BlackRock’s iShares Bitcoin Trust (IBIT), the leading spot Bitcoin ETF, has recently expanded its Bitcoin portfolio to hold approximately 631,962 BTC, with a current valuation exceeding $65 billion as of mid-May 2025. This marks a significant increase from earlier holdings reported at around 620,000 BTC, reflecting BlackRock’s aggressive accumulation strategy in the Bitcoin spot market.
The ETF has maintained a robust inflow momentum throughout 2025, with nearly $7 billion in net inflows recorded in the year so far, including substantial daily purchases averaging thousands of BTC. For instance, on May 5 alone, IBIT acquired over 5,600 Bitcoin valued at more than $529 million, contributing to its growing dominance in the Bitcoin ETF space.
BlackRock’s IBIT now commands a substantial share of the spot Bitcoin ETF market, controlling about 3% of the total Bitcoin supply and ranking as one of the largest ETFs globally by assets under management. This accumulation trend underscores institutional confidence in Bitcoin as an asset class, even amid broader market fluctuations and Federal Reserve bond purchases that have injected liquidity into financial markets.
The sustained inflows into BlackRock’s Bitcoin ETF have provided what analysts describe as “structural support” for Bitcoin’s price, helping the cryptocurrency maintain strength and recover from recent volatility. This institutional backing contrasts with other Bitcoin ETFs, which have experienced outflows or minimal inflows during the same period.
In summary, BlackRock’s spot Bitcoin ETF continues to lead the market by expanding its Bitcoin holdings aggressively, now controlling over 630,000 BTC worth more than $65 billion, reinforcing its position as a key player in the digital asset investment landscape.
