{"filing":{"accession_number":"0001193125-26-374787","cik":"0001782303","ticker":"BOLD","company_name":"Boundless Bio, Inc.","form":"8-K","filing_date":"2026-08-28","report_date":"2026-08-28","primary_document":"d111273d8k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1782303/000119312526374787/d111273d8k.htm"},"events":[{"id":30424,"run_id":27883,"accession_number":"0001193125-26-374787","anchor_item_number":"1.01","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"summary":"This Item 1.01 discloses Amendment No. 1 to the Merger Agreement between Boundless Bio, Merger Sub, and Serapha Bio, dated August 28, 2026. The amendment modifies key terms of a previously announced merger transaction, including treatment of Serapha RSUs, issuance of pre-funded warrants as merger consideration, and voting standards for share authorization. This is a material amendment to an ongoing M\u0026A transaction that would materially affect the terms and consideration structure of the contemplated merger.","company_name":"Boundless Bio, Inc.","ticker":"BOLD","filing_date":"2026-08-28","form":"8-K","submitted_at":null,"items":[{"id":33005,"accession_number":"0001193125-26-374787","item_number":"1.01","item_title":null,"event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"This Item 1.01 discloses Amendment No. 1 to the Merger Agreement between Boundless Bio, Merger Sub, and Serapha Bio, dated August 28, 2026. The amendment modifies key terms of a previously announced merger transaction, including treatment of Serapha RSUs, issuance of pre-funded warrants as merger consideration, and voting standards for share authorization. This is a material amendment to an ongoing M\u0026A transaction that would materially affect the terms and consideration structure of the contemplated merger.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-28T21:26:42.814365+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":33005,"accession_number":"0001193125-26-374787","item_number":"1.01","item_title":null,"event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.95,"reasoning":"This Item 1.01 discloses Amendment No. 1 to the Merger Agreement between Boundless Bio, Merger Sub, and Serapha Bio, dated August 28, 2026. The amendment modifies key terms of a previously announced merger transaction, including treatment of Serapha RSUs, issuance of pre-funded warrants as merger consideration, and voting standards for share authorization. This is a material amendment to an ongoing M\u0026A transaction that would materially affect the terms and consideration structure of the contemplated merger.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-28T21:26:42.814365+00:00","company_name":"Boundless Bio, Inc.","ticker":"BOLD","filing_date":"2026-08-28"}]}