This week, six insurance stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Assured Guaranty (AGO) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. Assured Guaranty provides credit enhancement products to the public finance, structured finance, and mortgage markets. In Portfolio Grader’s specific subcategories of Earnings Revisions, Earnings Surprise and Cash Flow, AGO also gets A’s. For more information, get Portfolio Grader’s complete analysis of AGO stock.

XL Group Plc (XL) is seeing ratings go up from a C last week to a B this week. XL provides property, casualty and specialty products to industrial, commercial and professional firms worldwide. For more information, get Portfolio Grader’s complete analysis of XL stock.

This week, Meadowbrook Insurance Group, Inc. (MIG) pushes up from a C to a B rating. Meadowbrook Insurance Group provides alternative risk management programs and services. For more information, get Portfolio Grader’s complete analysis of MIG stock.

This week, Montpelier Re Holdings (MRH) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Montpelier provides property and casualty reinsurance and insurance solutions. For more information, get Portfolio Grader’s complete analysis of MRH stock.

Endurance Specialty (ENH) shows solid improvement this week. The company’s rating rises from a C to a B. Endurance Specialty Holdings underwrites specialty lines of personal and commercial property and casualty insurance and reinsurance worldwide. For more information, get Portfolio Grader’s complete analysis of ENH stock.

This is a strong week for Hartford Financial Services Group, Inc. (HIG). The company’s rating climbs to B from the previous week’s C. The Hartford Financial Services Group provides a range of insurance products. For more information, get Portfolio Grader’s complete analysis of HIG 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.