This week, the ratings of 6 Semiconductors & Semiconductor Equipment stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Synaptics Incorporated (SYNA) slips from a C to a D this week. Synaptics Incorporated is a worldwide developer and supplier of custom-designed user interface solutions for a variety of mobile computing, communications, entertainment and other electronic devices. The company also gets F’s in sales growth, earnings revisions, and earnings surprise. For more information, get Portfolio Grader’s complete analysis of SYNA stock.

This week, SolarEdge Technologies, Inc.’s (SEDG) rating worsens to a D from the company’s C rating a week ago. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of SEDG stock.

This is a rough week for Hanwha Q CELLS Co., Ltd. Sponsored ADR (HQCL). The company’s rating falls to D from the previous week’s C. The company also gets F’s in earnings surprise, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of HQCL stock.

FormFactor, Inc. (FORM) earns a D this week, moving down from last week’s grade of C. FormFactor, Inc. designs, develops, and manufactures advanced semiconductor wafer probe cards. The company also gets F’s in sales growth, earnings growth, and earnings revisions. For more information, get Portfolio Grader’s complete analysis of FORM stock.

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

Sunworks, Inc. (SUNW) experiences a ratings drop this week, going from last week’s C to a D. For more information, get Portfolio Grader’s complete analysis of SUNW 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.