According to Crain's Chicago Business, a New York private-equity firm is planning to take control of OptionsHouse LLC and TradeMonster Group Inc. by investing in both of them and then merging the two companies.

General Atlantic LLC is purchasing OptionsHouse from Peak6 Investments LP and acquiring a majority interest in TradeMonster.

If the buyout is approval by regulators, the completion of the transaction is expected by the third quarter.