American Bitcoin (NASDAQ:ABTC) purchased 11,298 ASIC miners adding 3.05 exahash per second to expand owned capacity by 12% to 28.1 EH/s, but the stock plunged 7%, breaking below the critical $1 psychological level. The 12% Capacity Expansion The new machines are more efficient at 13.5 joules per terahash compared to the fleet average of 16 J/TH.