Bonds

Ambac Follows MBIA: Will Raise Capital, Slashes Dividend in Bid to Maintain Ratings 

The stock market was roiled Wednesday in part by bond insurer Ambac Financial Group, which said it would seek to raise $1 billion in capital while slashing its quarterly dividend by more than 60 percent as part of a plan to maintain its AAA ratings from each of the major rating agencies. MBIA announced a similar plan last week.