The grades of three machinery stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated 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. The stock has inched up 1.3% over the past week. Trade volume fell markedly in the past week, standing at half of the previous rate. For more information, get Portfolio Grader’s complete analysis of LXFR stock.

WABCO Holdings (WBC) ups its rating to a B (“buy”) this week after earning a C (“hold”) in the week before. 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. At $103.91, the stock is above the 50-day moving average of $99.72. For more information, get Portfolio Grader’s complete analysis of WBC stock.

The rating of American Railcar Industries, Inc. (ARII) moves up this week, rising from a C to a B. 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.

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.