 I will not sell, transfer or otherwise dispose of the Purchased Shares in violation of the Securities Act, the
Securities Exchange Act of 1934, or the rules promulgated thereunder, including Rule 144 under the Securities Act. 

  

	6.	 I acknowledge that I have received and had access to such information as I consider necessary or appropriate
for deciding whether to invest in the Purchased Shares and that I had an opportunity to ask questions and receive answers from the Company regarding the terms and conditions of the issuance of the Purchased Shares. 

 

	7.	 I am aware that my investment in the Company is a speculative investment that has limited liquidity and is
subject to the risk of complete loss. I am able, without impairing my financial condition, to hold the Purchased Shares for an indefinite period and to suffer a complete loss of my investment in the Purchased Shares. 

  
 2 

	8.	 I acknowledge that the Purchased Shares remain subject to the Company’s right of first refusal and the
market stand-off (sometimes referred to as the “lock-up”) and may remain subject to the Company’s right of repurchase, all in accordance with the
applicable Notice of Stock Option Grant and Stock Option Agreement. 

  

	9.	 I acknowledge that I am acquiring the Purchased Shares subject to all other terms of the Notice of Stock Option
Grant and Stock Option Agreement. 

  

	10.	 I acknowledge that I have received a copy of the Company’s explanation of the forms of ownership available
for my Purchased Shares. I acknowledge that the Company has encouraged me to consult my own adviser to determine the form of ownership that is appropriate for me. In the event that I choose to transfer my Purchased Shares to a trust, I agree to sign
a Stock Transfer Agreement. In the event that I choose to transfer my Purchased Shares to a trust that does not satisfy the requirements described in the attached explanation (i.e., a trust that is not an eligible revocable trust), I also
acknowledge that the transfer will be treated as a “disposition” for tax purposes. As a result, the favorable ISO tax treatment will be unavailable and other unfavorable tax consequences may occur. 

 

	11.	 I acknowledge that I have received a copy of the Company’s explanation of the federal income tax
consequences of an option exercise and the tax election under section 83(b) of the Internal Revenue Code. In the event that I choose to make a section 83(b) election, I acknowledge that it is my responsibility—and not the Company’s
responsibility—to file the election in a timely manner, even if I ask the Company or its agents to make the filing on my behalf. I acknowledge that the Company has encouraged me to consult my own adviser to determine the tax consequences of
acquiring the Purchased Shares at this time. 

  

	12.	 I agree that the Company does not have a duty to design or administer the 2015 Stock Plan or its other
compensation programs in a manner that minimizes my tax liabilities. I will not make any claim against the Company or its Board of Directors, officers or employees related to tax liabilities arising from my options or my other compensation. In
particular, I acknowledge that my options are exempt from section 409A of the Internal Revenue Code only if the exercise price per share is at least equal to the fair market value per share of the Company’s Common Stock at the time the option
was granted by the Company’s Board of Directors. Since shares of the Company’s Common Stock are not traded on an established securities market, the determination of their fair market value was made by the Company’s Board of Directors
or by an independent valuation firm retained by the Company. I acknowledge that there is no guarantee in either case that the Internal Revenue Service will agree with the valuation, and I will not make any claim against the Company or its Board of
Directors, officers or employees in the event that the Internal Revenue Service asserts that the valuation was too low. 

  

	13.	 I agree to seek the consent of my spouse to the extent required by the Company to enforce the foregoing.

  

							
	SIGNATURE:	 		 		 	DATE:
				
	 	 		 		 	  

  
 3 

 SECTION 83(b) ELECTION 

The undersigned taxpayer hereby elects, pursuant to Sections 55 and 83(b) of the Internal Revenue Code of 1986, as amended, and pursuant to Treasury
Regulations Section 1.83-2, to include in gross income as compensation for services the excess (if any) of the fair market value of the shares described below over an amount paid for those shares. 

 

	 	A.	 The taxpayer who performed the services is: 

Name:                     
                                       

Address: 
                                        
               
  

                       
                                         
       
  

	 	

 Social Security No.:
                                         
                    
  

	 	B.	 The property with respect to which the election is made is ______ shares of the common stock of RAPT
Therapeutics, Inc. 

  

	 	C.	 The property was transferred to the taxpayer on __________ ___, _____. 

 

	 	D.	 The taxable year for which the election is made is the calendar year _____. 

 

	 	E.	 The property is subject to a repurchase right pursuant to which the issuer has the right to acquire the
property if for any reason taxpayer’s service with the issuer terminates. The issuer’s repurchase right lapses in a series of installments over a ______-year period ending on __________ ___, _____. 

 

	 	F.	 The fair market value of such property at the time of transfer (determined without regard to any restriction
other than a restriction that by its terms will never lapse) is $_____ per share x _____ shares = $_________. 

  

	 	G.	 For the property transferred, the taxpayer paid $_____ per share × _____ shares = $_____.

  

	 	H.	 The amount to include in gross income is $__________. [The amount in Item F less the amount in Item
G] 

  

	 	I.	 This statement is executed on __________ ___, _____. 

 

					
			
	  
	 		 	  

	Signature of Spouse (if any)	 		 	Signature of Taxpayer

 Within 30 days after the date of transfer of the property, this election must be filed with the Internal Revenue Service
office where the taxpayer files his or her annual federal income tax return. The filing should be made by registered or certified mail, return receipt requested. The taxpayer must (a) include a copy of the completed form with his or her federal
income tax return for the taxable year in which the property is transferred and (b) deliver an additional copy to the Company.

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