Hut 8 and Cleanspark are mining rig cos, albeit Cleanspark is more of an energy efficiency and microgrid company. Voyager Digital is more like a wallet/exchange/asset manager. Galaxy digital is mike novogratz's co and theyre basically asset management and trading for institutionals... essentially trying to be the goldman sachs of crypto. MOGO is a cashless payment platform kind of like Square, but they hold BTC and reward userbase with BTC.