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

This is a rough week for Diamond Offshore Drilling, Inc. (DO). The company’s rating falls to D from the previous week’s C. Diamond Offshore Drilling, Inc. is a global offshore oil and gas drilling contractor. The company also gets F’s in sales growth, earnings growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of DO stock.

This week, Nordic American Offshore Ltd.’s (NAO) rating worsens to a F from the company’s D rating a week ago. The company also gets F’s in sales growth, earnings revisions, earnings surprise, and free cash flow. For more information, get Portfolio Grader’s complete analysis of NAO stock.

This week, Mitcham Industries, Inc. (MIND) drops from a D to a F rating. 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 revisions, earnings surprise, earnings momentum, return on equity, and free cash flow. 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.