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

CF Industries’ (NYSE:CF) grade is moving up to a B (“buy”) this week from last week’s C (“hold”). CF Industries manufacturers and distributes nitrogen and phosphate fertilizer products in North America. In Portfolio Grader’s specific subcategories of Equity and Cash Flow, CF also gets A’s. The stock currently has a trailing PE Ratio of 7.50. For more information, get Portfolio Grader’s complete analysis of CF stock.

Agrium (NYSE:AGU) boosts its rating from a C to a B this week. Agrium is a major retail supplier of agricultural products and services in the Americas, as well as a global producer and marketer of agricultural nutrients and industrial products. For more information, get Portfolio Grader’s complete analysis of AGU stock.

International Flavors & Fragrances (NYSE:IFF) improves from a C to a B rating this week. International Flavors & Fragrances creates, manufactures, and supplies flavors and fragrances for the food, beverage, personal care and household products industries. For more information, get Portfolio Grader’s complete analysis of IFF 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.