By Lilla Zuill

Ambac Financial said on Wednesday that the statutory capital of its main unit was well above a regulatory minimum at the end of the third quarter, easing concerns that the company would fall short of funds and be at risk of being taken over by state officials.

Shares of Assured Guaranty Ltd. slid more than 6 percent in Tuesday aftermarket trading, after the bond insurer said acquisition and other costs will cause it to post a loss for the third quarter.

By Emily Chasan

Shares of Ambac Financial Group Inc. plunged 33 percent Tuesday after the embattled bond insurer said it may be forced to file for bankruptcy protection if it cannot improve its cash position.