U.S. spot Bitcoin exchange-traded funds (ETFs) have experienced a surge in inflows, attracting over $3.2 billion in net flows during May, the highest monthly total since January. Over the past week alone, Bitcoin ETFs drew more than $2.5 billion, with $934 million added in a single day, marking the seventh consecutive day of net inflows. Cumulative inflows into U.S. Bitcoin ETFs since their launch now exceed $44 billion.
BlackRock’s iShares Bitcoin Trust (IBIT) has led this momentum, recording the highest daily inflow among all ETFs with $877 million on Thursday. IBIT now holds 636,000 BTC, more than double all other U.S. spot Bitcoin ETFs combined, and has accumulated $45 billion in assets since its launch. The fund is ranked #8 among BlackRock’s 1,131 funds and has seen $8 billion in inflows over the last five weeks.
Bitcoin ETFs have seen $6.4 billion in inflows over the past month. The influx of institutional investment has coincided with Bitcoin reaching new all-time highs, crossing $110,000 and peaking at $112,000 before retreating slightly. The combined assets under management for all spot Bitcoin ETFs now stand at $127 billion.
While Bitcoin ETFs have seen strong and consistent inflows, spot Ethereum ETFs have experienced more modest activity. On May 23, Ethereum ETFs recorded a $110 million inflow, the largest since February 4, 2025. BlackRock was the only major institution with net inflows into Ethereum ETFs on some days, but these were offset by outflows from other providers such as Fidelity, which recorded a net inflow of nearly 16,000 ETH on May 23, while Bitwise added over 2,000 ETH.
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