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

Southwest Gas Corporation (SWX) boosts its rating from a B to a A this week. Southwest Gas Corporation is engaged in the business of purchasing, distributing and transporting natural gas to customers in three states. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of SWX stock.

This is a strong week for National Fuel Gas Company (NFG). The company’s rating climbs to B from the previous week’s C. National Fuel Gas Company is an integrated natural gas company with operations in all segments of the natural gas industry, including utility, pipeline and storage, exploration and production, and marketing operations. The company also gets A’s in earnings surprise, earnings momentum, and return on equity. For more information, get Portfolio Grader’s complete analysis of NFG stock.

New Jersey Resources Corporation (NJR) is seeing ratings go up from a C last week to a B this week. New Jersey Resources Corporation provides retail and wholesale energy services to customers in New Jersey and in states from the Gulf Coast to New England, and Canada. For more information, get Portfolio Grader’s complete analysis of NJR stock.

This week, South Jersey Industries, Inc.’s (SJI) ratings are up from a B last week to a A. South Jersey Industries, Inc. provides a variety of energy-related products and services. The company also gets A’s in sales growth and operating margin growth. For more information, get Portfolio Grader’s complete analysis of SJI 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.