{"filing":{"accession_number":"0001104659-26-107800","cik":"0001649373","ticker":null,"company_name":"SANTANDER UK GROUP HOLDINGS PLC","form":"6-K","filing_date":"2026-09-15","report_date":"2026-09-15","primary_document":"tm2622973d4_6k.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1649373/000110465926107800/tm2622973d4_6k.htm"},"events":[{"id":33554,"run_id":30855,"accession_number":"0001104659-26-107800","anchor_item_number":null,"event_type":"debt_issuance","event_domain":"financial","is_material":true,"confidence":0.85,"summary":"The 6-K furnishes a Thirteenth Supplemental Indenture dated September 15, 2026, between Santander UK Group Holdings plc and Citibank, N.A., as trustee. A supplemental indenture is a document that amends or supplements an existing debt instrument, indicating the creation or modification of a direct financial obligation. The inclusion of legal opinions from counsel further supports that this is a material debt transaction requiring SEC disclosure.","company_name":"SANTANDER UK GROUP HOLDINGS PLC","ticker":null,"filing_date":"2026-09-15","form":"6-K","submitted_at":null,"items":null}],"classifications":[{"id":37029,"accession_number":"0001104659-26-107800","item_number":null,"item_title":null,"event_type":"debt_issuance","event_domain":"financial","is_material":true,"confidence":0.85,"reasoning":"The 6-K furnishes a Thirteenth Supplemental Indenture dated September 15, 2026, between Santander UK Group Holdings plc and Citibank, N.A., as trustee. A supplemental indenture is a document that amends or supplements an existing debt instrument, indicating the creation or modification of a direct financial obligation. The inclusion of legal opinions from counsel further supports that this is a material debt transaction requiring SEC disclosure.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-09-15T15:09:38.103735+00:00","company_name":"SANTANDER UK GROUP HOLDINGS PLC","ticker":null,"filing_date":"2026-09-15"}]}