The grades of 7 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”).

Copart, Inc. (CPRT) improves from a C to a B rating this week. Copart, Inc. provides online auctions and vehicle remarketing services in the United States, Canada, and the United Kingdom. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of CPRT stock.

ADT Corporation’s (ADT) ratings are looking better this week, moving up to a B from last week’s C. ADT Corporation provides electronic security, interactive home and business automation and alarm monitoring services industry in the U.S. and Canada. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of ADT stock.

This is a strong week for Acme United Corporation (ACU). The company’s rating climbs to B from the previous week’s C. Acme United Corporation supplies cutting, measuring, and safety products for the school, home, office, and industrial markets. The company also gets A’s in free cash flow. For more information, get Portfolio Grader’s complete analysis of ACU stock.

InnerWorkings, Inc. (INWK) boosts its rating from a C to a B this week. InnerWorkings, Inc. provides print procurement solutions to corporate clients in the United States. The company also gets A’s in operating margin growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of INWK stock.

This week, Virco Mfg. Corporation’s (VIRC) ratings are up from a B last week to a A. Virco Mfg. Corporation is a manufacturer of moveable educational furniture and equipment for the preschool through 12th grade market in the United States. The company also gets A’s in earnings growth, earnings revisions, and free cash flow. For more information, get Portfolio Grader’s complete analysis of VIRC stock.

The rating of Cemtrex, Inc. (CETX) moves up this week, rising from a C to a B. The company also gets A’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of CETX stock.

MagneGas Corporation (MNGA) gets a higher grade this week, advancing from a B last week to a A. The company also gets A’s in sales growth. For more information, get Portfolio Grader’s complete analysis of MNGA 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.