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

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

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

CyberOptics Corporation (CYBE) earns a D this week, moving down from last week’s grade of C. CyberOptics Corporation designs, manufactures, and markets optical process control sensors and inspection systems that enable the electronics and semiconductor industries to meet quality demands for printed circuit boards and semiconductor wafer transport. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of CYBE stock.

SunEdison, Inc. (SUNE) slips from a D to a F this week. SunEdison, Inc. develops, manufactures, and sells silicon wafers. The company also gets F’s in earnings surprise, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of SUNE 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.