This week, 16 Insurance stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, White Mountains Insurance Group Ltd (WTM) pushes up from a C to a B rating. White Mountains Insurance Group Ltd provides property and casualty insurance, and reinsurance. The company also gets A’s in sales growth, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of WTM stock.

Enstar Group Limited (ESGR) gets a higher grade this week, advancing from a C last week to a B. Enstar Group Limited acquires and manages insurance and reinsurance companies in run-off. The company also gets A’s in sales growth, operating margin growth, earnings growth, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of ESGR stock.

RenaissanceRe Holdings Ltd. (RNR) shows solid improvement this week. The company’s rating rises from a B to a A. RenaissanceRe Holdings Ltd. provides reinsurance and insurance coverages and related services. The company also gets A’s in earnings growth, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of RNR stock.

This is a strong week for Navigators Group, Inc. (NAVG). The company’s rating climbs to B from the previous week’s C. Navigators Group, Inc. is an international commercial property & casualty specialty insurance holding company with insurance company operations, and underwriting management companies. For more information, get Portfolio Grader’s complete analysis of NAVG stock.

FBL Financial Group, Inc. Class A (FFG) is seeing ratings go up from a C last week to a B this week. FBL Financial Group, Inc. Class A underwrites, markets, and distributes life insurance, annuities, and mutual funds. For more information, get Portfolio Grader’s complete analysis of FFG stock.

Safety Insurance Group, Inc. (SAFT) earns a A this week, jumping up from last week’s grade of B. Safety Insurance Group, Inc. is a provider of private passenger automobile insurance in Massachusetts. For more information, get Portfolio Grader’s complete analysis of SAFT stock.

Marsh & McLennan Companies, Inc. (MMC) boosts its rating from a B to a A this week. Marsh & McLennan Companies, Inc. is a global professional services firm providing advice and solutions in the areas of risk, strategy and human capital. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of MMC stock.

The rating of AMERISAFE, Inc. (AMSF) moves up this week, rising from a C to a B. AMERISAFE, Inc. markets and underwrites workers’ compensation insurance. The company also gets A’s in operating margin growth and return on equity. For more information, get Portfolio Grader’s complete analysis of AMSF stock.

Mercury General Corporation’s (MCY) ratings are looking better this week, moving up to a B from last week’s C. Mercury General Corporation operates as an insurance holding company, engaged mainly in writing automobile insurance. The company also gets A’s in operating margin growth, earnings growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of MCY stock.

This week, Loews Corporation’s (L) ratings are up from a C last week to a B. Loews Corporation is involved in a variety of businesses including commercial property-casualty insurance, offshore drilling, natural gas exploration and production, operation of natural gas pipeline systems, and the operation of hotels and resorts. The company also gets A’s in earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of L stock.

Selective Insurance Group, Inc. (SIGI) improves from a C to a B rating this week. Selective Insurance Group, Inc. offers property and casualty insurance products and services the eastern and midwestern regions of the United States. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of SIGI stock.

This week, CNA Financial Corporation’s (CNA) ratings are up from a C last week to a B. CNA Financial Corporation provides insurance and risk-management products and services to associations, professionals, individuals, and small, medium, and large businesses. The company also gets A’s in earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CNA stock.

Assured Guaranty Ltd. (AGO) improves from a C to a B rating this week. Assured Guaranty Ltd. provides credit enhancement products to the public finance, structured finance, and mortgage markets. The company also gets A’s in earnings revisions, earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of AGO stock.

This week, Ambac Financial Group, Inc. (AMBC) pushes up from a C to a B rating. The company also gets A’s in sales growth, operating margin growth, earnings revisions, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of AMBC stock.

OneBeacon Insurance Group, Ltd. Class A (OB) earns a B this week, jumping up from last week’s grade of C. OneBeacon Insurance Group, Ltd. Class A offers specialized insurance products and services. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of OB stock.

This is a strong week for Health Insurance Innovations, Inc. Class A (HIIQ). The company’s rating climbs to A from the previous week’s B. The company also gets A’s in sales growth, earnings revisions, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of HIIQ 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.