3 Chemicals stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

Syngenta AG Sponsored ADR (SYT) earns a B this week, jumping up from last week’s grade of C. Syngenta AG Sponsored ADR is an agribusiness that is engaged in the discovery, development, manufacture and marketing products designed to improve crop yields and food quality. The company also gets A’s in return on equity and free cash flow. For more information, get Portfolio Grader’s complete analysis of SYT stock.

This is a strong week for Stepan Company (SCL). The company’s rating climbs to B from the previous week’s C. Stepan Company produces specialty and intermediate chemicals that are sold to other manufacturers. For more information, get Portfolio Grader’s complete analysis of SCL stock.

Core Molding Technologies, Inc. (CMT) improves from a B to a A rating this week. Core Molding Technologies, Inc. engages in the manufacture and sale of sheet molding compound (SMC) products in the United States, Canada, and Mexico. The company also gets A’s in earnings growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of CMT 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.