"On February 19, 2013, pending regulatory approval, CBOE Holdings plans to transition its SPXpm product from its all-electronic C2 Options Exchange (C2) to Chicago Board Options Exchange (CBOE), where it will be traded on CBOE's hybrid trading model, which incorporates both electronic and open outcry trading. Its flagship SPX option, which is a.m.-settled, will continue to trade in CBOE's open outcry environment under ticker "SPX." The migration of SPXpm from C2 to CBOE is expected to result in increased access and liquidity by exposing the product to an even broader user base and simplifying spread trading." http://www.c2exchange.com/micro/SPXpm/default.aspx http://ir.cboe.com/releasedetail.cfm?ReleaseID=723909