Abu Dhabi sovereign wealth fund Mubadala reveals holding over $400 million worth of BlackRock spot Bitcoin ETF According to Bitcoin Magazine, the latest 13F filing from Abu Dhabi sovereign wealth fund Mubadala shows that its holdings of BlackRock spot Bitcoin ETF (IBIT) have increased to 8.727 million shares, with a market value of $408.5 million, an increase of 6% from the end of 2024.