Christine Brennan - Jun 23, 2025 Form 4 Insider Report for Boundless Bio, Inc. (BOLD)

Role: Director
Signature: /s/ Jessica Oien, Attorney-in-Fact for Christine Brennan
Stock symbol: BOLD
Transactions as of: Jun 23, 2025
Transactions value $: $0
Form type: 4
Date filed: 6/23/2025, 05:21 PM
Previous filing: Mar 27, 2024
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Brennan Christine	Director	C/O BOUNDLESS BIO, INC., 10955 ALEXANDRIA WAY, SUITE 100, SAN DIEGO	/s/ Jessica Oien, Attorney-in-Fact for Christine Brennan	2025-06-23	0002016488

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	BOLD	Stock Option (right to buy)	Award	$0	+16K		$0.00	16K	Jun 23, 2025	Common Stock	16K	$1.03	Direct	F1

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

Explanation of Responses:

Id	Content
F1	The stock option shall vest in substantially equal monthly installments over the 12 months following June 23, 2025 (or, in the event the next annual meeting of the issuer's stockholders occurs prior to June 23, 2026, any remaining unvested portion of the stock option will vest on the date of such annual meeting), subject to the reporting person's continuing service on the issuer's board of directors through such vesting date.

Content

The stock option shall vest in substantially equal monthly installments over the 12 months following June 23, 2025 (or, in the event the next annual meeting of the issuer's stockholders occurs prior to June 23, 2026, any remaining unvested portion of the stock option will vest on the date of such annual meeting), subject to the reporting person's continuing service on the issuer's board of directors through such vesting date.