This week, the overall grades of 3 Insurance stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

State Auto Financial Corporation (STFC) gets weaker ratings this week as last week’s C drops to a D. State Auto Financial Corporation is a property and casualty insurance company engaged in writing personal and business lines of insurance. The company also gets F’s in earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of STFC stock.

Slipping from a C to a D rating, Donegal Group Inc. Class A (DGICA) takes a hit this week. Donegal Group Inc. Class A offers personal and commercial lines of property and casualty insurance to businesses and individuals. The company also gets F’s in earnings surprise and earnings momentum. For more information, get Portfolio Grader’s complete analysis of DGICA stock.

OneBeacon Insurance Group, Ltd. Class A (OB) slips from a C to a D this week. OneBeacon Insurance Group, Ltd. Class A offers specialized insurance products and services. For more information, get Portfolio Grader’s complete analysis of OB 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.