This week, the overall grades of 3 Commercial Services & Supplies stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Covanta Holding Corporation (CVA) drops from a C to a D rating. Covanta Holding Corporation develops, owns, and operates infrastructure for the conversion of waste to energy, as well as other waste disposal and renewable energy production businesses in the Americas, Europe, and Asia. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of CVA stock.

Perma-Fix Environmental Services, Inc. (PESI) experiences a ratings drop this week, going from last week’s C to a D. Perma-Fix Environmental Services, Inc. provides industrial and nuclear-waste management services, and Consulting Engineering Services. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of PESI stock.

This is a rough week for Intersections Inc. (INTX). The company’s rating falls to D from the previous week’s C. Intersections Inc. provides credit management and identity theft protection solutions to the consumer and small business markets on a subscription basis. The company also gets F’s in sales growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of INTX 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.