Grayscale Bitcoin Trust (GBTC), converted to a spot Bitcoin ETF on January 11, 2024, holds 291,260 BTC as of April 30, 2025, valued at $24.47 billion at $84,000/BTC. It is managed by Grayscale Investments, listed on NYSE Arca with a 1.5% management fee, and uses Coinbase Custody for Bitcoin storage.