This week, the ratings of 7 Semiconductors & Semiconductor Equipment stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Ambarella, Inc. (AMBA) experiences a ratings drop this week, going from last week’s D to a F. Ambarella, Inc. develops semiconductor processing solutions for video that enable high-definition (HD) video capture, sharing, and display. The company also gets F’s in sales growth, earnings growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of AMBA stock.

Cabot Microelectronics Corporation (CCMP) declines this week from a C to a D. Cabot Microelectronics Corporation supplies high-performance polishing slurries used in the manufacture of advanced integrated circuit (IC) devices within the semiconductor industry. For more information, get Portfolio Grader’s complete analysis of CCMP stock.

Cavium, Inc. (CAVM) gets weaker ratings this week as last week’s D drops to a F. Cavium, Inc. designs, develops and markets semiconductor processors for intelligent and secure networks. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of CAVM stock.

This week, IXYS Corporation (IXYS) drops from a C to a D rating. IXYS Corporation designs, develops, and markets power semiconductors. For more information, get Portfolio Grader’s complete analysis of IXYS stock.

Sigma Designs, Inc.’s (SIGM) rating weakens this week, dropping to a D versus last week’s C. Sigma Designs, Inc. provides integrated system-on-chip solutions for the internet protocol television, connected media player, prosumer and industrial audio/video, connected home technologies and other markets. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SIGM stock.

This is a rough week for Xcerra Corporation (XCRA). The company’s rating falls to D from the previous 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.

Slipping from a D to a F rating, STMicroelectronics NV ADR RegS (STM) takes a hit this week. STMicroelectronics NV ADR RegS is a designer, developer, manufacturer and marketer of semiconductor products. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of STM 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.