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

This week, Cabot Microelectronics Corporation’s (CCMP) rating worsens to a D from the company’s C rating a week ago. Cabot Microelectronics Corporation supplies high-performance polishing slurries used in the manufacture of advanced integrated circuit (IC) devices within the semiconductor industry. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of CCMP stock.

This week, Cree, Inc. (CREE) drops from a D to a F rating. Cree, Inc. develops and manufactures semiconductor materials and devices. The company also gets F’s in operating margin growth, earnings growth, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CREE stock.

SunEdison Semiconductor, Inc. (SEMI) gets weaker ratings this week as last week’s D drops to a F. The company also gets F’s in earnings growth, earnings surprise, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SEMI stock.

This is a rough week for Pixelworks, Inc. (PXLW). The company’s rating falls to D from the previous week’s C. Pixelworks, Inc. designs and develops system-on-a-chip solutions. The company also gets F’s in earnings revisions and return on equity. For more information, get Portfolio Grader’s complete analysis of PXLW 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.