According to K33 Research data, 9 US spot Bitcoin ETFs (excluding GBTC) currently hold a total of 109,221 BTC (about $4 billion). BlackRock Bitcoin Spot ETF (IBIT) leads with 40,213 BTC, followed by Fidelity Bitcoin Spot ETF (FBTC), which holds 34,152 BTC.

In addition, Coinglass data shows that after GBTC was converted into a spot ETF during the same period, its holdings fell from 619,220 BTC to 552,680 BTC, a drop of more than 10%.