3 Energy Equipment & Services 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”).

U.S. Silica Holdings, Inc. (SLCA) shows solid improvement this week. The company’s rating rises from a C to a B. U.S. Silica Holdings, Inc. engages in the mining, processing, and sale of commercial silica in the United States. The company also gets A’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of SLCA stock.

The rating of Natural Gas Services Group, Inc. (NGS) moves up this week, rising from a D to a B. Natural Gas Services Group, Inc. manufactures, sells, and rents gas compression and low emissions flare systems. The company also gets A’s in earnings surprise and free cash flow. For more information, get Portfolio Grader’s complete analysis of NGS stock.

This week, Fairmount Santrol Holdings, Inc. (FMSA) pushes up from a C to a B rating. The company also gets A’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of FMSA 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.