The grades of six Insurance stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

ACE (NYSE:ACE) is bumping up its rating from a C (“hold”) to a B (“buy”) this week. ACE provides a range of insurance and reinsurance products worldwide. In Portfolio Grader’s specific subcategories of Cash Flow, Margin Growth, and Sales Growth, ACE also gets A’s. For more information, get Portfolio Grader’s complete analysis of ACE stock.

Employers Holdings’ (NYSE:EIG) ratings are looking better this week, moving up to a B from last week’s C. Employers Holdings operates in the commercial property and casualty insurance industry in the United States. For more information, get Portfolio Grader’s complete analysis of EIG stock.

United Fire Group (NASDAQ:UFCS) gets a higher grade this week, advancing from a C last week to a B. United Fire & Casualty writes property, casualty, and life insurances. Shares of UFCS have increased 6.7% over the past month, better than the 4.7% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of UFCS stock.

AFLAC (NYSE:AFL) improves from a C to a B rating this week. Aflac is a general business holding company and acts as a management company that primarily sells supplemental health and life insurance in the United States and Japan. The stock’s trailing PE Ratio is 8.80. For more information, get Portfolio Grader’s complete analysis of AFL stock.

This week, Chubb Corp.’s (NYSE:CB) ratings are up from a C last week to a B. Chubb Corporation provides property and casualty insurance to businesses and individuals around the world. For more information, get Portfolio Grader’s complete analysis of CB stock.

This is a strong week for Markel Corp. (NYSE:MKL). The company’s rating climbs to B from the previous week’s C. Markel markets and underwrites specialty insurance products and programs to a variety of niche markets. For more information, get Portfolio Grader’s complete analysis of MKL 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.