This week, the overall grades of four insurance stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Ambac Financial Group, Inc. (AMBC) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. The stock also earns F’s in Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Margin Growth and Sales Growth. For more information, get Portfolio Grader’s complete analysis of AMBC stock.

Independence Holding Company (IHC) earns a D this week, falling from last week’s grade of C. Independence Holding sells life and health insurance. The stock also rates an F in Sales Growth. Shares of the stock have been changing hands at an unusually rapid pace, four times the rate of the week prior. To get an in-depth look at IHC, get Portfolio Grader’s complete analysis of IHC stock.

This week, United Fire Group, Inc.’s (UFCS) rating worsens to a D from the company’s C rating a week ago. United Fire engages in writing property, casualty, and life insurance products and selling fixed annuities in the United States. The stock also gets an F in Earnings Growth. Shares of the stock have been exchanging at an usually rapid pace, twice the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of UFCS stock.

Slipping from a C to a D rating, Baldwin & Lyons, Inc. Class B (BWINB) takes a hit this week. Baldwin & Lyons markets and underwrites property and casualty insurance. The stock also gets an F in Earnings Surprise. To get an in-depth look at BWINB, get Portfolio Grader’s complete analysis of BWINB stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.