This week, 4 Insurance stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Prudential plc Sponsored ADR’s (PUK) rating worsens to a D from the company’s C rating a week ago. Prudential plc Sponsored ADR is an international company which provides a wide assortment of insurance and investment products and services. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of PUK stock.

National Interstate Corporation (NATL) is having a tough week. The company’s rating falls from a C to a D. National Interstate Corporation is a specialty property and casualty insurance company with a focus on the transportation industry. The company also gets F’s in earnings surprise and earnings momentum. For more information, get Portfolio Grader’s complete analysis of NATL stock.

This week, Patriot National, Inc. (PN) drops from a C to a D rating. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of PN stock.

This is a rough week for Till Capital Ltd (TIL). The company’s rating falls to D from the previous week’s C. For more information, get Portfolio Grader’s complete analysis of TIL 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.