BOLD · Quarterly Report (Form 10-Q) · Filed August 7, 2026

Boundless Bio Inc — 10-Q exhibit

bold-ex32_1.htm

EX-32.1

Exhibit 32.1

CERTIFICATIONS PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report on Form 10-Q of Boundless Bio, Inc. (the Company) for the quarter ended June 30, 2026 as filed with the Securities and Exchange Commission on the date hereof (the Report), Jessica Oien, President, Chief Legal Officer, and Corporate Secretary of the Company, and David Hinkle, Senior Vice President, Finance, Controller, and Treasurer of the Company, each hereby certifies, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to his or her knowledge, that:

The Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934, as amended; and

The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.


Date: August 7, 2026	By:	/s/ Jessica Oien
		Jessica Oien
		President, Chief Legal Officer, and Corporate Secretary
		(Principal Executive Officer)

Date: August 7, 2026	By:	/s/ David Hinkle
		David Hinkle
		Senior Vice President, Finance, Controller and Treasurer
		(Principal Financial and Accounting Officer)

The foregoing certifications are being furnished solely pursuant to 18 U.S.C. Section 1350 and are not being filed as part of the Report or as a separate disclosure document.

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