---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-25-236072"
form_type: "8-K"
ticker: "GBTC"
cik: "0001588489"
company_name: "Grayscale Bitcoin Trust ETF"
filed_at: "2025-10-09T23:59:59+00:00"
generated_at: "2026-05-17T04:11:35.064232+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.35
calibrated_materiality_score: 0.35
confidence: "medium"
source: SEC EDGAR
---

# Grayscale Bitcoin Trust enters new prime broker and admin agreements with Coinbase and BNY Mellon

## Summary
- On Oct 3, 2025, signed new Prime Broker Agreement with Coinbase, Inc., Coinbase Custody, and Coinbase Credit.
- On Oct 9, 2025, BNY Mellon became fund administrator under a new Fund Administration and Accounting Agreement.
- Previous prime broker agreement (Dec 29, 2023) and prior BNY admin agreement (Feb 26, 2024) were terminated on the respective effective dates.
- Coinbase Custody remains custodian; BNY continues providing admin/accounting services under new terms.

## SEC filing metadata
- accession: 0001193125-25-236072
- form_type: 8-K
- ticker: GBTC
- cik: 0001588489
- company_name: Grayscale Bitcoin Trust ETF
- filed_at: 2025-10-09T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.35
- calibrated_materiality_score: 0.35
- confidence: medium
- sec_items: 1.01, 1.02, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1588489/000119312525236072/0001193125-25-236072-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1588489/000119312525236072/gbtc-20251003.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-25-236072
- JSON: https://secwatch.observer/filing/0001193125-25-236072.json
- Plain text: https://secwatch.observer/filing/0001193125-25-236072.txt

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