The overall ratings of 6 Energy Equipment & Services stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This is a rough week for Helmerich & Payne, Inc. (HP). The company’s rating falls to D from the previous week’s C. Helmerich & Payne, Inc. provides contract drilling of oil and gas wells in the Gulf of Mexico and South America. The company also gets F’s in sales growth, earnings growth, earnings revisions, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of HP stock.

U.S. Silica Holdings, Inc.’s (SLCA) rating weakens this week, dropping to a D versus last week’s C. U.S. Silica Holdings, Inc. engages in the mining, processing, and sale of commercial silica in the United States. The company also gets F’s in sales growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SLCA stock.

This week, Transocean Ltd. (RIG) drops from a C to a D rating. Transocean Ltd. provides offshore contract drilling services for oil and gas wells. The company also gets F’s in sales growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of RIG stock.

USA Compression Partners LP (USAC) is having a tough week. The company’s rating falls from a C to a D. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of USAC stock.

Archrock Partners LP (APLP) experiences a ratings drop this week, going from last week’s D to a F. The company also gets F’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of APLP stock.

Willbros Group, Inc. (WG) declines this week from a C to a D. Willbros Group, Inc. provides engineering and construction services to the oil, gas, refinery, petrochemical and power industries with a focus on infrastructure such as oil and gas pipeline systems, electric transmission and distribution services and refinery downstream markets. The company also gets F’s in sales growth, earnings growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of WG 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.