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

This week, Titan Machinery (TITN) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Titan Machinery owns and operates networks of full service agricultural and construction equipment stores. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Revisions, Earnings Surprise, Margin Growth and Sales Growth, TITN also gets F’s. As of Dec. 24, 2014, 25% of outstanding Titan Machinery shares were held short. To get an in-depth look at TITN, get Portfolio Grader’s complete analysis of TITN stock.

Fastenal Company (FAST) earns a D this week, falling from last week’s grade of C. Fastenal sells industrial and construction supplies in a wholesale and retail fashion. As of Dec. 24, 2014, 10.1% of outstanding Fastenal Company shares were held short. The trailing PE Ratio for the stock is 29.80. For more information, get Portfolio Grader’s complete analysis of FAST stock.

This week, W.W. Grainger, Inc. (GWW) drops from a C to a D rating. W.W. Grainger is a distributor of facilities maintenance products and provides services and related information used by businesses and institutions throughout North America. To get an in-depth look at GWW, get Portfolio Grader’s complete analysis of GWW 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.