Top U.S. Bitcoin miners report strong May performance and infrastructure growth

Some of the largest U.S.-based Bitcoin miners—CleanSpark, MARA, and Riot Platforms—released their May 2025 operational updates today, reporting solid gains.

All three companies reported month-over-month gains in Bitcoin ( BTC ) production, infrastructure development, and strategic positioning in the post-halving market.

CleanSpark produced 694 BTC in May and reached a hashrate of 45.6 EH/s, a 7.5% increase from the previous month. The company also announced it now holds 12,502 BTC, double its treasury from a year ago, with all reserves mined directly. 

CleanSpark expanded its contracted power capacity to 987 megawatts and is on track to become the first public miner to hit 50 EH/s with fully self-operated infrastructure. 

CEO Zach Bradford said CleanSpark’s infrastructure-first model is built to support scaling beyond 60 EH/s while maintaining full operational control.

MARA, meanwhile, reported its strongest month since the April 2024 halving. The company produced 950 BTC in May, up 35% from April, and earned 282 blocks—a 38% month-over-month increase. 

MARA’s BTC holdings now exceed 49,000, with its self-operated MARA Pool contributing significantly through above-average block reward “luck” and operational efficiencies. 

CEO Fred Thiel emphasized MARA’s vertically integrated model as key to driving down costs and optimizing energy use.

Riot Platforms mined 514 BTC in May, marking an 11% increase from April. In addition to mining growth, Riot is investing heavily in its data center business. 

The company finalized the acquisition of 355 acres near its Corsicana site in Texas to build high-performance computing data centers aimed at enterprise and hyperscale clients. Riot also appointed Jonathan Gibbs, a veteran in the sector, as Chief Data Center Officer to lead the development of the new platform.

Together, the three miners are adapting to the post-halving environment by doubling down on infrastructure, vertical integration, and strategic treasury management.