Jane Street Capital has revealed significant holdings in three major Bitcoin mining companies, leading to a surge in their stock prices. The firm disclosed a 5% stake in Hut 8, amounting to 5.3 million shares, a 5.4% stake in Bitfarms with 29.9 million shares, and a 5% stake in Cipher Mining, holding 19.6 million shares. Following the disclosure on October 23, Cipher Mining's stock jumped 19.9% to $20.69, Hut 8 increased by 15% to $46.82, and Bitfarms rose 10% to $4.77. Other mining stocks, including HIVE Digital and Bitdeer, also experienced gains of over 15% and 7%, respectively.