[mrchicity]

RenTech doesn't publish much so I'm merely conjecturing based on their volumes and other information that's in legal filings. There are a lot of ways to provide liquidity and fair pricing over diverse time horizons. It doesn't really matter how they do it. If your bets are independent and you have a statistically significant edge, you are basically guaranteed to make money with proper bankroll management.

From what Virtu's published, they make two-way markets, and once filled they scalp a tick, arbitrage in another product, or cross if the market becomes weak. Maybe RenTech does something like buy underpriced oil producers whose prices haven't moved up after bellwether stocks in the industry like XOM and CVX have, then sell once the spread between them converges. I'm sure both firms have loads of different tactics. The key thing is that they're mildly better than chance.