One Year Later, BATS Is Doing Just Fine

Long after the markets closed on Jan. 9, Joe Ratterman, the chief executive officer of BATS Global Markets, was in his office trying to figure out how to keep a small computer error from killing his business. His programmers had just discovered a glitch in the company’s code that, over a period of four years, had caused hundreds of thousands of transactions to be bought and sold at the wrong price.