CBOE Holdings Inc.’s second exchange, C2, could quickly boost its market share once it lists the exclusive Standard & Poor’s 500 Index option, the head of a rival exchange said on Thursday.

“I wouldn’t be surprised at all if C2 didn’t rocket to 5 percent market share,” Jeromee Johnson, head of the BATS Options exchange said at the Futures Industry Association’s annual meeting. Listing S&P 500 index options electronically for the first time offers a “phenomenal opportunity,” he said on a panel discussion with the other U.S. options markets.