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

This week, GATX Corp. (NYSE:GMT) falls to a D (“sell”), worse than last week’s grade of C (“hold”). GATX is a specialized finance and leasing company focusing on the rail, marine and other targeted assets. In Portfolio Grader’s specific subcategories of Earnings Surprise and Cash Flow, GMT also gets F’s. For a full analysis of GMT stock, visit Portfolio Grader.

Slipping from a C to a D rating, W.W. Grainger (NYSE:GWW) takes a hit this week. 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.

The rating of Air Lease (NYSE:AL) declines this week from a C to a D. Air Lease engages in the purchase and leasing of commercial aircraft to airlines worldwide. The stock gets F’s in Earnings Momentum and Cash Flow. For more information, get Portfolio Grader’s complete analysis of AL stock.

Rush Enterprises‘s (NASDAQ:RUSHA) rating weakens this week, dropping to a D versus last week’s C. Rush operates over 50 full-service, integrated truck centers that span across the southern belt of the United States, which ranges from Florida to California. The stock also gets an F in Cash Flow. For a full analysis of RUSHA 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.