The grades of 4 Commercial Services & Supplies stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Waste Connections, Inc.’s (WCN) ratings are looking better this week, moving up to a A from last week’s B. Waste Connections, Inc. is an integrated solid waste services company that provides solid waste collection, transfer, disposal and recycling services in mostly secondary markets in the western and southern United States. The company also gets A’s in sales growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of WCN stock.

ABM Industries Incorporated (ABM) improves from a B to a A rating this week. ABM Industries Incorporated is a facility services contractor that provides janitorial, parking, security, and engineering services for commercial, industrial, institutional, and retail facilities. The company also gets A’s in earnings surprise and earnings momentum. For more information, get Portfolio Grader’s complete analysis of ABM stock.

Ritchie Bros. Auctioneers Incorporated (RBA) boosts its rating from a C to a B this week. Ritchie Bros. Auctioneers Incorporated operates as an industrial auctioneer that sells through unreserved public auctions. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of RBA stock.

This week, Kimball International, Inc. Class B’s (KBAL) ratings are up from a C last week to a B. The company also gets A’s in operating margin growth and return on equity. For more information, get Portfolio Grader’s complete analysis of KBAL 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.