As of the week ending May 24, U.S. spot bitcoin ETFs posted their highest weekly trading volume of 2025, with $25 billion in turnover and $2.75 billion in net inflows — the second-largest weekly inflow since their launch in early 2024. BlackRock’s IBIT now holds 3.3% of the global bitcoin supply, roughly triple that of the second-largest fund, Fidelity’s FBTC. Spot Ethereum ETFs also saw net inflows of approximately $250 million, the highest since early February.