MF Global Holdings Ltd.’s executive in charge of controlling risks raised serious concerns several times last year to directors at the securities firm about the growing bet on European bonds by his boss, Jon S. Corzine, people familiar with the matter said.
The board allowed the company’s exposure to troubled European sovereign debt to swell from about $1.5 billion in late 2010 to $6.3 billion shortly before MF Global tumbled into bankruptcy Oct. 31, these people said. The executive who challenged Mr. Corzine resigned in March.