This week, 4 Trading Companies & Distributors stocks are improving their overall ratings on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Beacon Roofing Supply, Inc. (BECN) earns a A this week, jumping up from last week’s grade of B. Beacon Roofing Supply, Inc. distributes residential and non-residential roofing materials in the United States and Canada. The company also gets A’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of BECN stock.

This week, Willis Lease Finance Corporation (WLFC) pushes up from a B to a A rating. Willis Lease Finance Corporation leases commercial aircraft engines and other aircraft-related equipment to air carriers, manufacturers, and overhaul/repair facilities worldwide. The company also gets A’s in sales growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of WLFC stock.

BMC Stock Holdings, Inc. (STCK) boosts its rating from a C to a B this week. The company also gets A’s in sales growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of STCK stock.

This is a strong week for Huttig Building Products, Inc. (HBP). The company’s rating climbs to A from the previous week’s B. Huttig Building Products, Inc. is a biopharmaceutical company specializing in the field of cancer therapy. The company also gets A’s in operating margin growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of HBP 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.