If I was teaching this, I'd either give you an F or an A+, depending on whether I was trying to teach you business ethics or how the real world works. You found a source of arbitrage! Now you've got to maximize your manipulation of it. The 100 trades limit will prevent you from doing this continuously. You want to find the 50 biggest movements in percentage terms in the next 3 months. I'd watch for earnings announcements, results of drug trials for small biotech firms, that sort of thing. The bigger companies' stocks won't move that much on typical events, so use options to leverage your gains.