Subprime trading losses at Japan's Mizuho Financial Group Inc exceeded 600 billion yen ($5.84 billion) last business year, at least 13 percent more than what it had flagged just weeks ago, the Yomiuri newspaper reported on Saturday.
Japan's second-largest bank had said at the end of April that it expected such losses, mostly at its brokerage arm, to total 531 billion yen for the year that ended on March 31, but unforeseen losses also swelled at its corporate banking unit, the paper said.