SOS Limited, Riot Blockchain, Silvergate stocks ride the Bitcoin advance

With Bitcoin breaching $50K then retreating to ~$49K, a number of crypto-related names are also on the move.SOS Limited (SOS), which last week priced an ADS and warrants offering, surges 32% in premarket.Riot Blockchain (RIOT) climbs 12% and Marathon Patent Group (MARA) gains 9.0%. MGT Capital Investments (MGTI) rises 10%.Silvergate Capital (SI) rises 4.5%, but was up 6.1% earlier in premarket hours, and Grayscale Bitcoin Trust (GBTC) rises 3.4%.ARK Fintech Innovation ETF (ARKF) rises 2.4%.SI, SOS, and RIOT vs. Bitcoin's return in the past six months:Earlier, MicroStrategy will use net proceeds from its $600M senior notes offering to buy more Bitcoin.