Ratterman was the chairman of the board of Bats Global Markets, a Kansas City, Mo.-based ECN, a role he assumed on March 31, 2015. He was previously CEO for eight years, beginning on July 1, 2007 when he succeeded BATS founder David Cummings. 
In his role as chairman, he remained closely involved at the company and facilitated Chris Concannon’s leadership transition. Ratterman continues to represent Bats as a member of the SEC Equity Market Structure Advisory Committee.
On March 25, 2012, Bats' IPO failed following a technical problem. Ratterman sent a letter to customers apologizing for the incident. On March 28, 2012, the Bats board announced its full support for Ratterman as president and CEO but moved to split the chairman and CEO roles. 
Previously, Ratterman served as vice president and chief operating officer of Bats. He joined BATS as a founding employee in June 2005 and served as executive vice president and chief operating officer from 2005 to mid-2007.
Before joining Bats, Ratterman was vice president of business development at Tradebot Systems. He also served as chief information officer at LabOne, a health screening and diagnostic testing company now owned by Quest Diagnostics. From 1990 to 2002, Ratterman was the chief technology officer at Bridge Information Systems.
Ratterman holds a degree in mathematics and computer science from Central Missouri State University in Warrensburg, Mo.
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