{"filing":{"accession_number":"0000947484-26-000111","cik":"0000947484","ticker":"ACGLO","company_name":"ARCH CAPITAL GROUP LTD.","form":"8-K","filing_date":"2026-06-09","report_date":null,"primary_document":"acgl-20260609.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/947484/000094748426000111/acgl-20260609.htm"},"events":[{"id":5847,"run_id":5127,"accession_number":"0000947484-26-000111","anchor_item_number":"1.01","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.75,"summary":"Arch Capital completed a public offering of $2.0 billion in senior notes ($600M due 2036 at 5.250% and $1.4B due 2056 at 5.950%), constituting a material financing transaction and entry into a definitive agreement (Third Supplemental Indenture dated June 9, 2026). This material capital-raising event affects the company's capital structure and financial position.","company_name":"ARCH CAPITAL GROUP LTD.","ticker":"ACGLO","filing_date":"2026-06-09","form":"8-K","submitted_at":null,"items":[{"id":5612,"accession_number":"0000947484-26-000111","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"Arch Capital completed a public offering of $2.0 billion in senior notes ($600M due 2036 at 5.250% and $1.4B due 2056 at 5.950%), which constitutes a material financing transaction and entry into a definitive agreement (the Third Supplemental Indenture dated June 9, 2026). While this is primarily a debt issuance rather than a traditional M\u0026A transaction, it represents a material capital-raising event that would affect investor assessment of the company's capital structure and financial position. The Item 1.01 classification and the magnitude of the offering ($2B) confirm materiality.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T21:00:18.935685+00:00","company_name":"","ticker":null,"filing_date":""},{"id":5613,"accession_number":"0000947484-26-000111","item_number":"2.03","item_title":"Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement.","event_type":"other_material","event_domain":"catchall","is_material":true,"confidence":0.45,"reasoning":"Item 2.03 discloses creation of a direct financial obligation by incorporating Item 1.01 by reference. Without access to Item 1.01 content, the specific nature of the obligation cannot be determined. This could represent M\u0026A activity, debt issuance, or another material transaction. Given the cross-reference structure and the materiality threshold of Item 2.03 filings, this is classified as material but the specific event type remains ambiguous.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T21:00:18.935685+00:00","company_name":"","ticker":null,"filing_date":""},{"id":5614,"accession_number":"0000947484-26-000111","item_number":"8.01","item_title":"Other Events.","event_type":"other_material","event_domain":"catchall","is_material":false,"confidence":0.85,"reasoning":"This disclosure concerns the filing of legal opinions (Exhibits 5.1 and 5.2) in connection with a Notes offering. While the underlying Notes offering may be material, this Item 8.01 entry is a routine procedural disclosure about the attachment of standard legal documentation required for debt offerings. It does not itself constitute a material event—it is administrative in nature and does not convey substantive information about the offering terms, pricing, or financial impact.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T21:00:18.935685+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":5612,"accession_number":"0000947484-26-000111","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"ma_activity","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"Arch Capital completed a public offering of $2.0 billion in senior notes ($600M due 2036 at 5.250% and $1.4B due 2056 at 5.950%), which constitutes a material financing transaction and entry into a definitive agreement (the Third Supplemental Indenture dated June 9, 2026). While this is primarily a debt issuance rather than a traditional M\u0026A transaction, it represents a material capital-raising event that would affect investor assessment of the company's capital structure and financial position. The Item 1.01 classification and the magnitude of the offering ($2B) confirm materiality.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T21:00:18.935685+00:00","company_name":"ARCH CAPITAL GROUP LTD.","ticker":"ACGLO","filing_date":"2026-06-09"},{"id":5613,"accession_number":"0000947484-26-000111","item_number":"2.03","item_title":"Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement.","event_type":"other_material","event_domain":"catchall","is_material":true,"confidence":0.45,"reasoning":"Item 2.03 discloses creation of a direct financial obligation by incorporating Item 1.01 by reference. Without access to Item 1.01 content, the specific nature of the obligation cannot be determined. This could represent M\u0026A activity, debt issuance, or another material transaction. Given the cross-reference structure and the materiality threshold of Item 2.03 filings, this is classified as material but the specific event type remains ambiguous.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T21:00:18.935685+00:00","company_name":"ARCH CAPITAL GROUP LTD.","ticker":"ACGLO","filing_date":"2026-06-09"},{"id":5614,"accession_number":"0000947484-26-000111","item_number":"8.01","item_title":"Other Events.","event_type":"other_material","event_domain":"catchall","is_material":false,"confidence":0.85,"reasoning":"This disclosure concerns the filing of legal opinions (Exhibits 5.1 and 5.2) in connection with a Notes offering. While the underlying Notes offering may be material, this Item 8.01 entry is a routine procedural disclosure about the attachment of standard legal documentation required for debt offerings. It does not itself constitute a material event—it is administrative in nature and does not convey substantive information about the offering terms, pricing, or financial impact.","classifier_version":"claude-haiku-4-5-20251001+prompt-9e0ffca5","taxonomy_version":"v1","classified_at":"2026-06-09T21:00:18.935685+00:00","company_name":"ARCH CAPITAL GROUP LTD.","ticker":"ACGLO","filing_date":"2026-06-09"}]}