This week, 4 Insurance stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

National Interstate Corporation’s (NATL) ratings are looking better this week, moving up to a B from last week’s C. National Interstate Corporation is a specialty property and casualty insurance company with a focus on the transportation industry. The company also gets A’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of NATL stock.

Blue Capital Reinsurance Holdings Ltd. (BCRH) gets a higher grade this week, advancing from a B last week to a A. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of BCRH stock.

This is a strong week for Kingstone Companies, Inc. (KINS). The company’s rating climbs to A from the previous week’s B. Kingstone Companies, Inc. offers homeowners, automobile, fire, canine legal liability, business owner, and umbrella coverages. The company also gets A’s in operating margin growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of KINS stock.

CNinsure, Inc. Sponsored ADR (CISG) boosts its rating from a C to a B this week. CNinsure, Inc. Sponsored ADR is an independent insurance intermediary company that operates in China. The company also gets A’s in earnings surprise and free cash flow. For more information, get Portfolio Grader’s complete analysis of CISG 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.