NEW YORK (TheStreet) -- Insurance stocks more than tripled from the market low in March through the end of last year, four times the pace of the S&P 500 Index. This year, they're struggling. Here are the five insurance stocks with the biggest gains in short interest in the past seven days, suggesting investors increasingly are becoming more bearish on the companies.
4. Ambac Financial Group ( ABK): New York-based bond insurer.
2. NYMAGIC ( NYM): New York-based property and casualty insurer.
1. FBL Financial Group ( FFG): Iowa-based life and annuities insurance group.