Consent of Independent Registered Public Accounting Firm

We consent to the incorporation by reference in the registration statements (No. 333-278354) on Form S-8 and (No. 333-286302) on Form S-3 of our report dated March 9, 2026, with respect to the financial statements of Boundless Bio, Inc.

/s/ KPMG LLP

San Diego, California
March 9, 2026