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

The ADT Corporation (NYSE:ADT) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. The ADT Corp. provides electronic security, interactive home and business automation and alarm monitoring services industry in the U.S. and Canada. Its broad set of products and services, including ADT Pulse interactive home and business solutions, and home health services, meet a range of customer … As of Oct. 23, 2013, 10.5% of outstanding The ADT Corporation shares were held short. The trailing PE Ratio for the stock is 28.60. For more information, get Portfolio Grader’s complete analysis of ADT stock.

The Brink’s Company (NYSE:BCO) is having a tough week. The company’s rating falls from a C to a D. Brink’s provides secure transportation, cash logistics, and other security-related services to banks and financial institutions, retailers, government agencies, mints, jewelers and other commercial operations around the world. The stock gets F’s in Earnings Revisions, Cash Flow, and Sales Growth. The stock currently has a trailing PE Ratio of 71.80. To get an in-depth look at BCO, get Portfolio Grader’s complete analysis of BCO stock.

Clean Harbors, Inc.’s (NYSE:CLH) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Clean Harbors provides environmental services and solutions to customers across North America. The stock gets F’s in Earnings Growth and Earnings Surprise. The stock’s trailing PE Ratio is 37.10. For a full analysis of CLH stock, visit Portfolio Grader.

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.