This week, the overall grades of 4 Semiconductors & Semiconductor Equipment stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, First Solar, Inc. (FSLR) drops from a C to a D rating. First Solar, Inc. designs and manufactures solar modules. The company also gets F’s in earnings surprise and earnings momentum. For more information, get Portfolio Grader’s complete analysis of FSLR stock.

Axcelis Technologies, Inc. (ACLS) gets weaker ratings this week as last week’s C drops to a D. Axcelis Technologies, Inc. designs, manufactures and services ion implantation, dry strip and other processing equipment used in the fabrication of semiconductor chips in the United States, Europe and Asia. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of ACLS stock.

Xcerra Corporation’s (XCRA) rating weakens this week, dropping to a D versus last week’s C. The company also gets F’s in sales growth, operating margin growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of XCRA stock.

Intermolecular, Inc. (IMI) experiences a ratings drop this week, going from last week’s D to a F. Intermolecular, Inc. is a semiconductor and clean energy technology platform company. The company also gets F’s in earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of IMI 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.