The overall ratings of four insurance stocks are down on Portfolio Grader this week. 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. To get an in-depth look at AMBC, 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 twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of IHC stock.

United Fire Group, Inc. (UFCS) earns a D this week, falling 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 gets an F in Earnings Growth. To get an in-depth look at UFCS, get Portfolio Grader’s complete analysis of UFCS stock.

The rating of Baldwin & Lyons, Inc. Class B (BWINB) declines this week from a C to a D. Baldwin & Lyons markets and underwrites property and casualty insurance. The stock also rates an F in Earnings Surprise. For more information, 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.