Kristina M. Burow. - 23 Jun 2025 Form 4 Insider Report for Boundless Bio, Inc. (BOLD)

Role: Director, 10%+ Owner
Signature: /s/ Jessica Oien, Attorney-in-Fact for Kristina Burow
Issuer symbol: BOLD
Transactions as of: 23 Jun 2025
Net transactions value: $0
Form type: 4
Filing time: 23 Jun 2025, 17:11:29 UTC
Previous filing: 30 May 2025
Next filing: 29 Oct 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
Burow Kristina	Director, 10%+ Owner	C/O BOUNDLESS BIO, INC., 10955 ALEXANDRIA WAY, SUITE 100, SAN DIEGO	/s/ Jessica Oien, Attorney-in-Fact for Kristina Burow	23 Jun 2025	0001569248

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	+16,000		$0.000000	16,000	23 Jun 2025	Common Stock	16,000	$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.