According to online reports, according to data from the 13F document filed by institutions with the U.S. Securities and Exchange Commission (SEC), the size of spot Bitcoin ETFs held by large institutions such as pensions or hedge funds tripled in the fourth quarter of 2024. As of Q4 2024, institutional investors hold $38.7 billion worth of spot Bitcoin ETFs. That's more than three times that of Q3, which reported a stake of just $12.4 billion. Among them, the Wisconsin Investment Board increased its holdings of BlackRock's iShares Bitcoin Trust (IBIT) shares to just over 6 million shares. Billionaire hedge fund investor Paul Tudor also nearly doubled his stake in IBIT from 4,428,230 shares to 8,048,552 shares. Eric Balchunas, senior ETF analyst at Bloomberg Intelligence, said that IBIT currently has 1,100 institutional holders declaring their shareholding through 13F documents. Most newly launched ETFs typically have fewer than 10 institutional holders.