Five Oil and Gas stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

Chesapeake Midstream Partners (NYSE:CHKM) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. Chesapeake Midstream Partners owns, operates, develops, and acquires natural gas, natural gas liquids, and oil gathering systems, as well as other midstream energy assets in the United States. For more information, get Portfolio Grader’s complete analysis of CHKM stock.

This week, Oiltanking Partners LP (NYSE:OILT) is making solid headway. The company’s rating improves to an A (“strong buy”) from last week’s B (“buy”) rating. Oiltanking Partners LP engages in the terminaling, storage and transportation of crude oil, refined petroleum products and liquefied petroleum gas. . Shares of OILT have increased 12.9% over the past month, better than the 3.3% increase the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of OILT stock.

This week, Spectra Energy Partners (NYSE:SEP) pushes up from a C to a B rating. Spectra Energy Partners gathers and transports natural gas through interstate pipeline systems. For more information, get Portfolio Grader’s complete analysis of SEP stock.

Magellan Midstream Partners’ (NYSE:MMP) ratings are looking better this week, moving up to an A from last week’s B. Magellan Midstream Partners is primarily involved in the storage, transportation, and distribution of refined petroleum products and ammonia. Investors seem to agree with the upgraded status of the stock, and have pushed the stock up 5.7% over the past month. For more information, get Portfolio Grader’s complete analysis of MMP stock.

Inergy Midstream LP (NYSE:NRGM) earns a B this week, jumping up from last week’s grade of C. Inergy Midstream LLC owns, operates, develops and acquires midstream energy assets. Its current asset base consists of natural gas and NGL storage and transportation assets located in the Northeast region of the United States. The company owns and operates four natural gas storage facilities located… Wall Street seems to agree with the upgrade and has propelled the stock up 8.5% over the past month. For more information, get Portfolio Grader’s complete analysis of NRGM 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.