Three machinery stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded 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.

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. The stock price has risen 12.9% over the past month, better than the 1.7% decrease the S&P 500 has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of WBC stock.

American Railcar Industries, Inc. (ARII) boosts its rating from a C to a B this week. American Railcar Industries designs, manufactures, and sells hopper and tank railcars in North America. Wall Street seems to agree with the upgrade and has propelled the stock up 44% over the past month. 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.