2M-option grant to Erasca, Inc. (ERAS) CEO Jonathan Lim

Rhea-AI Filing Summary

Erasca, Inc. Chairman, CEO and 10% owner Jonathan E. Lim reported receiving a stock option grant covering 2,000,000 shares of common stock. The option has an exercise price of $10.31 per share and is held directly.

According to the vesting terms, 1/48 of the option shares vest each month on the 29th (or the last day of February), beginning in February 2026, so long as Lim continues to provide service to Erasca on each vesting date. After this grant, he beneficially owns options for 2,000,000 shares.

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

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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^*

Lim Jonathan E

(Last) (First) (Middle)

C/O ERASCA, INC.

3115 MERRYFIELD ROW, SUITE 300

(Street)

SAN DIEGO CA 92121

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Erasca, Inc. [ ERAS ]

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

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

3. Date of Earliest Transaction (Month/Day/Year)
01/29/2026

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)	$10.31	01/29/2026		A		2,000,000		(1)	01/29/2036	Common Stock	2,000,000	$0	2,000,000	D

Explanation of Responses:

1. 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.

	/s/ Ebun Garner, Attorney-in-fact	01/30/2026
	** 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 insider transaction did Erasca (ERAS) report for Jonathan E. Lim?

Erasca reported that Chairman and CEO Jonathan E. Lim received a stock option grant for 2,000,000 shares of common stock at a $10.31 exercise price. The options are held directly and were granted as of January 29, 2026, according to the Form 4 filing.

What are the vesting terms of Jonathan Lim’s 2,000,000 Erasca stock options?

The 2,000,000 Erasca stock options vest in equal monthly installments, with 1/48 of the shares vesting each month. Vesting occurs on the 29th of each month (or last day of February) starting February 2026, conditioned on Lim’s continuous service.

What is the exercise price of Jonathan Lim’s Erasca stock option grant?

Jonathan Lim’s Erasca stock option grant has an exercise price of $10.31 per share. This is the price he must pay to purchase each share of common stock underlying the option once the respective option portion has vested and is exercisable.

How many Erasca derivative securities does Jonathan Lim own after this transaction?

Following this reported transaction, Jonathan Lim beneficially owns 2,000,000 derivative securities in the form of stock options. These options give him the right to buy 2,000,000 shares of Erasca common stock at the stated $10.31 exercise price, subject to vesting.

Is Jonathan E. Lim a major insider at Erasca (ERAS)?

Yes. The Form 4 lists Jonathan E. Lim as a Director, Chairman and CEO, and a 10% owner of Erasca. This combination of roles and ownership status identifies him as a key insider whose equity awards and holdings are closely tracked in regulatory filings.

What does this Erasca Form 4 filing indicate about compensation structure?

The filing indicates that Jonathan Lim’s compensation includes equity in the form of stock options, aligning his potential upside with Erasca’s share performance. The four-year style monthly vesting schedule encourages longer-term service and retention, conditioned on his continued role with the company.