BlackRock has restructured its cryptocurrency portfolio, reducing its Ethereum holdings by 115,950 ETH, valued at over $913 million, as of September 12, 2025. This adjustment decreased Ethereum's share in BlackRock's crypto exposure from 16.7% to 15.7%. Simultaneously, BlackRock increased its Bitcoin holdings by 3,930 BTC, raising its position to 751,400 BTC, worth more than $2.09 billion. This move increased Bitcoin's dominance in the portfolio from 83.2% to 84.4%. The overall value of BlackRock's crypto assets rose to $101.53 billion, bolstered by Bitcoin's 1.97% rally and gains in smaller positions.