Thomas Peterffy, founder of Interactive Brokers.
Andrew Harrer | Bloomberg | Getty Images
Wall Street pioneer Thomas Peterffy told CNBC on Monday he sees more room for stocks to fall before they reach what he considers fair value.
Interactive Brokers founder: S&P 500 needs to drop at least another 9% to be fairly valued
Thomas Peterffy, founder of Interactive Brokers.
Andrew Harrer | Bloomberg | Getty Images
Wall Street pioneer Thomas Peterffy told CNBC on Monday he sees more room for stocks to fall before they reach what he considers fair value.
