This week, the ratings of three commercial services stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

InnerWorkings, Inc. (INWK) ratings are on the decline this week as the company earns an F (“strong sell”). Last week, it received a 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 62.80. 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 30.10. To get an in-depth look at MATW, get Portfolio Grader’s complete analysis of MATW stock.

Waste Management, Inc. (WM) earns a D this week, falling from last week’s grade of C. Waste Management provides collection, transfer, recycling, disposal and waste-to-energy services. The stock gets F’s in Earnings Growth, Earnings Momentum, Earnings Surprise and Margin Growth. The trailing PE Ratio for the stock is 211.60. 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.