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

Luxfer Holdings PLC Sponsored ADR (LXFR) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this 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.

American Railcar Industries, Inc. (ARII) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. American Railcar Industries designs, manufactures, and sells hopper and tank railcars in North America. For more information, get Portfolio Grader’s complete analysis of ARII stock.

This week, WABCO Holdings (WBC) pushes up from a C to a B rating. 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.

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.