{"filing":{"accession_number":"0001104659-26-090712","cik":"0002015947","ticker":"SBXD-WT","company_name":"SilverBox Corp IV","form":"8-K","filing_date":"2026-08-05","report_date":"2026-08-04","primary_document":"tm2622195d1_8k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/2015947/000110465926090712/tm2622195d1_8k.htm"},"events":[{"id":24386,"run_id":22091,"accession_number":"0001104659-26-090712","anchor_item_number":"1.01","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.92,"summary":"The filing discloses entry into a Second Amendment to an existing Business Combination Agreement between SilverBox Corp IV (SPAC) and Parataxis Holdings LLC, extending the Outside Date deadline from August 6, 2026 to December 31, 2026. This is a material amendment to a previously disclosed business combination transaction (Item 1.01), affecting the timing and conditions of a proposed merger/change of control.","company_name":"SilverBox Corp IV","ticker":"SBXD-WT","filing_date":"2026-08-05","form":"8-K","submitted_at":null,"items":[{"id":24921,"accession_number":"0001104659-26-090712","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.92,"reasoning":"The filing discloses entry into a Second Amendment to an existing Business Combination Agreement between SilverBox Corp IV (SPAC) and Parataxis Holdings LLC, extending the Outside Date deadline from August 6, 2026 to December 31, 2026. This is a material amendment to a previously disclosed business combination transaction (Item 1.01), affecting the timing and conditions of a proposed merger/change of control.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-06T02:31:23.092399+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":24921,"accession_number":"0001104659-26-090712","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.92,"reasoning":"The filing discloses entry into a Second Amendment to an existing Business Combination Agreement between SilverBox Corp IV (SPAC) and Parataxis Holdings LLC, extending the Outside Date deadline from August 6, 2026 to December 31, 2026. This is a material amendment to a previously disclosed business combination transaction (Item 1.01), affecting the timing and conditions of a proposed merger/change of control.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-06T02:31:23.092399+00:00","company_name":"SilverBox Corp IV","ticker":"SBXD-WT","filing_date":"2026-08-05"}]}