US Spot Bitcoin ETFs Add 26,700 BTC in May, BlackRock’s IBIT Holds 631,962 BTC Worth $65B

U.S. spot Bitcoin exchange-traded funds (ETFs) have seen strong inflows in May 2025, acquiring 26,700 BTC so far this month, compared to just 7,200 BTC mined during the same period. Over the past week, spot Bitcoin ETFs attracted $604 million in net inflows, marking the fifth consecutive week of positive flows.

BlackRock’s IBIT added $129.7 million in a single day and now holds 631,962 BTC, valued at $65 billion as of mid-May, with IBIT’s share of U.S. Bitcoin ETF holdings at 53.6%. Total ETF holdings have reached $122 billion, and 14 million BTC are now considered illiquid. Binance holds 633,000 BTC, and Metaplanet has increased its holdings to 7,800 BTC.

Collectively, spot Bitcoin ETFs now hold over 1.26 million BTC, representing more than 6% of the total Bitcoin supply. Fidelity’s $FBTC recorded a $122 million outflow last week.

Digital asset funds recorded $785 million in inflows last week, bringing year-to-date totals to $7.5 billion and fully reversing outflows from February and March. Bitcoin led with $557 million in inflows, while Ethereum funds saw $205 million, supported by the recent Pectra upgrade and leadership changes at Ethereum.

Ethereum ETFs attracted $41.6 million in inflows last week, with BlackRock’s ETHA leading among Ethereum products. Solana recorded over $175 million in inflows over the past seven days, including more than $90 million transferred from Ethereum.

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