TechFlame News: According to market sources, Abu Dhabi's sovereign wealth fund Mubadala disclosed in its 13F filing with the U.S. Securities and Exchange Commission that it held 12,702,323 shares of BlackRock's iShares Bitcoin Trust (IBIT) as of the end of the fourth quarter of 2025, valued at approximately $630.6 million. This represents a 46% increase from the 8.7 million shares held at the end of the third quarter.