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

Post Holdings, Inc. (POST) is bettering its rating of C (“hold”) from last week to a B (“buy”) this week. Post Holdings manufactures, markets and distributes branded ready-to-eat cereals in the U.S. and Canada. In Portfolio Grader’s specific subcategories of Earnings Revisions and Sales Growth, POST also gets A’s. The stock price has risen 11.3% over the past month, better than the 1.7% decrease the S&P 500 has seen over the same period of time. Shares of the stock have been changing hands at an unusually rapid pace, four times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of POST stock.

This week, Westway Group (WWAY) pushes up from a C to a B rating. Westway Group provides bulk liquid storage and related value-added services worldwide. For more information, get Portfolio Grader’s complete analysis of WWAY stock.

Chiquita Brands International, Inc. (CQB) earns a B this week, jumping up from last week’s grade of C. Chiquita is an international marketer and distributor of bananas and other fresh produce. Wall Street has pushed the stock higher by 16.8% over the past month. Shares of the stock have been trading at an exceptionally rapid pace, up twofold from the week prior. For more information, get Portfolio Grader’s complete analysis of CQB 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.