• Kevin Tang, a 10% owner of Boundless Bio, purchased 21,640 common shares through indirect ownership.
• The purchases increased reported beneficial ownership to 3,011,749 common shares.
• Reported purchase prices were $2.4 for 5,800 shares and $2.38 for the remaining 15,840 shares.

Disclaimer: This news brief was created by Public Technologies (PUBT) using generative artificial intelligence. While PUBT strives to provide accurate and timely information, this AI-generated content is for informational purposes only and should not be interpreted as financial, investment, or legal advice. Boundless Bio Inc. published the original content used to generate this news brief via EDGAR, the Electronic Data Gathering, Analysis, and Retrieval system operated by the U.S. Securities and Exchange Commission (Ref. ID: 0001178579-26-000020), on October 26, 2026, and is solely responsible for the information contained therein.