"Historically, our profits have been principally a function of transaction volume on electronic exchanges rather than volatility or the direction of price movements. Our strategy is to calculate quotes at which supply and demand for a particular security are likely to be in balance a few seconds ahead of the market and execute small trades at tiny but favorable differentials. Our quotes are based on our proprietary model rather than customer order flow, and we believe that this approach provides us with a competitive advantage."
is that considered market making or proprietary trading? It's 80% of their revenue, and the founder still owns 85% of the company?!?! Incredible success story...