CleanSpark, a U.S. cryptocurrency miner, boosted its Bitcoin holdings in December 2024, citing improved efficiency and a significant rise in hashrate. The company mined 668 BTC in December and 7,024 BTC throughout the year, with a 287.9% increase in hashrate year-over-year. CleanSpark's operating hashrate reached 39.1 exahashes per second by year-end. They sold 12.65 BTC in December, earning $1.28 million. By acquiring facilities in Knoxville, Tennessee, CleanSpark increased its mining capacity, becoming the fifth largest corporate Bitcoin holder with 9,952 BTC, surpassing Tesla.