Document:

EX-10.5(D)

 Exhibit 10.5(d) 

IDEAYA BIOSCIENCES, INC. 

2019 INCENTIVE AWARD PLAN 

RESTRICTED STOCK UNIT AWARD GRANT NOTICE 

IDEAYA Biosciences, Inc., a Delaware corporation, (the “Company”), pursuant to its 2019 Incentive Award Plan, as
amended from time to time (the “Plan”), hereby grants to the holder listed below (the “Participant”), an award of restricted stock units (“Restricted Stock Units”
or “RSUs”). Each vested Restricted Stock Unit represents the right to receive, in accordance with the Restricted Stock Unit Award Agreement attached hereto as Exhibit A (the
“Agreement”), one share of Common Stock (“Share”). This award of Restricted Stock Units is subject to all of the terms and conditions set forth herein and in the Agreement and the Plan, each of which
are incorporated herein by reference. Unless otherwise defined herein, the terms defined in the Plan shall have the same defined meanings in this Restricted Stock Unit Award Grant Notice (the “Grant Notice”) and the
Agreement. 
  

			
	Participant:	  	[__________________________]
		
	Grant Date:	  	[__________________________]
		
	Total Number of RSUs:	  	[_________________]
		
	Vesting Commencement Date:	  	[_________________]
		
	Vesting Schedule:	  	[_________________]
		
	Termination:	  	If the Participant experiences a Termination of Service, all RSUs that have not become vested on or prior to the date of such Termination of Service will thereupon be automatically forfeited by the Participant without payment of
any consideration therefor.

 By his or her signature and the Company’s signature below, the Participant agrees to be bound by the
terms and conditions of the Plan, the Agreement and this Grant Notice. The Participant has reviewed the Plan, the Agreement and this Grant Notice in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Grant
Notice and fully understands all provisions of the Plan, the Agreement and this Grant Notice. The Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising
under the Plan, the Agreement or this Grant Notice. In addition, by signing below, the Participant also agrees that the Company, in its sole discretion, may satisfy any withholding obligations in accordance with Section 2.6(b) of the Agreement
by (i) withholding shares of Common Stock otherwise issuable to the Participant upon vesting of the RSUs, (ii) instructing a broker on the Participant’s behalf to sell shares of Common Stock otherwise issuable to the Participant upon
vesting of the RSUs and submit the proceeds of such sale to the Company, or (iii) using any other method permitted by Section 2.6(b) of the Agreement or the Plan. 
  

							
	IDEAYA BIOSCIENCES, INC.:	  	PARTICIPANT:
				
	By:	 	 	  	By:	  	 
				
	Print Name:	 	 	  	Print Name:	  	 
				
	Title:	 	 	  		  	 
				
	Address:	 	 	  	Address:	  	 

  

 EXHIBIT A 

TO RESTRICTED STOCK UNIT AWARD GRANT NOTICE 

RESTRICTED STOCK UNIT AWARD AGREEMENT 

Pursuant to the Restricted Stock Unit Award Grant Notice (the “Grant Notice”) to which this Restricted Stock Unit
Award Agreement (this “Agreement”) is attached, IDEAYA Biosciences, Inc., a Delaware corporation (the “Company”), has granted to the Participant the number of restricted stock units
(“Restricted Stock Units” or “RSUs”) set forth in the Grant Notice under the Company’s 2019 Incentive Award Plan, as amended from time to time (the
“Plan”). Each Restricted Stock Unit represents the right to receive one share of Common Stock (a “Share”) upon vesting. 

ARTICLE I. 
 GENERAL

 1.1    Defined Terms. Capitalized terms not specifically defined herein shall have the meanings specified
in the Plan and the Grant Notice. 
 1.2    Incorporation of Terms of Plan. The RSUs are subject to the terms and
conditions of the Plan, which are incorporated herein by reference. In the event of any inconsistency between the Plan and this Agreement, the terms of the Plan shall control. 

ARTICLE II. 
 GRANT OF
RESTRICTED STOCK UNITS 
 2.1    Grant of RSUs. Pursuant to the Grant Notice and upon the terms and
conditions set forth in the Plan and this Agreement, effective as of the Grant Date set forth in the Grant Notice, the Company hereby grants to the Participant an award of RSUs under the Plan in consideration of the Participant’s past or
continued employment with or service to the Company or any Subsidiaries and for other good and valuable consideration. 

2.2    Unsecured Obligation to RSUs. Unless and until the RSUs have vested in the manner set forth in Article 2
hereof, the Participant will have no right to receive Common Stock under any such RSUs. Prior to actual payment of any vested RSUs, such RSUs will represent an unsecured obligation of the Company, payable (if at all) only from the general assets of
the Company. 
 2.3    Vesting Schedule. Subject to Section 2.5 hereof, the RSUs shall vest and become
nonforfeitable with respect to the applicable portion thereof according to the vesting schedule set forth in the Grant Notice (rounding down to the nearest whole Share). 

2.4    Consideration to the Company. In consideration of the grant of the award of RSUs pursuant hereto, the
Participant agrees to render faithful and efficient services to the Company or any Subsidiary. 
 2.5    Forfeiture,
Termination and Cancellation upon Termination of Service. Notwithstanding any contrary provision of this Agreement or the Plan, upon the Participant’s Termination of Service for any or no reason, all Restricted Stock Units which have not
vested prior to or in connection with such Termination of Service shall thereupon automatically be forfeited, terminated and cancelled as of the applicable termination date without payment of any consideration by the Company, and the

  
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Participant, or the Participant’s beneficiary or personal representative, as the case may be, shall have no further rights hereunder. No portion of the RSUs which has not become vested as of
the date on which the Participant incurs a Termination of Service shall thereafter become vested. 
 2.6    Issuance
of Common Stock upon Vesting. 
 (a)    As soon as administratively practicable following the vesting of any
Restricted Stock Units pursuant to Section 2.3 hereof, but in no event later than 30 days after such vesting date (for the avoidance of doubt, this deadline is intended to comply with the “short term deferral” exemption from
Section 409A of the Code), the Company shall deliver to the Participant (or any transferee permitted under Section 3.2 hereof) a number of Shares equal to the number of RSUs subject to this Award that vest on the applicable vesting date.
Notwithstanding the foregoing, in the event Shares cannot be issued pursuant to Section 10.7 of the Plan, the Shares shall be issued pursuant to the preceding sentence as soon as administratively practicable after the Administrator determines
that Shares can again be issued in accordance with such Section. 
 (b)    As set forth in Section 10.5 of the
Plan, the Company shall have the authority and the right to deduct or withhold, or to require the Participant to remit to the Company, an amount sufficient to satisfy all applicable federal, state and local taxes required by law to be withheld with
respect to any taxable event arising in connection with the Restricted Stock Units. The Company shall not be obligated to deliver any Shares to the Participant or the Participant’s legal representative unless and until the Participant or the
Participant’s legal representative shall have paid or otherwise satisfied in full the amount of all federal, state and local taxes applicable to the taxable income of the Participant resulting from the grant or vesting of the Restricted Stock
Units or the issuance of Shares. 
 2.7    Conditions to Delivery of Shares. The Shares deliverable hereunder may
be either previously authorized but unissued Shares, treasury Shares or issued Shares which have then been reacquired by the Company. Such Shares shall be fully paid and nonassessable. The Company shall not be required to issue Shares deliverable
hereunder prior to fulfillment of the conditions set forth in Section 10.7 of the Plan. 
 2.8    Rights as
Stockholder. The holder of the RSUs shall not be, nor have any of the rights or privileges of, a stockholder of the Company, including, without limitation, voting rights and rights to dividends, in respect of the RSUs and any Shares underlying
the RSUs and deliverable hereunder unless and until such Shares shall have been issued by the Company and held of record by such holder (as evidenced by the appropriate entry on the books of the Company or of a duly authorized transfer agent of the
Company). No adjustment shall be made for a dividend or other right for which the record date is prior to the date the Shares are issued, except as provided in Article IX of the Plan. 

ARTICLE III. 
 OTHER
PROVISIONS 
 3.1    Administration. The Administrator shall have the power to interpret the Plan and this
Agreement and to adopt such rules for the administration, interpretation and application of the Plan as are consistent therewith and to interpret, amend or revoke any such rules. All actions taken and all interpretations and determinations made by
the Administrator in good faith shall be final and binding upon the Participant, the Company and all other interested persons. No member of the Administrator or the Board shall be personally liable for any action, determination or interpretation
made in good faith with respect to the Plan, this Agreement or the RSUs. 

  
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 3.2    RSUs Not Transferable. The RSUs shall be subject to the
restrictions on transferability set forth in Section 10.1 of the Plan. 
 3.3    Tax Consultation. The
Participant understands that the Participant may suffer adverse tax consequences in connection with the RSUs granted pursuant to this Agreement (and the Shares issuable with respect thereto). The Participant represents that the Participant has
consulted with any tax consultants the Participant deems advisable in connection with the RSUs and the issuance of Shares with respect thereto and that the Participant is not relying on the Company for any tax advice. 

3.4    Binding Agreement. Subject to the limitation on the transferability of the RSUs contained herein, this
Agreement will be binding upon and inure to the benefit of the heirs, legatees, legal representatives, successors and assigns of the parties hereto. 

3.5    Adjustments Upon Specified Events. The Administrator may accelerate the vesting of the RSUs in such
circumstances as it, in its sole discretion, may determine. The Participant acknowledges that the RSUs are subject to adjustment, modification and termination in certain events as provided in this Agreement and Article IX of the Plan. 

3.6    Notices. Any notice to be given under the terms of this Agreement to the Company shall be addressed to the
Company in care of the Secretary of the Company at the Company’s principal office, and any notice to be given to the Participant shall be addressed to the Participant at the Participant’s last address reflected on the Company’s
records. By a notice given pursuant to this Section 3.6, either party may hereafter designate a different address for notices to be given to that party. Any notice shall be deemed duly given when sent via email or when sent by certified mail
(return receipt requested) and deposited (with postage prepaid) in a post office or branch post office regularly maintained by the United States Postal Service. 

3.7    Participant’s Representations. If the Shares issuable hereunder have not been registered under the
Securities Act or any applicable state laws on an effective registration statement at the time of such issuance, the Participant shall, if required by the Company, concurrently with such issuance, make such written representations as are deemed
necessary or appropriate by the Company or its counsel. 
 3.8    Titles. Titles are provided herein for
convenience only and are not to serve as a basis for interpretation or construction of this Agreement. 

3.9    Governing Law. The laws of the State of Delaware shall govern the interpretation, validity, administration,
enforcement and performance of the terms of this Agreement regardless of the law that might be applied under principles of conflicts of laws. 

3.10    Conformity to Securities Laws. The Participant acknowledges that the Plan and this Agreement are intended
to conform to the extent necessary with all provisions of the Securities Act and the Exchange Act and any other Applicable Law. Notwithstanding anything herein to the contrary, the Plan shall be administered, and the RSUs are granted, only in such a
manner as to conform to Applicable Law. To the extent permitted by Applicable Law, the Plan and this Agreement shall be deemed amended to the extent necessary to conform to such Applicable Law. 

3.11    Amendment, Suspension and Termination. To the extent permitted by the Plan, this Agreement may be wholly or
partially amended or otherwise modified, suspended or terminated at any time or from time to time by the Administrator or the Board; provided, however, that, except as may otherwise be provided by the Plan, no amendment, modification,
suspension or termination of this 

  
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Agreement shall adversely affect the RSUs in any material way without the prior written consent of the Participant.     

3.12    Successors and Assigns. The Company may assign any of its rights under this Agreement to single or multiple
assignees, and this Agreement shall inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer herein set forth in Section 3.2 hereof, this Agreement shall be binding upon the Participant and his
or her heirs, executors, administrators, successors and assigns. 
 3.13    Limitations Applicable to
Section 16 Persons. Notwithstanding any other provision of the Plan or this Agreement, if the Participant is subject to Section 16 of the Exchange Act, then the Plan, the RSUs and this Agreement shall be subject to any
additional limitations set forth in any applicable exemptive rule under Section 16 of the Exchange Act (including any amendment to Rule 16b-3 of the Exchange Act) that are requirements for the application
of such exemptive rule. To the extent permitted by Applicable Law, this Agreement shall be deemed amended to the extent necessary to conform to such applicable exemptive rule. 

3.14    Not a Contract of Service Relationship. Nothing in this Agreement or in the Plan shall confer upon
Participant any right to continue to serve as an employee or other service provider of the Company or any of its Subsidiaries or interfere with or restrict in any way with the right of the Company or any of its Subsidiaries, which rights are hereby
expressly reserved, to discharge or to terminate for any reason whatsoever, with or without cause, the services of the Participant at any time. 

3.15    Entire Agreement. The Plan, the Grant Notice and this Agreement (including all Exhibits thereto, if any)
constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and the Participant with respect to the subject matter hereof. 

3.16    Section 409A. This Award is not intended to constitute “nonqualified deferred compensation”
within the meaning of Section 409A of the Code (together with any Department of Treasury regulations and other interpretive guidance issued thereunder, including without limitation any such regulations or other guidance that may be issued after
the date hereof, “Section 409A”). However, notwithstanding any other provision of the Plan, the Grant Notice or this Agreement, if at any time the Administrator determines that this Award (or
any portion thereof) may be subject to Section 409A, the Administrator shall have the right in its sole discretion (without any obligation to do so or to indemnify Participant or any other person for failure to do so) to adopt such amendments
to the Plan, the Grant Notice or this Agreement, or adopt other policies and procedures (including amendments, policies and procedures with retroactive effect), or take any other actions, as the Administrator determines are necessary or appropriate
for this Award either to be exempt from the application of Section 409A or to comply with the requirements of Section 409A. 

3.17    Limitation on Participant’s Rights. Participation in the Plan confers no rights or interests other
than as herein provided. This Agreement creates only a contractual obligation on the part of the Company as to amounts payable and shall not be construed as creating a trust. Neither the Plan nor any underlying program, in and of itself, has any
assets. The Participant shall have only the rights of a general unsecured creditor of the Company and its Subsidiaries with respect to amounts credited and benefits payable, if any, with respect to the RSUs, and rights no greater than the right to
receive the Common Stock as a general unsecured creditor with respect to RSUs, as and when payable hereunder. 

*    *    *    *    * 

  
 A-5EX-10.6

 Exhibit 10.6 

IDEAYA BIOSCIENCES, INC. 

EMPLOYEE STOCK PURCHASE PLAN 

ARTICLE I. 
 PURPOSE

 The Plan’s purpose is to assist employees of the Company and its Designated Subsidiaries in acquiring a stock ownership interest
in the Company pursuant to a plan which is intended to qualify as an “employee stock purchase plan” under Section 423 of the Code, and to help such employees provide for their future security and to encourage them to remain in the
employment of the Company and its Subsidiaries. 
 ARTICLE II. 

DEFINITIONS 
 As used in
the Plan, the following words and phrases have the meanings specified below, unless the context clearly indicates otherwise: 
 2.1
“Administrator” means the Committee, or such individuals to which authority to administer the Plan has been delegated under Section 7.1 hereof. 

2.2 “Agent” means the brokerage firm, bank or other financial institution, entity or person(s), if any, engaged,
retained, appointed or authorized to act as the agent of the Company or an Employee with regard to the Plan. 
 2.3
“Board” means the Board of Directors of the Company. 
 2.4 “Code” means the U.S. Internal
Revenue Code of 1986, as amended, and all regulations, guidance, compliance programs and other interpretative authority issued thereunder. 

2.5 “Committee” means the Compensation Committee of the Board. 

2.6 “Common Stock” means the common stock of the Company. 

2.7 “Company” means IDEAYA Biosciences, Inc., a Delaware corporation, or any successor. 

2.8 “Compensation” of an Employee means the regular earnings or base salary paid to the Employee from the Company on
each Payday as compensation for services to the Company or any Designated Subsidiary, before deduction for any salary deferral contributions made by the Employee to any tax-qualified or nonqualified deferred
compensation plan, including overtime, shift differentials, vacation pay, salaried production schedule premiums, holiday pay, jury duty pay, funeral leave pay, paid time off, military pay, prior week adjustments and weekly bonus, but excluding
education or tuition reimbursements, imputed income arising under any group insurance or benefit program, travel expenses, business and moving reimbursements, including tax gross ups and taxable mileage allowance, income received in connection with
any stock options, restricted stock, restricted stock units or other compensatory equity awards and all contributions made by the Company or any Designated Subsidiary for the Employee’s benefit under any employee benefit plan now or hereafter
established. Such Compensation shall be calculated before deduction of any income or employment tax withholdings, but shall be withheld from the Employee’s net income. 
  

 2.9 “Designated Subsidiary” means each Subsidiary that has been
designated by the Board or Committee from time to time in its sole discretion as eligible to participate in the Plan, including any Subsidiary in existence on the Effective Date and any Subsidiary formed or acquired following the Effective Date, in
accordance with Section 7.2 hereof. 
 2.10 “Effective Date” means the date immediately prior to the date the
Company’s registration statement relating to its initial public offering becomes effective, provided that the Board has adopted the Plan prior to or on such date, subject to approval of the Plan by the Company’s stockholders in
accordance with Section 7.7 hereof. 
 2.11 “Eligible Employee” means an Employee who: 

(a) is customarily scheduled to work at least 20 hours per week; 

(b) whose customary employment is more than five months in a calendar year; and 

(c) after the granting of the Option would not be deemed for purposes of Section 423(b)(3) of the Code to possess 5% or more of the total
combined voting power or value of all classes of stock of the Company or any Subsidiary. 
 For purposes of clause (c), the rules of Section 424(d) of
the Code with regard to the attribution of stock ownership shall apply in determining the stock ownership of an individual, and stock which an Employee may purchase under outstanding options shall be treated as stock owned by the Employee. 

Notwithstanding the foregoing, the Administrator may exclude from participation in the Plan as an Eligible Employee: 

(x) any Employee that is a “highly compensated employee” of the Company or any Designated Subsidiary (within the meaning of
Section 414(q) of the Code), or that is such a “highly compensated employee” (A) with compensation above a specified level, (B) who is an officer or (C) who is subject to the disclosure requirements of Section 16(a) of
the Exchange Act; or 
 (y) any Employee who is a citizen or resident of a foreign jurisdiction (without regard to whether they are also a
citizen of the United States or a resident alien (within the meaning of Section 7701(b)(1)(A) of the Code)) if either (A) the grant of the Option is prohibited under the laws of the jurisdiction governing such Employee, or
(B) compliance with the laws of the foreign jurisdiction would cause the Plan or the Option to violate the requirements of Section 423 of the Code; 

provided that any exclusion in clauses (x) or (y) shall be applied in an identical manner under each Offering Period to all Employees of the
Company and all Designated Subsidiaries, in accordance with Treasury Regulation Section 1.423-2(e). 

2.12 “Employee” means any person who renders services to the Company or a Designated Subsidiary in the status of an
employee within the meaning of Section 3401(c) of the Code. “Employee” shall not include any director of the Company or a Designated Subsidiary who does not render services to the Company or a Designated Subsidiary in the status of an
employee within the meaning of Section 3401(c) of the Code. For purposes of the Plan, the employment relationship shall be treated as continuing intact while the individual is on military leave, sick leave or other leave of absence

  
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approved by the Company or a Designated Subsidiary and meeting the requirements of Treasury Regulation Section 1.421-1(h)(2). Where the period of
leave exceeds three months, or such other period specified in Treasury Regulation Section 1.421-1(h)(2), and the individual’s right to reemployment is not guaranteed either by statute or by contract,
the employment relationship shall be deemed to have terminated on the first day immediately following such three-month period, or such other period specified in Treasury Regulation Section 1.421-1(h)(2).

 2.13 “Enrollment Date” means the first date of each Offering Period. 

2.14 “Exercise Date” means the last day of each Offering Period, except as provided in Section 5.2 hereof. 

2.15 “Exchange Act” means the Securities Exchange Act of 1934, as amended. 

2.16 “Fair Market Value” means, as of any date, the value of Common Stock determined as follows: 

(a) If the Common Stock is (i) listed on any established securities exchange (such as the New York Stock Exchange, the NASDAQ Global
Market or the NASDAQ Global Select Market), (ii) listed on any national market system or (iii) listed, quoted or traded on any automated quotation system, its Fair Market Value shall be the closing sales price for a share of Common Stock as
quoted on such exchange or system for such date or, if there is no closing sales price for a share of Common Stock on the date in question, the closing sales price for a share of Stock on the last preceding date for which such quotation exists, as
reported in The Wall Street Journal or such other source as the Administrator deems reliable; 
 (b) If the Common Stock is not listed
on an established securities exchange, national market system or automated quotation system, but the Common Stock is regularly quoted by a recognized securities dealer, its Fair Market Value shall be the mean of the high bid and low asked prices for
such date or, if there are no high bid and low asked prices for a share of Common Stock on such date, the high bid and low asked prices for a share of Common Stock on the last preceding date for which such information exists, as reported in The
Wall Street Journal or such other source as the Administrator deems reliable; or 
 (c) If the Common Stock is neither listed on an
established securities exchange, national market system or automated quotation system nor regularly quoted by a recognized securities dealer, its Fair Market Value shall be established by the Administrator in good faith. 

2.17 “Grant Date” means the first day of an Offering Period. 

2.18 “New Exercise Date” has the meaning set forth in Section 5.2(b) hereof. 

2.19 “Offering Period” means such period of time commencing on such date(s) as determined by the Board or Committee, in
its sole discretion, and with respect to which Options shall be granted to Participants. The duration and timing of Offering Periods may be established or changed by the Board or Committee at any time, in its sole discretion. Notwithstanding the
foregoing, in no event may an Offering Period exceed 27 months. 
 2.20 “Option” means the right to purchase shares
of Common Stock pursuant to the Plan during each Offering Period. 

  
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 2.21 “Option Price” means the purchase price of a share of Common
Stock hereunder as provided in Section 4.2 hereof. 
 2.22 “Parent” means any entity that is a parent
corporation of the Company within the meaning of Section 424 of the Code. 
 2.23 “Participant” means any
Eligible Employee who elects to participate in the Plan. 
 2.24 “Payday” means the regular and recurring established
day for payment of Compensation to an Employee of the Company or any Designated Subsidiary. 
 2.25 “Plan” means this
Employee Stock Purchase Plan. 
 2.26 “Plan Account” means a bookkeeping account established and maintained by the
Company in the name of each Participant. 
 2.27 “Section 423 Option” has the
meaning set forth in Section 3.1(b) hereof. 
 2.28 “Subsidiary” means any entity that is a subsidiary
corporation of the Company within the meaning of Section 424 of the Code. In addition, with respect to any sub-plans adopted under Section 7.1(d) hereof which are designed to be outside the scope of
Section 423 of the Code, Subsidiary shall include any corporate or noncorporate entity in which the Company has a direct or indirect equity interest or significant business relationship. 

2.29 “Trading Day” means a day on which the principal securities exchange on which the Common Stock is listed is open
for trading or, if the Common Stock is not listed on a securities exchange, means a business day, as determined by the Administrator in good faith. 

2.30 “Withdrawal Election” has the meaning set forth in Section 6.1(a) hereof. 

ARTICLE III. 

PARTICIPATION 
 3.1
Eligibility. 
 (a) Any Eligible Employee who is employed by the Company or a Designated Subsidiary on a given Enrollment Date for an
Offering Period shall be eligible to participate in the Plan during such Offering Period, subject to the requirements of Articles IV and V hereof, and the limitations imposed by Section 423(b) of the Code. 

(b) No Eligible Employee shall be granted an Option under the Plan which permits the Participant’s rights to purchase shares of Common
Stock under the Plan, and to purchase stock under all other employee stock purchase plans of the Company, any Parent or any Subsidiary subject to Section 423 of the Code (any such Option or other option, a
“Section 423 Option”), to accrue at a rate which exceeds $25,000 of fair market value of such stock (determined at the time the Section 423 Option is granted) for each calendar year in which any
Section 423 Option granted to the Participant is outstanding at any time. The limitation under this Section 3.1(b) shall be applied in accordance with Section 423(b)(8) of the Code. 

  
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 3.2 Election to Participate; Payroll Deductions 

(a) Except as provided in Section 3.3 hereof, an Eligible Employee may become a Participant in the Plan only by means of payroll
deduction. Each individual who is an Eligible Employee as of an Offering Period’s Enrollment Date may elect to participate in such Offering Period and the Plan by delivering to the Company a payroll deduction authorization no later than the
period of time prior to the applicable Enrollment Date that is determined by the Administrator, in its sole discretion. 
 (b) Subject to
Section 3.1(b) hereof, payroll deductions (i) shall be equal to at least 1% of the Participant’s Compensation as of each Payday of the Offering Period following the Enrollment Date, but not more than 15% of the
Participant’s Compensation as of each Payday of the Offering Period following the Enrollment Date; and (ii) may be expressed either as (A) a whole number percentage, or (B) a fixed dollar amount. Amounts deducted from a
Participant’s Compensation with respect to an Offering Period pursuant to this Section 3.2 shall be deducted each Payday through payroll deduction and credited to the Participant’s Plan Account. 

(c) Following at least one payroll deduction, a Participant may decrease (to as low as zero) the amount deducted from such Participant’s
Compensation only once during an Offering Period upon ten calendar days’ prior written notice to the Company. A Participant may not increase the amount deducted from such Participant’s Compensation during an Offering Period. 

(d) Notwithstanding the foregoing, upon the termination of an Offering Period, each Participant in such Offering Period shall automatically
participate in the immediately following Offering Period at the same payroll deduction percentage or fixed amount as in effect at the termination of the prior Offering Period, unless such Participant delivers to the Company a different election with
respect to the successive Offering Period in accordance with Section 3.2(a) hereof, or unless such Participant becomes ineligible for participation in the Plan. 

3.3 Leave of Absence. During leaves of absence approved by the Company meeting the requirements of Treasury Regulation Section 1.421-1(h)(2), a Participant may continue participation in the Plan by making cash payments to the Company on his or her normal payday equal to his or her authorized payroll deduction. 

ARTICLE IV. 
 PURCHASE OF
SHARES 
 4.1 Grant of Option. Each Participant shall be granted an Option with respect to an Offering Period on the applicable
Grant Date. Subject to the limitations of Section 3.1(b) hereof, the number of shares of Common Stock subject to a Participant’s Option shall be determined by dividing (a) such Participant’s payroll deductions accumulated prior
to an Exercise Date and retained in the Participant’s Plan Account on such Exercise Date by (b) the applicable Option Price; provided that in no event shall a Participant be permitted to purchase during each Offering Period more
than 4,000 shares of Common Stock (subject to any adjustment pursuant to Section 5.2 hereof). The Administrator may, for future Offering Periods, increase or decrease, in its absolute discretion, the maximum number of shares of Common Stock
that a Participant may purchase during such future Offering Periods. Each Option shall expire on the Exercise Date for the applicable Offering Period immediately after the automatic exercise of the Option in accordance with Section 4.3 hereof,
unless such Option terminates earlier in accordance with Article 6 hereof. 

  
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 4.2 Option Price. The “Option Price” per share of Common
Stock to be paid by a Participant upon exercise of the Participant’s Option on the applicable Exercise Date for an Offering Period shall be equal to 85% of the lesser of the Fair Market Value of a share of Common Stock on (a) the
applicable Grant Date and (b) the applicable Exercise Date; provided that in no event shall the Option Price per share of Common Stock be less than the par value per share of the Common Stock. 

4.3 Purchase of Shares. 

(a) On the applicable Exercise Date for an Offering Period, each Participant shall automatically and without any action on such
Participant’s part be deemed to have exercised his or her Option to purchase at the applicable per share Option Price the largest number of whole shares of Common Stock which can be purchased with the amount in the Participant’s Plan
Account. Any balance less than the per share Option Price that is remaining in the Participant’s Plan Account (after exercise of such Participant’s Option) as of the Exercise Date shall be carried forward to the next Offering Period,
unless the Participant has elected to withdraw from the Plan pursuant to Section 6.1 hereof or, pursuant to Section 6.2 hereof, such Participant has ceased to be an Eligible Employee. Any balance not carried forward to the next Offering
Period in accordance with the prior sentence promptly shall be refunded to the applicable Participant. For the avoidance of doubt, in no event shall an amount greater than or equal to the per share Option Price as of an Exercise Date be carried
forward to the next Offering Period. 
 (b) As soon as practicable following the applicable Exercise Date, the number of shares of Common
Stock purchased by such Participant pursuant to Section 4.3(a) hereof shall be delivered (either in share certificate or book entry form), in the Company’s sole discretion, to either (i) the Participant or (ii) an account
established in the Participant’s name at a stock brokerage or other financial services firm designated by the Company. If the Company is required to obtain from any commission or agency authority to issue any such shares of Common Stock, the
Company shall seek to obtain such authority. Inability of the Company to obtain from any such commission or agency authority which counsel for the Company deems necessary for the lawful issuance of any such shares shall relieve the Company from
liability to any Participant except to refund to the Participant such Participant’s Plan Account balance, without interest thereon. 

4.4 Transferability of Rights. An Option granted under the Plan shall not be transferable, other than by will or the applicable laws of
descent and distribution, and is exercisable during the Participant’s lifetime only by the Participant. No option or interest or right to the Option shall be available to pay off any debts, contracts or engagements of the Participant or his or
her successors in interest or shall be subject to disposition by pledge, encumbrance, assignment or any other means whether such disposition be voluntary or involuntary or by operation of law by judgment, levy, attachment, garnishment or any other
legal or equitable proceedings (including bankruptcy), and any attempt at disposition of the Option shall have no effect. 
 ARTICLE V.

 PROVISIONS RELATING TO COMMON STOCK 

5.1 Common Stock Reserved. Subject to adjustment as provided in Section 5.2 hereof, the maximum number of shares of Common Stock
that shall be made available for sale under the Plan shall be the sum of (a) 195,000 shares and (b) an annual increase on the first day of each year beginning in 2020 and ending in 2029 equal to the lesser of (i) 1% of the shares outstanding
(on an as converted basis) on the last day of the immediately preceding fiscal year and (ii) such number of shares as may be determined by the Board; provided, however, no more than 2,500,000 shares may be issued under the Plan. Shares
made available for sale under the Plan may be authorized but unissued shares, treasury shares of Common Stock, or reacquired shares reserved for issuance under the Plan. 

  
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 5.2 Adjustments Upon Changes in Capitalization, Dissolution, Liquidation, Merger or Asset
Sale. 
 (a) Changes in Capitalization. Subject to any required action by the stockholders of the Company, the number of shares of
Common Stock which have been authorized for issuance under the Plan but not yet placed under Option, as well as the price per share and the number of shares of Common Stock covered by each Option under the Plan which has not yet been exercised shall
be proportionately adjusted for any increase or decrease in the number of issued shares of Common Stock resulting from a stock split, reverse stock split, stock dividend, combination or reclassification of the Common Stock, or any other increase or
decrease in the number of shares of Common Stock effected without receipt of consideration by the Company; provided, however, that conversion of any convertible securities of the Company shall not be deemed to have been “effected
without receipt of consideration.” Such adjustment shall be made by the Administrator, whose determination in that respect shall be final, binding and conclusive. Except as expressly provided herein, no issuance by the Company of shares of
stock of any class, or securities convertible into shares of stock of any class, shall affect, and no adjustment by reason thereof shall be made with respect to, the number or price of shares of Common Stock subject to an Option. 

(b) Dissolution or Liquidation. In the event of the proposed dissolution or liquidation of the Company, the Offering Period then in
progress shall be shortened by setting a new Exercise Date (the “New Exercise Date”), and shall terminate immediately prior to the consummation of such proposed dissolution or liquidation, unless provided otherwise by the
Administrator. The New Exercise Date shall be before the date of the Company’s proposed dissolution or liquidation. The Administrator shall notify each Participant in writing, at least ten business days prior to the New Exercise Date, that
the Exercise Date for the Participant’s Option has been changed to the New Exercise Date and that the Participant’s Option shall be exercised automatically on the New Exercise Date, unless prior to such date the Participant has withdrawn
from the Offering Period as provided in Section 6.1 hereof. 
 (c) Merger or Asset Sale. In the event of a proposed sale of all
or substantially all of the assets of the Company, or the merger of the Company with or into another corporation, each outstanding Option shall be assumed or an equivalent Option substituted by the successor corporation or a Parent or Subsidiary of
the successor corporation. In the event that the successor corporation refuses to assume or substitute for the Option, any Offering Periods then in progress shall be shortened by setting a New Exercise Date and any Offering Periods then in progress
shall end on the New Exercise Date. The New Exercise Date shall be before the date of the Company’s proposed sale or merger. The Administrator shall notify each Participant in writing, at least ten business days prior to the New Exercise Date,
that the Exercise Date for the Participant’s Option has been changed to the New Exercise Date and that the Participant’s Option shall be exercised automatically on the New Exercise Date, unless prior to such date the Participant has
withdrawn from the Offering Period as provided in Section 6.1 hereof. 
 5.3 Insufficient Shares. If the Administrator determines
that, on a given Exercise Date, the number of shares of Common Stock with respect to which Options are to be exercised may exceed the number of shares of Common Stock remaining available for sale under the Plan on such Exercise Date, the
Administrator shall make a pro rata allocation of the shares of Common Stock available for issuance on such Exercise Date in as uniform a manner as shall be practicable and as it shall determine in its sole discretion to be equitable among all
Participants exercising Options to purchase Common Stock on such Exercise Date, and unless additional shares are authorized for issuance under the Plan, no further Offering Periods shall take place and the Plan shall terminate pursuant to
Section 7.5 hereof. If an Offering Period is so terminated, then the balance of the amount credited to the Participant’s Plan Account which has not been applied to the purchase of shares of Common Stock shall be paid to such Participant in
one lump sum in cash within 30 days after such Exercise Date, without any interest thereon. 

  
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 5.4 Rights as Stockholders. With respect to shares of Common Stock subject to an
Option, a Participant shall not be deemed to be a stockholder of the Company and shall not have any of the rights or privileges of a stockholder. A Participant shall have the rights and privileges of a stockholder of the Company when, but not until,
shares of Common Stock have been deposited in the designated brokerage account following exercise of his or her Option. 
 ARTICLE VI.

 TERMINATION OF PARTICIPATION 

6.1 Cessation of Contributions; Voluntary Withdrawal. 

(a) A Participant may cease payroll deductions during an Offering Period and elect to withdraw from the Plan by delivering written notice of
such election to the Company in such form and at such time prior to the Exercise Date for such Offering Period as may be established by the Administrator (a “Withdrawal Election”). A Participant electing to withdraw from the
Plan may elect to either (i) withdraw all of the funds then credited to the Participant’s Plan Account as of the date on which the Withdrawal Election is received by the Company, in which case amounts credited to such Plan Account shall be
returned to the Participant in one lump-sum payment in cash within 30 days after such election is received by the Company, without any interest thereon, and the Participant shall cease to participate in the
Plan and the Participant’s Option for such Offering Period shall terminate; or (ii) exercise the Option for the maximum number of whole shares of Common Stock on the applicable Exercise Date with any remaining Plan Account balance returned
to the Participant in one lump-sum payment in cash within 30 days after such Exercise Date, without any interest thereon, and after such exercise cease to participate in the Plan. Upon receipt of a
Withdrawal Election, the Participant’s payroll deduction authorization and his or her Option to purchase under the Plan shall terminate. 

(b) A participant’s withdrawal from the Plan shall not have any effect upon his or her eligibility to participate in any similar plan
which may hereafter be adopted by the Company or in succeeding Offering Periods which commence after the termination of the Offering Period from which the Participant withdraws. 

(c) A Participant who ceases contributions to the Plan during any Offering Period shall not be permitted to resume contributions to the Plan
during that Offering Period. 
 6.2 Termination of Eligibility. Upon a Participant’s ceasing to be an Eligible Employee, for any
reason, such Participant’s Option for the applicable Offering Period shall automatically terminate, he or she shall be deemed to have elected to withdraw from the Plan, and such Participant’s Plan Account shall be paid to such Participant
or, in the case of his or her death, to the person or persons entitled thereto pursuant to applicable law, within 30 days after such cessation of being an Eligible Employee, without any interest thereon. 

ARTICLE VII. 
 GENERAL
PROVISIONS 
 7.1 Administration. 

(a) The Plan shall be administered by the Committee, which shall be composed of members of the Board. The Committee may delegate administrative
tasks under the Plan to the services of an Agent or Employees to assist in the administration of the Plan, including establishing and maintaining an individual securities account under the Plan for each Participant. 

  
 8 

 (b) It shall be the duty of the Administrator to conduct the general administration of the
Plan in accordance with the provisions of the Plan. The Administrator shall have the power, subject to, and within the limitations of, the express provisions of the Plan: 

(i) To establish and terminate Offering Periods; 

(ii) To determine when and how Options shall be granted and the provisions and terms of each Offering Period (which need not be
identical); 
 (iii) To select Designated Subsidiaries in accordance with Section 7.2 hereof; and 

(iv) To construe and interpret the Plan, the terms of any Offering Period and the terms of the Options and to adopt such rules
for the administration, interpretation, and application of the Plan as are consistent therewith and to interpret, amend or revoke any such rules. The Administrator, in the exercise of this power, may correct any defect, omission or inconsistency in
the Plan, any Offering Period or any Option, in a manner and to the extent it shall deem necessary or expedient to administer the Plan, subject to Section 423 of the Code. 

(c) The Administrator may adopt rules or procedures relating to the operation and administration of the Plan to accommodate the specific
requirements of local laws and procedures. Without limiting the generality of the foregoing, the Administrator is specifically authorized to adopt rules and procedures regarding handling of participation elections, payroll deductions, payment of
interest, conversion of local currency, payroll tax, withholding procedures and handling of stock certificates which vary with local requirements. In its absolute discretion, the Board may at any time and from time to time exercise any and all
rights and duties of the Administrator under the Plan. 
 (d) The Administrator may adopt sub-plans
applicable to particular Designated Subsidiaries or locations, which sub-plans may be designed to be outside the scope of Section 423 of the Code. The rules of such
sub-plans may take precedence over other provisions of this Plan, with the exception of Section 5.1 hereof, but unless otherwise superseded by the terms of such sub-plan, the provisions of this Plan shall
govern the operation of such sub-plan. 
 (e) All expenses and liabilities incurred by the Administrator in connection with the
administration of the Plan shall be borne by the Company. The Administrator may, with the approval of the Committee, employ attorneys, consultants, accountants, appraisers, brokers or other persons. The Administrator, the Company and its officers
and directors shall be entitled to rely upon the advice, opinions or valuations of any such persons. All actions taken and all interpretations and determinations made by the Administrator in good faith shall be final and binding upon all
Participants, the Company and all other interested persons. No member of the Board or Administrator shall be personally liable for any action, determination or interpretation made in good faith with respect to the Plan or the options, and all
members of the Board or Administrator shall be fully protected by the Company in respect to any such action, determination, or interpretation. 

7.2 Designation of Subsidiary Corporations. The Board or Committee shall designate from among the Subsidiaries, as determined from time
to time, the Subsidiary or Subsidiaries that shall constitute Designated Subsidiaries. The Board or Committee may designate a Subsidiary, or terminate the designation of a Subsidiary, without the approval of the stockholders of the Company. 

  
 9 

 7.3 Reports. Individual accounts shall be maintained for each Participant in the
Plan. Statements of Plan Accounts shall be given to Participants at least annually, which statements shall set forth the amounts of payroll deductions, the Option Price, the number of shares purchased and the remaining cash balance, if any. 

7.4 No Right to Employment. Nothing in the Plan shall be construed to give any person (including any Participant) the right to remain in
the employ of the Company, a Parent or a Subsidiary or to affect the right of the Company, any Parent or any Subsidiary to terminate the employment of any person (including any Participant) at any time, with or without cause, which right is
expressly reserved. 
 7.5 Amendment and Termination of the Plan. 

(a) The Board may, in its sole discretion, amend, suspend or terminate the Plan at any time and from time to time; provided,
however, that without approval of the Company’s stockholders given within 12 months before or after action by the Board, the Plan may not be amended to increase the maximum number of shares of Common Stock subject to the Plan or change
the designation or class of Eligible Employees; and provided, further that without approval of the Company’s stockholders, the Plan may not be amended in any manner that would cause the Plan to no longer be an “employee stock
purchase plan” within the meaning of Section 423(b) of the Code. 
 (b) In the event the Administrator determines that the ongoing
operation of the Plan may result in unfavorable financial accounting consequences, the Administrator may, to the extent permitted under Section 423 of the Code, in its discretion and, to the extent necessary or desirable, modify or amend the
Plan to reduce or eliminate such accounting consequence including, but not limited to: 
 (i) altering the Option Price for
any Offering Period including an Offering Period underway at the time of the change in Option Price; 
 (ii) shortening any
Offering Period so that the Offering Period ends on a new Exercise Date, including an Offering Period underway at the time of the Administrator action; and 

(iii) allocating shares of Common Stock. 

Such modifications or amendments shall not require stockholder approval or the consent of any Participant. 

(c) Upon termination of the Plan, the balance in each Participant’s Plan Account shall be refunded as soon as practicable after such
termination, without any interest thereon. 
 7.6 Use of Funds; No Interest Paid. All funds received by the Company by reason of
purchase of Common Stock under the Plan shall be included in the general funds of the Company free of any trust or other restriction and may be used for any corporate purpose. No interest shall be paid to any Participant or credited under the Plan.

 7.7 Term; Approval by Stockholders. No Option may be granted during any period of suspension of the Plan or after termination of
the Plan. The Plan shall be submitted for the approval of the Company’s stockholders within 12 months after the date of the Board’s initial adoption of the Plan. Options may be granted prior to such stockholder approval; provided,
however, that such Options shall not be exercisable prior to the time when the Plan is approved by the stockholders; provided, further that if such approval has not been obtained by the end of the
12-month period, all Options previously granted under the Plan shall thereupon terminate and be canceled and become null and void without being exercised. 

  
 10 

 7.8 Effect Upon Other Plans. The adoption of the Plan shall not affect any other
compensation or incentive plans in effect for the Company, any Parent or any Subsidiary. Nothing in the Plan shall be construed to limit the right of the Company, any Parent or any Subsidiary (a) to establish any other forms of incentives or
compensation for Employees of the Company or any Parent or any Subsidiary, or (b) to grant or assume Options otherwise than under the Plan in connection with any proper corporate purpose, including, but not by way of limitation, the grant or
assumption of options in connection with the acquisition, by purchase, lease, merger, consolidation or otherwise, of the business, stock or assets of any corporation, firm or association. 

7.9 Conformity to Securities Laws. Notwithstanding any other provision of the Plan, the Plan and the participation in the Plan by any
individual who is then subject to Section 16 of the Exchange Act shall be subject to any additional limitations set forth in any applicable exemption rule under Section 16 of the Exchange Act (including any amendment to Rule 16b-3 of the Exchange Act) that are requirements for the application of such exemptive rule. To the extent permitted by applicable law, the Plan shall be deemed amended to the extent necessary to conform to such
applicable exemptive rule. 
 7.10 Notice of Disposition of Shares. Each Participant shall give the Company prompt notice of any
disposition or other transfer of any shares of Common Stock, acquired pursuant to the exercise of an Option, if such disposition or transfer is made (a) within two years after the applicable Grant Date or (b) within one year after the
transfer of such shares of Common Stock to such Participant upon exercise of such Option. The Company may direct that any certificates evidencing shares acquired pursuant to the Plan refer to such requirement. 

7.11 Tax Withholding. The Company or any Parent or any Subsidiary shall be entitled to require payment in cash or deduction from other
compensation payable to each Participant of any sums required by federal, state or local tax law to be withheld with respect to any purchase of shares of Common Stock under the Plan or any sale of such shares. 

7.12 Governing Law. The Plan and all rights and obligations thereunder shall be construed and enforced in accordance with the laws of
the State of Delaware, without regard to the conflict of law rules thereof or of any other jurisdiction. 
 7.13 Notices. All notices
or other communications by a participant to the Company under or in connection with the Plan shall be deemed to have been duly given when received in the form specified by the Company at the location, or by the person, designated by the Company for
the receipt thereof. 
 7.14 Conditions To Issuance of Shares. 

(a) Notwithstanding anything herein to the contrary, the Company shall not be required to issue or deliver any certificates or make any book
entries evidencing shares of Common Stock pursuant to the exercise of an Option by a Participant, unless and until the Board or the Committee has determined, with advice of counsel, that the issuance of such shares of Common Stock is in compliance
with all applicable laws, regulations of governmental authorities and, if applicable, the requirements of any securities exchange or automated quotation system on which the shares of Common Stock are listed or traded, and the shares of Common Stock
are covered by an effective registration statement or applicable exemption from registration. In addition to the terms and conditions provided herein, the Board or the Committee may require that a Participant make such reasonable covenants,
agreements, and representations as the Board or the Committee, in its discretion, deems advisable in order to comply with any such laws, regulations, or requirements. 

  
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 (b) All certificates for shares of Common Stock delivered pursuant to the Plan and all
shares of Common Stock issued pursuant to book entry procedures are subject to any stop-transfer orders and other restrictions as the Committee deems necessary or advisable to comply with federal, state, or foreign securities or other laws, rules
and regulations and the rules of any securities exchange or automated quotation system on which the shares of Common Stock are listed, quoted, or traded. The Committee may place legends on any certificate or book entry evidencing shares of Common
Stock to reference restrictions applicable to the shares of Common Stock. 
 (c) The Committee shall have the right to require any
Participant to comply with any timing or other restrictions with respect to the settlement, distribution or exercise of any Option, including a window-period limitation, as may be imposed in the sole discretion of the Committee. 

(d) Notwithstanding any other provision of the Plan, unless otherwise determined by the Committee or required by any applicable law, rule or
regulation, the Company may, in lieu of delivering to any Participant certificates evidencing shares of Common Stock issued in connection with any Option, record the issuance of shares of Common Stock in the books of the Company (or, as applicable,
its transfer agent or stock plan administrator). 
 7.15 Equal Rights and Privileges. Except with respect to sub-plans designed to be outside the scope of Section 423 of the Code, all Eligible Employees of the Company (or of any Designated Subsidiary) shall have equal rights and privileges under this Plan to the
extent required under Section 423 of the Code so that this Plan qualifies as an “employee stock purchase plan” within the meaning of Section 423 of the Code. Any provision of this Plan that is inconsistent with Section 423
of the Code shall, without further act or amendment by the Company or the Board, be reformed to comply with the equal rights and privileges requirement of Section 423 of the Code. 

*    *    *    *    * 

I hereby certify that the foregoing Plan was adopted by the Board of Directors of IDEAYA Biosciences, Inc. on
                     , 2019. 
 I hereby certify that
the foregoing Plan was approved by the stockholders of IDEAYA Biosciences, Inc. on                      , 2019. 

Executed on                      , 2019. 

 

	
	  

	Corporate Secretary

  
 12

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