As head of private equity firm Bain Capital LLC, Romney was the lead deal-maker, buying and selling companies to make money for investors. Whether companies boomed or filed for bankruptcy, the Boston-based firm found profits for Romney, its other executives and investors. Romney, who spent most of his career at Bain, estimated his wealth in 2007 at as much as $250 million. He has yet to update his financial status for the 2012 presidential campaign. …

At Dade Behring Inc., a medical-testing company based in Deerfield, Illinois, Bain cut at least 1,600 jobs during a series of acquisitions before the firm entered into bankruptcy in 2002. Romney foreshadowed those cuts in a speech to employees shortly after Bain acquired the firm.

DDi Corp., an electronics company in Anaheim, California, filed for bankruptcy in 2003 after Bain sold shares in the company generating at least $85.5 million and billed $10 million in management fees.

GS Industries Inc., a steel company in Charlotte, North Carolina, filed for bankruptcy in 2001 after workers said a chief executive hired under Bain made missteps, including installing managers who lacked industry expertise, former employees said.