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

Graphic Packaging (NYSE:GPK) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. Graphic Packaging Holding provides packaging solutions for a wide variety of products to food, beverage and other consumer products companies. In Portfolio Grader’s specific subcategories of Earnings Revisions, Earnings Surprise, Cash Flow, and Margin Growth, GPK also gets A’s. Shares of GPK have increased 6.5% over the past month, better than the 0.3% the S&P 500 has seen over the same period of time. The stock has a trailing PE Ratio of 8.80. For more information, get Portfolio Grader’s complete analysis of GPK stock.

Myers Industries’ (NYSE:MYE) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). Myers Industries manufactures plastic and rubber products for industrial, agricultural, automotive, commercial, and consumer markets. For more information, get Portfolio Grader’s complete analysis of MYE stock.

This week, Silgan Holdings’ (NASDAQ:SLGN) ratings are up from a C last week to a B. Silgan Holdings manufactures metal and plastic packing products for consumer goods. For more information, get Portfolio Grader’s complete analysis of SLGN 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.