System1 (SST) is up 28.3%, or $1.74 to $7.87. Published first on TheFly – the ultimate source for real-time, market-moving breaking financial news. Try Now>> See the top stocks recommended by analysts >> Read More on SST: System1 trading resumes System1 trading halted, volatility trading pause System1 rises 16.4% System1 rises 16.9% System1 rises 36.2% Disclaimer & DisclosureReport an Issue