{"url_path":"/sec/bold/10-q/2026/item-6","section_key":"item-6","section_title":"Item 6 Exhibits.","topic":"sec","document":{"doc_type":"10-Q","doc_date":"2026-05-08","source_url":"https://www.sec.gov/Archives/edgar/data/1782303/0001193125-26-213321-index.html","accession_number":"0001193125-26-213321","cik":"0001782303","ticker":"BOLD","issuer_name":"Boundless Bio, Inc.","edgar_url":"https://www.sec.gov/Archives/edgar/data/1782303/0001193125-26-213321-index.html","primary_entity_key":"0001782303","primary_entity_name":"Boundless Bio, Inc."},"word_count":344,"has_tables":true,"body_markdown":"Item 6. Exhibits.\n\n \n\nExhibit\n\nIncorporated by Reference\n\nFiled\n\nNumber\n\nDescription\n\nForm\n\nDate\n\nNumber\n\nHerewith\n\n3.1\n\n \n\n[Amended and Restated Certificate of Incorporation](https://www.sec.gov/Archives/edgar/data/1782303/000119312524084736/d796750dex31.htm)\n\n8-K\n\n4/2/2024\n\n3.1\n\n \n\n3.2\n\n \n\n[Amended and Restated Bylaws](https://www.sec.gov/Archives/edgar/data/1782303/000119312524084736/d796750dex32.htm)\n\n8-K\n\n4/2/2024\n\n3.2\n\n \n\n10.1#\n\n \n\n[Non-Employee Director Compensation Program (as amended and restated effective March 6, 2026)](bold-ex10_1.htm)\n\n \n\n \n\n \n\nX\n\n10.2\n\n \n\n[Agreement for Termination of Lease and Voluntary Surrender of Premises, dated April 13, 2026, between ARE-10933 North Torrey Pines, LLC and Boundless Bio, Inc.](bold-ex10_2.htm)\n\n \n\n \n\n \n\nX\n\n31.1\n\n[Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.](bold-ex31_1.htm)\n\nX\n\n31.2\n\n[Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.](bold-ex31_2.htm)\n\nX\n\n32.1*\n\n[Certifications of Principal Executive Officer and Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.](bold-ex32_1.htm)\n\nX\n\n101.INS\n\nInline XBRL Instance Document – the instance document does not appear in the Interactive Data File because XBRL tags are embedded within the Inline XBRL document.\n\nX\n\n101.SCH\n\nInline XBRL Taxonomy Extension Schema With Embedded Linkbase Documents\n\nX\n\n104\n\nCover Page Interactive Data File (embedded within the Inline XBRL document)\n\nX\n\n \n\n \n\n# Indicates management contract or compensatory plan.\n\n* These certifications are deemed not filed for purposes of Section 18 of the Exchange Act or otherwise subject to the liability of that section, nor shall they be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act.\n\n27\n\n \n\nSIGNATURES\n\nPursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.\n\n \n\nBoundless Bio, Inc.\n\nDate: May 8, 2026\n\nBy:\n\n/s/ Zachary D. Hornby\n\nZachary D. Hornby\n\nPresident and Chief Executive Officer\n\n \n\n \n\n \n\n(Principal Executive Officer)\n\n \n\nDate: May 8, 2026\n\nBy:\n\n/s/ David Hinkle\n\nDavid Hinkle\n\nSenior Vice President, Finance, Controller and Treasurer\n\n \n\n \n\n \n\n(Principal Financial and Accounting Officer)\n\n \n\n \n\n \n\n28"}