{"schema_version":"secwatch.filing_event.v1","accession":"0001213900-26-093966","form_type":"8-K","ticker":"ARKB","cik":"0001869699","company_name":"Ark 21Shares Bitcoin ETF","filed_at":"2026-08-26T20:11:51+00:00","discovered_at":"2026-08-26T20:13:01.432305+00:00","generated_at":"2026-08-26T20:13:06.202816+00:00","sec_items":["1.01","5.03","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.4,"calibrated_materiality_score":0.4,"confidence":"high","headline":"ARK 21Shares Bitcoin ETF switches benchmark to FTSE Bitcoin Index, changes sponsor fee timing","bullets":["Effective Aug 27, 2026, Trust will value shares and calculate NAV using FTSE Bitcoin Index, replacing CME CF Bitcoin Reference Rate - NY Variant.","Sponsor fee payment changes from weekly to at least quarterly in arrears, payable in bitcoin, per Amendment No. 1 to Sponsor Agreement.","Second Amended and Restated Trust Agreement dated Aug 26, 2026 reflects benchmark change and fee timing; other changes ministerial.","Benchmark Licensing Agreement with FTSE International Limited dated Aug 20, 2026; one-year initial term, auto-renewal.","Prior notice of termination of CF Benchmarks license given June 30, 2026, effective Aug 31, 2026."],"urls":{"canonical":"https://secwatch.observer/filing/0001213900-26-093966","json":"https://secwatch.observer/filing/0001213900-26-093966.json","markdown":"https://secwatch.observer/filing/0001213900-26-093966.md","text":"https://secwatch.observer/filing/0001213900-26-093966.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1869699/000121390026093966/0001213900-26-093966-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1869699/000121390026093966/ea0303132-8k_ark21shares.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-08-26T20:13:06.202816+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}