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.’s (AMBC) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Margin Growth and Sales Growth, AMBC also gets F’s. Shares of the stock have been changing hands at an unusually rapid pace, up 1934% from the week prior. For more information, get Portfolio Grader’s complete analysis of AMBC stock.

This week, Independence Holding Company (IHC) drops from a C to a D rating. Independence Holding sells life and health insurance. The stock also gets an F in Sales Growth. Trade volume is up 713% from the previous week. To get an in-depth look at IHC, get Portfolio Grader’s complete analysis of IHC stock.

The rating of United Fire Group, Inc. (UFCS) slips from a C to a D. 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. Shares of the stock are being traded at a very rapid pace, up 1612% from the week prior. 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. Shares of the stock have been changing hands at an unusually rapid pace, up 659.2% from the week prior. 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.