MGIC Investment Corp., the mortgage insurer that breached regulatory risk limits, fell after its fourth-quarter loss almost tripled, Bloomberg reported Thursday.

MGIC slid 15 percent to $2.37 at 8:21 a.m. in New York. The shares had gained 5.3% this year through yesterday.

MGIC’s net loss widened to $386.7 million, or $1.91 a share, from $135.3 million, or 67 cents, a year earlier, the Milwaukee-based company said in a statement today.