This week, four packaged foods stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

Post Holdings, Inc.’s (POST) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). 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. Shares of the stock have been changing hands at an unusually rapid pace, up 536.5% from the week prior. For more information, get Portfolio Grader’s complete analysis of POST stock.

Westway Group’s (WWAY) ratings are looking better this week, moving up to a B from last week’s C. Westway Group provides bulk liquid storage and related value-added services worldwide. For more information, get Portfolio Grader’s complete analysis of WWAY stock.

This week, Pinnacle Foods, Inc. (PF) is showing good progress as the company’s rating jumps from a B (“buy”) last week to an A (“strong buy”). For more information, get Portfolio Grader’s complete analysis of PF stock.

Chiquita Brands International, Inc. (CQB) shows solid improvement this week. The company’s rating rises from a C to a B. Chiquita is an international marketer and distributor of bananas and other fresh produce. 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.