Asset managers, ranging from wealth management companies to hedge funds and pension funds, boosted allocations to U.S. exchange-traded funds tied to the price of bitcoin in the fourth quarter of 2024, as the price of the world's largest cryptocurrency soared 47%, according to recent regulatory filings. The State of Wisconsin Investment Board disclosed in its quarterly 13-F filings with the Securities and Exchange Commission that its bitcoin ETF holdings more than doubled in the final three months of last year, to 6 million shares of the iShares Bitcoin Trust ETF by December 31. The fund, which was the first fund of its kind to report investing in crypto following the debut of bitcoin ETFs, couldn't immediately be reached for comment.