This week, 3 Energy Equipment & Services stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Patterson-UTI Energy, Inc. (PTEN) experiences a ratings drop this week, going from last week’s C to a D. Patterson-UTI Energy, Inc. provides land-based drilling services to major and independent oil and natural gas companies. The company also gets F’s in sales growth, operating margin growth, and earnings growth. For more information, get Portfolio Grader’s complete analysis of PTEN stock.

This week, Tesco Corporation (TESO) drops from a D to a F rating. Tesco Corporation designs, manufactures, and delivers technology-based solutions for the upstream energy industry. The company also gets F’s in sales growth, operating margin growth, earnings revisions, earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of TESO stock.

Slipping from a C to a D rating, Mitcham Industries, Inc. (MIND) takes a hit this week. Mitcham Industries, Inc. is engaged in the leasing of seismic equipment to the oil and gas industry throughout the world. The company also gets F’s in sales growth, earnings surprise, earnings momentum, and return on equity. For more information, get Portfolio Grader’s complete analysis of MIND 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.