Bitcoin rallied 37.6% from its Aug. 3 closing price of $63,520 to an intraday high of $87,395 49 days later, increasing its market value by $475 billion. Jim Cramer had said he would exit his entire position after IBM Chairman and CEO Arvind Krishna warned that quantum computers could threaten Bitcoin’s cryptography within three or four years. Bitcoin later traded near $85,500, leaving the gain from Cramer’s sell call at about 35%. The rally included more than $1 billion in crypto-derivatives liquidations on Sept. 21, including roughly $850 million in short positions, while broader drivers included forced short covering and improved risk appetite as oil prices and Treasury yields eased. The price increase does not establish whether Cramer sold any Bitcoin or invalidate the quantum-security concern, which remains focused on a potential 2029-2030 timeframe.