This week, the overall grades of three 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. The stock’s trailing PE Ratio is 66.00. For more information, get Portfolio Grader’s complete analysis of INWK stock.

Matthews International Corporation Class A (MATW) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Matthews International is a designer, manufacturer and marketer principally of memorialization products and brand solutions. The stock currently has a trailing PE Ratio of 31.30. To get an in-depth look at MATW, get Portfolio Grader’s complete analysis of MATW stock.

This is a rough week for Waste Management, Inc. (WM). The company’s rating falls to D from the previous week’s C. Waste Management provides collection, transfer, recycling, disposal and waste-to-energy services. In Earnings Growth, Earnings Momentum, Earnings Surprise and Margin Growth the stock gets F’s. The stock’s trailing PE Ratio is 222.30. 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.