This week, 4 Commercial Services & Supplies stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

This week, Copart, Inc. (CPRT) pushes up from a B to a A rating. 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 earnings revisions and return on equity. For more information, get Portfolio Grader’s complete analysis of CPRT stock.

Knoll, Inc. (KNL) boosts its rating from a C to a B this week. Knoll, Inc. designs and manufactures branded office furniture products and textiles. The company also gets A’s in operating margin growth and return on equity. For more information, get Portfolio Grader’s complete analysis of KNL stock.

Ecology and Environment, Inc. Class A (EEI) improves from a B to a A rating this week. Ecology and Environment, Inc. Class A is a global broad-based environmental consulting firm. For more information, get Portfolio Grader’s complete analysis of EEI stock.

TRC Companies, Inc. (TRR) shows solid improvement this week. The company’s rating rises from a C to a B. TRC Companies, Inc. provides engineering, consulting, and construction management services. The company also gets A’s in operating margin growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of TRR 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.