US Bitcoin, Ethereum ETFs Post $1 Billion Daily Inflows as BlackRock's IBIT Leads with $877 Million

U.S. spot Bitcoin and Ethereum exchange-traded funds (ETFs) have recorded their highest combined daily inflows since January, with over $1 billion entering the funds amid a surge in cryptocurrency prices.

On May 21, U.S. Bitcoin ETFs saw $608.99 million in net inflows and $7.64 billion in trading volume, the highest since February 2025. The following day, Bitcoin ETFs added $934.8 million, while Ethereum ETFs attracted $110.5 million in inflows.

BlackRock's iShares Bitcoin Trust (IBIT) led all U.S. ETFs in inflows, attracting $877.2 million on May 22, its largest single-day inflow for the month. IBIT has also become one of the top five ETFs for year-to-date flows and has narrowed the gap with the SPDR Gold Shares (GLD) ETF.

Bitcoin ETFs have experienced eight consecutive days of inflows, with $2.75 billion entering the funds over the past week. Cumulative net inflows into U.S. spot Bitcoin ETFs have now surpassed $44.5 billion, reaching an all-time high. In May alone, net flows into Bitcoin ETFs have exceeded $3.2 billion.

Ethereum ETFs have reported $248.2 million in inflows over the past week and $58.6 million in net inflows on May 23. BlackRock recently purchased $52.8 million worth of Ethereum for its ETF products.

Bitcoin ETF inflows have reached $42.7 billion, and CME futures open interest stands at $17 billion, below the December peak of $22.8 billion. BlackRock also bought 3,950 BTC recently.

The increase in ETF inflows follows Bitcoin's rally to a new all-time high above $110,000.

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