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

WESCO International, Inc.’s (WCC) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Wesco International is a North American distributor of products and provider of supply chain services used mainly in the industrial, construction, utility and commercial, institutional and government markets. The stock price has fallen 7.8% over the past month, worse than the 1.7% decrease the S&P 500 has seen over the same period of time. To get an in-depth look at WCC, get Portfolio Grader’s complete analysis of WCC stock.

This week, W.W. Grainger, Inc.’s (GWW) rating worsens to a D from the company’s C rating a week ago. W.W. Grainger is a distributor of facilities maintenance products and provides services and related information used by businesses and institutions throughout North America. For more information, get Portfolio Grader’s complete analysis of GWW stock.

Slipping from a C to a D rating, Houston Wire & Cable Company (HWCC) takes a hit this week. Houston Wire & Cable distributes specialty wire- and cable-related services to the electrical distribution market. The stock gets F’s in Earnings Growth, Earnings Momentum and Earnings Revisions. The stock has a trailing PE Ratio of 25.50. To get an in-depth look at HWCC, get Portfolio Grader’s complete analysis of HWCC 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.