{"schema_version":"secwatch.filing_event.v1","accession":"0001213900-25-123286","form_type":"8-K","ticker":"ARKB","cik":"0001869699","company_name":"Ark 21Shares Bitcoin ETF","filed_at":"2025-12-18T23:59:59+00:00","discovered_at":"2026-05-14T18:02:40.929056+00:00","generated_at":"2026-05-16T12:47:06.792479+00:00","sec_items":["1.01","9.01"],"event_type":"other_material","sentiment":"positive","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"ARK 21Shares Bitcoin ETF adds BitGo as custodian and Macquarie as AP with in-kind creation","bullets":["Entered custodial services agreement with BitGo Trust Company to custody a portion of Trust's bitcoin starting Dec 12, 2025.","Will allocate bitcoin among existing custodians (Coinbase, Anchorage, BitGo New York) and BitGo; allocation not disclosed.","Sponsor bears transfer fees between custodians; on-chain transfers subject to Bitcoin network risks.","Entered authorized participant agreement with Macquarie Capital on Dec 16, 2025, allowing in-kind creation/redemption of baskets.","Transaction fees for creation/redemption may apply unless waived by sponsor."],"urls":{"canonical":"https://secwatch.observer/filing/0001213900-25-123286","json":"https://secwatch.observer/filing/0001213900-25-123286.json","markdown":"https://secwatch.observer/filing/0001213900-25-123286.md","text":"https://secwatch.observer/filing/0001213900-25-123286.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1869699/000121390025123286/0001213900-25-123286-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1869699/000121390025123286/ea0270186-8k_ark21share.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-05-16T12:47:06.792479+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":[{"claim_id":"97045289ad04502e79b825b15eda67a75b504670","claim":"Ark 21Shares Bitcoin ETF entered into Authorized Participant Agreement with Macquarie Capital (USA) Inc. (effective 2025-12-16).","evidence_excerpt":"On December 16, 2025, the Trust entered into a new authorized participant agreement (the “Authorized Participant Agreement”) with Macquarie Capital (USA) Inc. (“Macquarie”), pursuant to which Macquarie has agreed to act as an authorized participant of the Trust.","evidence_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1869699/000121390025123286/0001213900-25-123286-index.htm","confidence":0.9,"family_label":"Material Agreements","details":[{"label":"Action","value":"entry"},{"label":"Counterparty","value":"Macquarie Capital (USA) Inc."},{"label":"Effective","value":"2025-12-16"}],"fact_type":"material_agreement"},{"claim_id":"eef1b20fd9bfae32023fae12d423ec0afac57573","claim":"Ark 21Shares Bitcoin ETF entered into Custodial Services Agreement with BitGo Trust Company, Inc. (effective 2025-12-12).","evidence_excerpt":"On December 12, 2025, ARK 21Shares Bitcoin ETF (the “Trust”) entered into a new custodial services agreement (the “Custodial Services Agreement”) with BitGo Trust Company, Inc., a South Dakota trust company (“BitGo”).","evidence_source":"SEC 8-K Item 1.01/1.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1869699/000121390025123286/0001213900-25-123286-index.htm","confidence":0.9,"family_label":"Material Agreements","details":[{"label":"Action","value":"entry"},{"label":"Counterparty","value":"BitGo Trust Company, Inc."},{"label":"Effective","value":"2025-12-12"}],"fact_type":"material_agreement"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}