[Form 4] IDEAYA Biosciences, Inc. Insider Trading Activity

Rhea-AI Filing Summary

IDEAYA Biosciences (IDYA) Director Jeffrey Stein received a new stock option grant on June 24, 2025. The grant consists of 20,000 stock options with an exercise price of $21.78 per share.

Key details of the option grant:

• Expiration date: June 24, 2035
• Vesting schedule: 100% vests on earlier of (i) first anniversary of grant date or (ii) immediately before next Annual Meeting
• Vesting contingent on continued Board service

This Form 4 filing, signed by Attorney-in-Fact Andres Ruiz Briseno on June 26, 2025, represents standard equity compensation for non-employee director service. The grant aligns the director's interests with shareholders through long-term equity ownership.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Stein Jeffrey

(Last) (First) (Middle)

C/O IDEAYA BIOSCIENCES, INC.

5000 SHORELINE COURT, SUITE 300

(Street)

SOUTH SAN FRANCISCO CA 94080

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
IDEAYA Biosciences, Inc. [ IDYA ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
06/24/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Stock Option (right to buy)	$21.78	06/24/2025		A		20,000		(1)	06/24/2035	Common Stock	20,000	$0	20,000	D

Explanation of Responses:

1. 100% of the shares subject to the option shall vest in full on the earlier of (i) the first anniversary of the date of grant and (ii) immediately prior to the Annual Meeting following the date of grant, subject to the Reporting Person continuing in service on the Board through such vesting date.

	/s/ Andres Ruiz Briseno, as Attorney-in-Fact for Jeffrey Stein	06/26/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What stock options did IDYA director Jeffrey Stein receive on June 24, 2025?

Jeffrey Stein received 20,000 stock options with an exercise price of $21.78 per share. These options were granted on June 24, 2025, and will expire on June 24, 2035.

What are the vesting terms for Jeffrey Stein's IDYA stock options granted in June 2025?

The stock options will vest 100% on the earlier of: (i) the first anniversary of the grant date (June 24, 2026) or (ii) immediately prior to the next Annual Meeting following the grant date. Vesting is subject to Stein continuing his service on the Board through the vesting date.

Who filed the Form 4 for IDYA director Jeffrey Stein?

The Form 4 was signed by Andres Ruiz Briseno, acting as Attorney-in-Fact for Jeffrey Stein, on June 26, 2025.

What position does Jeffrey Stein hold at IDYA Biosciences?

According to the Form 4 filing, Jeffrey Stein serves as a Director on the Board of IDEAYA Biosciences, Inc. (IDYA).

How many IDYA shares could Jeffrey Stein acquire through the June 2025 option grant?

Through this stock option grant, Jeffrey Stein has the right to buy 20,000 shares of IDYA common stock at an exercise price of $21.78 per share.