Grayscale GBTC decreased its holdings by 4,130 BTC on March 8 and now holds 405,713 BTC ($27.93 billion worth). Fidelity increased its holdings by 6,974 BTC ($480.11 million) and now holds 122,952 BTC ($8.46 billion). Nine spot Bitcoin ETFs, including GBTC, added 8,179 BTC worth $563.09 million to their holdings.