Alasdair Haynes, current chief executive of Chi-X Europe, will depart after a transition period following the transaction close.
Hemsley joined BATS Europe in 2008 as CEO and is also a senior vice president of BATS Global Markets. He will continue to report to Joe Ratterman, president and CEO of BATS Global Markets.
Haynes joined Chi-X Europe in late 2009 as CEO to lead the company through its transition from a subsidiary of Instinet Holdings to an independent company.
In February, BATS entered a definitive agreement to purchase Chi-X Europe, under which Chi-X Europe and BATS Europe will combine to form BATS Chi-X Europe.
The transaction is expected to close in the second quarter, pending regulatory approvals.
Subject to regulatory approval, Hemsley will initially head both the BATS Europe and Chi-X Europe organizations after the deal close and will assume the CEO role for the combined BATS Chi-X Europe entity following the transfer of business, which is anticipated this summer.
