Riot Platforms, the third largest bitcoin miner on Wall Street, has significantly increased its stake in rival Bitfarms Ltd. According to regulatory filings, Riot bought an additional 1 million shares of Bitfarms common stock through the open market. The transaction is worth about 2.28 million dollars. Riot's total holdings in Bitfarms increased from 84.30 million shares to 85.30 million shares. Through this acquisition, Riot now owns 18.9% of Bitfarms.