The grades of three Insurance stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

This week, ACE (NYSE:ACE) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). ACE provides a range of insurance and reinsurance products worldwide. In Portfolio Grader’s specific subcategory of Earnings Momentum, ACE also gets an A. For more information, get Portfolio Grader’s complete analysis of ACE stock.

This week, Aspen Insurance Holdings (NYSE:AHL) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Aspen Insurance Holdings provides insurance and reinsurance solutions worldwide. The stock price has risen 5.5% over the past month, better than the 2.9% increase the S&P 500 has seen over the same period of time.

For more information, get Portfolio Grader’s complete analysis of AHL stock.

This is a strong week for Endurance Specialty (NYSE:ENH). The company’s rating climbs to B from the previous week’s C. Endurance Specialty Holdings is the holding company for Endurance Specialty Insurance, which provides property and casualty insurance and reinsurance. Investors seem to agree with the upgraded status of the stock, and have pushed the stock up 7.7% over the past month. For more information, get Portfolio Grader’s complete analysis of ENH 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.