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

StanCorp Financial Group (NYSE:SFG) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. StanCorp Financial Group is a holding company that conducts business through wholly-owned operating subsidiaries throughout the United States. For Portfolio Grader’s specific subcategory of Earnings Revisions, SFG also gets an F. To get an in-depth look at SFG, get Portfolio Grader’s complete analysis of SFG stock.

Prudential Financial (NYSE:PRU) earns a D this week, moving down from last week’s grade of C. Prudential Financial provides financial services throughout the United States and several locations worldwide. The stock also gets an F in Earnings Surprise. For a full analysis of PRU stock, visit Portfolio Grader.

This is a rough week for OneBeacon Insurance Group (NYSE:OB). The company’s rating falls to D from the previous week’s C. OneBeacon Insurance Group offers specialized insurance products and services. The stock also gets an F in Earnings Surprise. To get an in-depth look at OB, 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.