BlackRock's iShares Bitcoin Trust (IBIT) has reached $72.7 billion in assets under management (AUM) as of June 10, 2025, marking one of the fastest growth rates for an ETF in U.S. history. The fund, launched in January 2024, achieved this milestone in just 341 trading days, surpassing the growth of other major ETFs like SPDR Gold Shares. This rapid expansion was fueled by the addition of 3,005 Bitcoins, valued at approximately $336 million, despite a $430.8 million outflow in May.The ETF's share price recently peaked at $63, delivering a 150% return since its inception. The surge in Bitcoin prices and strong institutional demand have been key drivers of IBIT's growth, with U.S. spot Bitcoin ETFs approaching $1 trillion in trading volume.