The grades of four commercial services stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

This week, SP Plus Corporation (SP) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). In Portfolio Grader’s specific subcategories of Earnings Momentum and Sales Growth, SP also gets A’s. For more information, get Portfolio Grader’s complete analysis of SP stock.

This week, EnerNOC, Inc. (ENOC) pushes up from a C to a B rating. EnerNOC develops and provides clean and intelligent power solutions to commercial, institutional and industrial customers, as well as electric power grid operators and utilities. For more information, get Portfolio Grader’s complete analysis of ENOC stock.

US Ecology, Inc. (ECOL) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. US Ecology provides radioactive, hazardous, polychlorinated biphenyls and non-hazardous industrial waste management and recycling services to commercial and government entities, such as refineries and chemical production facilities. For more information, get Portfolio Grader’s complete analysis of ECOL stock.

Kimball International, Inc. Class B (KBALB) earns a B this week, jumping up from last week’s grade of C. Kimball International manufactures consumer durable goods, including office, residential, hospitality, and healthcare furniture. For more information, get Portfolio Grader’s complete analysis of KBALB 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.