This week, the overall grades of four commercial services stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

InnerWorkings, Inc. (INWK) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). InnerWorkings provides print procurement solutions to corporate clients in the United States. In Portfolio Grader’s specific subcategories of Earnings Momentum and Earnings Revisions, INWK also gets F’s. To get an in-depth look at INWK, get Portfolio Grader’s complete analysis of INWK stock.

Quest Resource Holding Corp.’s (QRHC) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. The stock gets F’s in Earnings Revisions, Equity and Cash Flow. For more information, get Portfolio Grader’s complete analysis of QRHC stock.

This week, Matthews International Corporation Class A (MATW) drops from a C to a D rating. Matthews International is a designer, manufacturer and marketer principally of memorialization products and brand solutions. To get an in-depth look at MATW, get Portfolio Grader’s complete analysis of MATW stock.

Slipping from a C to a D rating, Waste Management, Inc. (WM) takes a hit this week. Waste Management provides collection, transfer, recycling, disposal and waste-to-energy services. The stock receives F’s in Earnings Growth, Earnings Momentum, Earnings Surprise and Margin Growth. The stock’s trailing PE Ratio is 215.20. For more information, get Portfolio Grader’s complete analysis of WM 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.