Grayscale Bitcoin Mini Trust ETF Changes Index Price for Bitcoin Valuation

Effective April 1, 2026, Grayscale Bitcoin Mini Trust ETF will change the index price used for valuing its Bitcoin holdings for operational purposes. The Trust will transition from using the CoinDesk Bitcoin Price Index (XBX) to the CoinDesk Bitcoin Benchmark Rate. This change impacts the calculation of the Trust's Net Asset Value (NAV) and NAV per Share. The CoinDesk Bitcoin Benchmark Rate utilizes data from various digital asset trading platforms, including Binance, Bitstamp, Bybit, and others, selected based on criteria such as market quality, security, legal compliance, and data transparency. The methodology for calculating the Index Price involves volume weighting, FX conversion, outlier detection, inactivity adjustments, and manipulation resistance to ensure a reliable valuation. In instances where the primary index becomes unavailable, a cascading set of backup procedures, including the use of a secondary index from Coin Metrics and a tertiary option from the Trust's principal market, will be employed. The Sponsor retains discretion in determining the Index Price, with provisions for manual intervention in extreme circumstances and the ability to change index providers or methodologies if necessary, subject to SEC filings.