This week, three machinery stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

Luxfer Holdings PLC Sponsored ADR (LXFR) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Luxfer Holdings, a materials technology company, engages in the design, manufacture, and supply of materials, components, and gas cylinders. In Portfolio Grader’s specific subcategory of Equity, LXFR also gets an A. For more information, get Portfolio Grader’s complete analysis of LXFR stock.

WABCO Holdings (WBC) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Wabco Holdings manufactures and sells control systems, including advanced braking, stability, suspension, transmission control and air compressing and processing systems, that improve vehicle performance and safety and reduce overall vehicle operating costs. For more information, get Portfolio Grader’s complete analysis of WBC stock.

This week, American Railcar Industries, Inc.’s (ARII) ratings are up from a C last week to a B. American Railcar Industries designs, manufactures, and sells hopper and tank railcars in North America. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of ARII 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.