The overall ratings of three chemicals stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

H.B. Fuller Company (FUL) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. H. B. Fuller manufactures and markets adhesives, sealants, coatings, paints, and other specialty chemical products worldwide. In Portfolio Grader’s specific subcategory of Earnings Surprise, FUL also gets an F. The stock has a trailing PE Ratio of 25.20. To get an in-depth look at FUL, get Portfolio Grader’s complete analysis of FUL stock.

This week, Monsanto Company’s (MON) rating worsens to a D from the company’s C rating a week ago. Monsanto provides agricultural products for farmers. For more information, get Portfolio Grader’s complete analysis of MON stock.

Stepan Company (SCL) earns a D this week, falling from last week’s grade of C. Stepan Company produces specialty and intermediate chemicals that are sold to other manufacturers. The stock price has fallen 5.3% over the past month, worse than the 1.7% decrease the S&P 500 has seen over the same period of time. For a full analysis of SCL stock, visit Portfolio Grader.

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.