Ranking of Bitcoin Holdings by Mining Companies: Marathon Digital tops the list with 27,562 Bitcoins. Riot Platforms and Hut 8 Mining hold 10,928 and 9,110 Bitcoins respectively, ranking second and third. Among other major mining companies, CleanSpark holds 8,701 Bitcoins, HIVE Blockchain holds 2,624 Bitcoins, and Cipher Mining and Bitfarms hold 1,428 and 1,188 Bitcoins respectively. DMG Blockchain ranks at the bottom of the list with 590 Bitcoins.