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

WGL Holdings, Inc. (WGL) earns a A this week, jumping up from last week’s grade of B. WGL Holdings, Inc. sells and delivers natural gas, and provides a range of energy-related products and services. The company also gets A’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of WGL stock.

AGL Resources, Inc. (GAS) is seeing ratings go up from a B last week to a A this week. AGL Resources, Inc. distributes natural gas to residential, commercial, industrial, and governmental customers in Illinois, Georgia, Virginia, New Jersey, Florida, Tennessee, and Maryland. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of GAS stock.

Southwest Gas Corporation’s (SWX) ratings are looking better this week, moving up to a B from last week’s C. Southwest Gas Corporation is engaged in the business of purchasing, distributing and transporting natural gas to customers in three states. For more information, get Portfolio Grader’s complete analysis of SWX stock.

This week, Northwest Natural Gas Company (NWN) pushes up from a B to a A rating. Northwest Natural Gas Company distributes natural gas to customers in western Oregon, as well as portions of Washington. For more information, get Portfolio Grader’s complete analysis of NWN 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.