{"schema_version":"secwatch.filing_event.v1","accession":"0001213900-24-077941","form_type":"8-K","ticker":"ARKB","cik":"0001869699","company_name":"Ark 21Shares Bitcoin ETF","filed_at":"2024-09-12T23:59:59+00:00","discovered_at":"2026-05-14T18:03:15.032503+00:00","generated_at":"2026-05-31T05:18:22.425121+00:00","sec_items":["1.01","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.5,"calibrated_materiality_score":0.5,"confidence":"high","headline":"ARK 21Shares Bitcoin ETF adds BitGo and Anchorage as custodians for bitcoin holdings","bullets":["Trust entered custodial agreements with BitGo and Anchorage effective Sept 11, 2024, for one-year initial term.","Custodians will hold segregated accounts for trust's bitcoin; allocation among Coinbase, BitGo, Anchorage at sponsor's discretion.","Sponsor will not disclose allocation percentages and may change at any time without notice to shareholders.","Transfer fees between custodians borne by sponsor, not by trust or shareholders.","Existing Coinbase custody arrangement unaffected; sponsor expects to use all three custodians."],"urls":{"canonical":"https://secwatch.observer/filing/0001213900-24-077941","json":"https://secwatch.observer/filing/0001213900-24-077941.json","markdown":"https://secwatch.observer/filing/0001213900-24-077941.md","text":"https://secwatch.observer/filing/0001213900-24-077941.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1869699/000121390024077941/0001213900-24-077941-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1869699/000121390024077941/ea0213674-8k_ark21.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-31T05:18:22.425121+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"}