IntercontinentalExchange, Inc. (ICE) said Thursday Duncan Niederauer will continue to serve as its co-president, while retiring as the CEO of NYSE Group, effective immediately, in light of the rapid integration of ICE and NYSE.

ICE said Niederauer will continue contributing to the companies’ integration through August 2014.

Thomas Farley, chief operating officer of the NYSE and former ICE Futures U.S. president, will succeed Niederauer, and is taking the title of president of NYSE Group, effective immediately.

“The transition to ICE ownership has gone smoothly, and with our integration well on track, accelerating the final stages of my transition will only extend that progress and provide clarity on future leadership,” Niederauer said.

He served as CEO of NYSE Euronext from 2007 through late 2013, when the acquisition by ICE was completed.