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”).

WABCO Holdings (WBC) is bumping up its rating from a C (“hold”) to a B (“buy”) 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. In Portfolio Grader’s specific subcategories of Earnings Growth, Earnings Momentum, Equity, Cash Flow and Margin Growth, WBC also gets A’s. Shares of WBC have increased 18.9% 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) shows solid improvement this week. The company’s rating rises 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.

This week, Luxfer Holdings PLC Sponsored ADR (LXFR) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). Luxfer Holdings, a materials technology company, engages in the design, manufacture, and supply of materials, components, and gas cylinders. The stock has inched up 2% over the past week. For more information, get Portfolio Grader’s complete analysis of LXFR 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.