---
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"
generated_at: "2026-05-31T05:18:22.425121+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.5
calibrated_materiality_score: 0.5
confidence: "high"
source: SEC EDGAR
---

# ARK 21Shares Bitcoin ETF adds BitGo and Anchorage as custodians for bitcoin holdings

## Summary
- 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.

## SEC filing metadata
- 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
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.5
- calibrated_materiality_score: 0.5
- confidence: high
- sec_items: 1.01, 9.01
- 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

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001213900-24-077941
- JSON: https://secwatch.observer/filing/0001213900-24-077941.json
- Plain text: https://secwatch.observer/filing/0001213900-24-077941.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.