David M. Chacko - 15 Dec 2025 Form 4 Insider Report for Erasca, Inc. (ERAS)

Role: CFO and CBO
Signature: /s/ Ebun Garner, Attorney-in-fact
Issuer symbol: ERAS
Transactions as of: 15 Dec 2025
Net transactions value: +$21,250
Form type: 4
Filing time: 30 Jan 2026, 09:04:03 UTC
Previous filing: 05 Feb 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Chacko David M.	CFO and CBO	C/O ERASCA, INC., 3115 MERRYFIELD ROW, SUITE 300, SAN DIEGO	/s/ Ebun Garner, Attorney-in-fact	30 Jan 2026	0001871801

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	ERAS	Common Stock	Other	$21,250	+17,793	+6.8%	$1.19	279,980	15 Dec 2025	Direct	F1, F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	ERAS	Stock option (right to buy)	Award	$0	+640,000		$0.000000	640,000	29 Jan 2026	Common Stock	640,000	$10.31	Direct	F3

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

Explanation of Responses:

Id	Content
F1	Shares purchased under the Company's 2021 Employee Stock Purchase Plan
F2	The purchase price was calculated in accordance with the issuer's 2021 Employee Stock Purchase Plan.
F3	1/48th of the shares subject to the option vest monthly on the 29th day of each month (or the last day of February), starting in February 2026, subject to the Reporting Person's continuous service to the issuer on each such vesting date.