---
schema_version: "secwatch.filing_event.v1"
accession: "0001193125-26-108384"
form_type: "8-K"
ticker: "BTC"
cik: "0002015034"
company_name: "Grayscale Bitcoin Mini Trust ETF"
filed_at: "2026-03-16T23:59:59+00:00"
generated_at: "2026-05-15T11:59:08.960226+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# Grayscale Bitcoin Mini Trust ETF to adopt CoinDesk Bitcoin Benchmark Rate for NAV effective April 1, 2026

## Summary
- As of April 1, 2026, Trust will value Bitcoin holdings using the CoinDesk Bitcoin Benchmark Rate, replacing the CoinDesk Bitcoin Price Index (XBX).
- The new index aggregates trade data from 11 licensed platforms including Binance, Kraken, Gemini, and Crypto.com.
- If the benchmark is unavailable, the Sponsor uses a cascading fallback: Coin Metrics Secondary Index, then a principal market price, then a good-faith estimate.
- The Sponsor believes the new methodology provides a more accurate picture of Bitcoin price movements and reduces impact of anomalous trading.

## SEC filing metadata
- accession: 0001193125-26-108384
- form_type: 8-K
- ticker: BTC
- cik: 0002015034
- company_name: Grayscale Bitcoin Mini Trust ETF
- filed_at: 2026-03-16T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 8.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/2015034/000119312526108384/0001193125-26-108384-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/2015034/000119312526108384/btc-20260316.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001193125-26-108384
- JSON: https://secwatch.observer/filing/0001193125-26-108384.json
- Plain text: https://secwatch.observer/filing/0001193125-26-108384.txt

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