This week, the overall grades of 7 Semiconductors & Semiconductor Equipment stocks are lower, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Diodes Incorporated (DIOD) slips from a C to a D this week. Diodes Incorporated designs, makes, and supplies high-quality, application-specific standard products within the discrete and analog semiconductor markets, as well as in the consumer electronics, computing, communications, industrial, and automotive markets. The company also gets F’s in earnings revisions. For more information, get Portfolio Grader’s complete analysis of DIOD stock.

Veeco Instruments Inc. (VECO) declines this week from a D to a F. Veeco Instruments Inc. manufactures equipment for light emitting diodes and solar panels. 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 VECO stock.

Advantest Corp. Sponsored ADR (ATE) earns a F this week, moving down from last week’s grade of D. Advantest Corp. Sponsored ADR manufactures and sells semiconductor and component test system products, and mechatronics-related 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 ATE stock.

This week, MagnaChip Semiconductor Corporation’s (MX) rating worsens to a D from the company’s C rating a week ago. MagnaChip Semiconductor Corporation designs, develops, and manufactures mixed-signal and digital multimedia semiconductors. The company also gets F’s in earnings growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of MX stock.

Kopin Corporation (KOPN) experiences a ratings drop this week, going from last week’s C to a D. Kopin Corporation develops and manufactures semiconductor materials and small form factor displays. The company also gets F’s in return on equity. For more information, get Portfolio Grader’s complete analysis of KOPN stock.

This week, United Microelectronics Corp. Sponsored ADR (UMC) drops from a C to a D rating. United Microelectronics Corp. Sponsored ADR is a semiconductor wafer foundry that provides wafer fabrication services and technologies. The company also gets F’s in earnings surprise. For more information, get Portfolio Grader’s complete analysis of UMC stock.

QuickLogic Corporation (QUIK) is having a tough week. The company’s rating falls from a D to a F. QuickLogic Corporation is the inventor and provider of customizable semiconductor solutions for mobile and portable electronics. The company also gets F’s in sales growth, earnings revisions, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of QUIK 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.