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Marathon mined the most bitcoin in June, 590, though that was 4% fewer than in May. CleanSpark (CLSK) mined 445 tokens, an increase of 7%, the report said. Marathon’s installed hashrate remained the largest of the U.S. listed miners, at 31.5 exahashes per second (EH/S) with Riot Platforms (RIOT) second with 22 EH/s, the report added.