BlackRock has significantly increased its Bitcoin holdings, purchasing approximately 5,000 BTC over the past two days. The investment firm acquired 4,310 BTC worth $288.8 million on October 15, followed by additional purchases bringing the total to $291 million. This brings BlackRock's total Bitcoin holdings to over $25 billion. Earlier, BlackRock bought $80 million in Bitcoin, and another purchase included 4344 BTC.