Bitmain

Bitmain is the largest manufacturer of Bitcoin (SHA-256) ASICs by global market share. Founded in 2013 in Beijing, the company shipped the first commercial Antminer in 2014 and has produced every subsequent generation through to the current S21 family. Across the industry, more than half of the global hash rate runs on Bitmain hardware.The Antminer S21 series — S21, S21++, S21 XP, S21 XP Hyd, S21 XP Immersion — covers the full range from $1,500 entry-tier to $10,000 hydro-cooled flagships. Manufacturer warranty is 180 days from delivery on new units. Firmware is closed and signed; under-volting and aftermarket firmware are possible but void warranty. For altcoin mining, Bitmain produces the Antminer L-series (Scrypt / Litecoin), E-series (Etchash / Ethereum Classic), D-series (X11 / Dash), and KS-series (kHeavyHash / Kaspa).If you’re new to mining hardware and have no specific reason to buy elsewhere, Bitmain is the default. The risk profile is the lowest in the industry — large company, real corporate presence, established RMA process. The trade-off is higher pricing and tighter firmware constraints than smaller manufacturers.