{"filing":{"accession_number":"0001213900-26-093966","cik":"0001869699","ticker":"ARKB","company_name":"Ark 21Shares Bitcoin ETF","form":"8-K","filing_date":"2026-08-26","report_date":"2026-08-20","primary_document":"ea0303132-8k_ark21shares.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1869699/000121390026093966/ea0303132-8k_ark21shares.htm"},"events":[{"id":29750,"run_id":27255,"accession_number":"0001213900-26-093966","anchor_item_number":"1.01","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"summary":"Ark 21Shares Bitcoin ETF entered into a Benchmark Licensing Agreement with FTSE to replace the terminated CME CF Bitcoin Reference Rate as the pricing benchmark for the ETF's net asset value calculation, effective August 27, 2026, and amended its Sponsor Agreement to change sponsor fee payment timing from weekly to quarterly in arrears. These operational changes are material to investors as the benchmark change directly affects how the ETF's shares are valued and priced.","company_name":"Ark 21Shares Bitcoin ETF","ticker":"ARKB","filing_date":"2026-08-26","form":"8-K","submitted_at":null,"items":[{"id":32133,"accession_number":"0001213900-26-093966","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"The filing discloses entry into two material definitive agreements: (1) a Benchmark Licensing Agreement with FTSE to replace the terminated CME CF Bitcoin Reference Rate as the pricing benchmark for the ETF's net asset value calculation, effective August 27, 2026, and (2) Amendment No. 1 to the Sponsor Agreement changing sponsor fee payment timing from weekly to quarterly in arrears. While these are contractual arrangements, they are operational/strategic in nature rather than fitting the specific financial or governance categories—the benchmark change is critical to the ETF's daily operations and valuation methodology, and the fee timing amendment is an administrative operational matter. This is material to investors as the benchmark change directly affects how the ETF's shares are valued and priced.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-26T20:14:08.280744+00:00","company_name":"","ticker":null,"filing_date":""}]},{"id":29751,"run_id":27255,"accession_number":"0001213900-26-093966","anchor_item_number":"5.03","event_type":"governance_other","event_domain":"governance","is_material":false,"confidence":0.85,"summary":"The Trust Agreement governing the ETF's operations was amended to include changes to the underlying index methodology, sponsor fee payment timing, and technical conforming revisions; the filing explicitly states these changes do not materially impact the rights of the Trust or holders of Shares.","company_name":"Ark 21Shares Bitcoin ETF","ticker":"ARKB","filing_date":"2026-08-26","form":"8-K","submitted_at":null,"items":[{"id":32134,"accession_number":"0001213900-26-093966","item_number":"5.03","item_title":"Amendments to Articles of Incorporation or Bylaws;","event_type":"governance_other","event_domain":"governance","is_material":false,"confidence":0.85,"reasoning":"This disclosure concerns amendments to the Trust Agreement governing the ETF's operations, including changes to the underlying index methodology, sponsor fee payment timing, and technical conforming revisions. The filing explicitly states that none of these changes \"materially impact the rights of the Trust or holders of Shares,\" indicating routine administrative governance updates rather than a material event affecting investor interests.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-26T20:14:08.280744+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":32133,"accession_number":"0001213900-26-093966","item_number":"1.01","item_title":"Entry into a Material Definitive Agreement.","event_type":"operational_other","event_domain":"operational","is_material":true,"confidence":0.75,"reasoning":"The filing discloses entry into two material definitive agreements: (1) a Benchmark Licensing Agreement with FTSE to replace the terminated CME CF Bitcoin Reference Rate as the pricing benchmark for the ETF's net asset value calculation, effective August 27, 2026, and (2) Amendment No. 1 to the Sponsor Agreement changing sponsor fee payment timing from weekly to quarterly in arrears. While these are contractual arrangements, they are operational/strategic in nature rather than fitting the specific financial or governance categories—the benchmark change is critical to the ETF's daily operations and valuation methodology, and the fee timing amendment is an administrative operational matter. This is material to investors as the benchmark change directly affects how the ETF's shares are valued and priced.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-26T20:14:08.280744+00:00","company_name":"Ark 21Shares Bitcoin ETF","ticker":"ARKB","filing_date":"2026-08-26"},{"id":32134,"accession_number":"0001213900-26-093966","item_number":"5.03","item_title":"Amendments to Articles of Incorporation or Bylaws;","event_type":"governance_other","event_domain":"governance","is_material":false,"confidence":0.85,"reasoning":"This disclosure concerns amendments to the Trust Agreement governing the ETF's operations, including changes to the underlying index methodology, sponsor fee payment timing, and technical conforming revisions. The filing explicitly states that none of these changes \"materially impact the rights of the Trust or holders of Shares,\" indicating routine administrative governance updates rather than a material event affecting investor interests.","classifier_version":"claude-haiku-4-5-20251001+prompt-a85dd512","taxonomy_version":"v1.3","classified_at":"2026-08-26T20:14:08.280744+00:00","company_name":"Ark 21Shares Bitcoin ETF","ticker":"ARKB","filing_date":"2026-08-26"}]}