---
schema_version: "secwatch.filing_event.v1"
accession: "0000950170-25-089983"
form_type: "8-K"
ticker: "GBTC"
cik: "0001588489"
company_name: "Grayscale Bitcoin Trust ETF"
filed_at: "2025-06-25T23:59:59+00:00"
generated_at: "2026-05-18T19:22:30.730903+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.2
calibrated_materiality_score: 0.2
confidence: "high"
source: SEC EDGAR
---

# Grayscale Bitcoin Trust adds Bitfinex to CoinDesk Bitcoin Price Index

## Summary
- CoinDesk Indices added Bitfinex to the XBX index effective June 22, 2025.
- No trading platforms were removed in the scheduled quarterly review.
- Constituent platforms now: Coinbase, Kraken, Bitstamp, Crypto.com, LMAX Digital, Bullish, Bitfinex.
- Index Provider may change venues or calculation method at any time.

## SEC filing metadata
- accession: 0000950170-25-089983
- form_type: 8-K
- ticker: GBTC
- cik: 0001588489
- company_name: Grayscale Bitcoin Trust ETF
- filed_at: 2025-06-25T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.2
- calibrated_materiality_score: 0.2
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1588489/000095017025089983/0000950170-25-089983-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1588489/000095017025089983/gbtc-20250622.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000950170-25-089983
- JSON: https://secwatch.observer/filing/0000950170-25-089983.json
- Plain text: https://secwatch.observer/filing/0000950170-25-089983.txt

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