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BATS President William O'Brien leaves, CEO Joe Ratterman to assume duties

Joseph 'Joe' Ratterman, president and chief executive officer of BATS Global Markets Inc., looks on during a Senate Permanent Subcommittee on Investigations hearing in Washington, June 17, 2014.
Andrew Harrer | Bloomberg | Getty Images
Joseph 'Joe' Ratterman, president and chief executive officer of BATS Global Markets Inc., looks on during a Senate Permanent Subcommittee on Investigations hearing in Washington, June 17, 2014.

BATS Global Markets, a global operator of securities markets, announced in a release on Tuesday that its president, William O'Brien, has left the company.

CEO Joe Ratterman will reassume his role of President and CEO, a position the release said he had held from June 2007 to January 2014.

None of the other executive management are affected, the company said, without giving a reason for O'Brien's departure. The new roles were apparent on the BATS website immediately following the announcement.

In an April CNBC segment, O'Brien challenged author Michael Lewis and IEX's Brad Katsuyama on their assertion that high-speed traders rigged the markets.

Read MoreWatch the fight that stopped trading at the NYSE

—By CNBC.com. Reuters contributed to this report.

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