The grades of 3 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”).

Knoll, Inc. (KNL) shows solid improvement this week. The company’s rating rises from a C to a B. Knoll, Inc. designs and manufactures branded office furniture products and textiles. The company also gets A’s in earnings revisions, earnings surprise, and return on equity. For more information, get Portfolio Grader’s complete analysis of KNL stock.

This week, CECO Environmental Corp.’s (CECE) ratings are up from a B last week to a A. CECO Environmental Corp. provides air-pollution control technology products and services worldwide. The company also gets A’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of CECE stock.

Avalon Holdings Corporation Class A (AWX) boosts its rating from a C to a B this week. Avalon Holdings Corporation Class A provides waste management services to industrial, commercial, municipal and governmental customers in selected northeastern and midwestern United States. The company also gets A’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of AWX 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.