Odaily reports that according to 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), the assets under management (AUM) of spot Bitcoin ETFs held by large institutions such as pension funds or hedge funds doubled in the fourth quarter of 2024. As of Q4 2024, institutional investors held spot Bitcoin ETFs worth $38.7 billion. This figure is more than triple the $12.4 billion reported in Q3. Among them, the Wisconsin Investment Board increased its holdings of the BlackRock iShares Bitcoin Trust (IBIT) to slightly above 6 million shares. Billionaire hedge fund investor Paul Tudor also increased his IBIT holdings from 4,428,230 shares to 8,048,552 shares, an increase of nearly 100%. Bloomberg Intelligence senior ETF analyst Eric Balchunas said that IBIT currently has 1,100 institutional holders who have reported their holdings through 13F filings, while most newly launched ETFs typically have fewer than 10 institutional holders.