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. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Margin Growth and Sales Growth, AMBC also gets F’s. For more information, get Portfolio Grader’s complete analysis of AMBC stock.

The rating of Independence Holding Company (IHC) slips from a C to a D. Independence Holding sells life and health insurance. The stock also gets an F in Sales Growth. Shares of the stock have been trading at an exceptionally rapid pace, up threefold from the week prior. To get an in-depth look at IHC, get Portfolio Grader’s complete analysis of IHC stock.

United Fire Group, Inc. (UFCS) earns a D this week, moving down from last week’s grade of C. United Fire engages in writing property, casualty, and life insurance products and selling fixed annuities in the United States. The stock also rates an F in Earnings Growth. For more information, get Portfolio Grader’s complete analysis of UFCS stock.

Baldwin & Lyons, Inc. Class B’s (BWINB) rating weakens this week, dropping to a D versus last week’s C. 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.