BlackRock's latest 13F filing for the first quarter of 2025 shows a significant increase in its holdings of Bitcoin-related assets. The report indicates that the company has invested a total of $5.43 billion in Bitcoin spot ETFs and stocks related to Bitcoin treasury and mining operations. This figure represents a substantial increase compared to the fourth quarter of 2024, reflecting growing institutional confidence in cryptocurrencies. Notably, BlackRock's flagship Bitcoin spot ETF, IBIT, saw its holdings rise from 2.6 million shares to 5.85 million shares, valued at $273.9 million. Additionally, BlackRock opened a new position in Fidelity's FBTC for the first time, currently holding 70,971 shares valued at $5.1 million. At the same time, it has established smaller positions in Grayscale's GBTC and GBTC Mini.