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 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. The stock’s price of $20.00 is above the 50-day moving average of $19.86. 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 LXFR stock.

WABCO Holdings’ (WBC) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). 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 is a strong week for American Railcar Industries, Inc. (ARII). The company’s rating climbs to B from the previous week’s C. American Railcar Industries designs, manufactures, and sells hopper and tank railcars in North America. Shares of the stock have been changing hands at an unusually rapid pace, four times the rate of 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.