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”).

This week, KAR Auction Services (NYSE:KAR) falls to a D (“sell”), worse than last week’s grade of C (“hold”). KAR Auction Services provides wholesale vehicle auction services in North America. The stock’s trailing PE Ratio is 39.6. For more information, get Portfolio Grader’s complete analysis of KAR stock.

The rating of Heritage-Crystal Clean (NASDAQ:HCCI) slips from a C to a D. Heritage-Crystal Clean offers parts cleaning services. The stock gets F’s in Cash Flow and Margin Growth. The trailing PE Ratio for the stock is 159.7. Shares of HCCI have declined 8.7% since last month, more than the 1% drop the Nasdaq has seen over the same time. For a full analysis of HCCI stock, visit Portfolio Grader.

The rating of A.T. Cross (NASDAQ:ATX) declines this week from a C to a D. A. T. Cross is a designer and marketer of branded personal accessories including writing instruments, watches, reading glasses, personal and business accessories and sunglasses. The stock also rates an F in Earnings Surprise. To get an in-depth look at ATX, get Portfolio Grader’s complete analysis of ATX 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.