Jeffrey Stein - 02 Mar 2026 Form 4 Insider Report for IDEAYA Biosciences, Inc. (IDYA)

Role: Director
Signature: /s/ Douglas Snyder, as Attorney-in-Fact for Jeffrey Stein
Issuer symbol: IDYA
Transactions as of: 02 Mar 2026
Net transactions value: +$1,647,890
Form type: 4
Filing time: 02 Mar 2026, 19:18:09 UTC
Previous filing: 07 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Stein Jeffrey	Director	C/O IDEAYA BIOSCIENCES, INC., 5000 SHORELINE COURT, SUITE 300, SOUTH SAN FRANCISCO	/s/ Douglas Snyder, as Attorney-in-Fact for Jeffrey Stein	02 Mar 2026	0001478831

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	IDYA	Common Stock	Purchase	$1,647,890	+50,000	+1168%	$32.96	54,281	02 Mar 2026	Direct	F1
holding	IDYA	Common Stock						3,363	02 Mar 2026	By Son
holding	IDYA	Common Stock						3,363	02 Mar 2026	By Son

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	This transaction was executed in multiple trades in prices ranging from $32.743 to $33.1999, inclusive. The price reported in Column 4 above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares purchased at each respective price within the range set forth in this footnote.

Content

This transaction was executed in multiple trades in prices ranging from $32.743 to $33.1999, inclusive. The price reported in Column 4 above reflects the weighted average purchase price. The Reporting Person hereby undertakes to provide to the Securities and Exchange Commission staff, the Issuer, or a security holder of the Issuer, upon request, full information regarding the number of shares purchased at each respective price within the range set forth in this footnote.