The ratings of 3 Energy Equipment & Services stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Oceaneering International, Inc.’s (OII) rating worsens to a F from the company’s D rating a week ago. Oceaneering International, Inc. is an applied technology company based in Houston, Texas that provides engineered services and hardware to customers who operate in marine, space and other environments. The company also gets F’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of OII stock.

This week, Frank’s International NV (FI) drops from a C to a D rating. The company also gets F’s in sales growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of FI stock.

C&J; Energy Services Ltd. (CJES) gets weaker ratings this week as last week’s D drops to a F. C&J; Energy Services Ltd. provides hydraulic fracturing, coiled tubing, wireline, and other complementary services to oil and gas exploration and production companies in the United States. The company also gets F’s in operating margin growth, earnings growth, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CJES 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.