The ratings of 11 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”).

This week, NXP Semiconductors NV (NXPI) drops from a C to a D rating. NXP Semiconductors NV provides mixed signal and standard product solutions for radio frequency (RF), analog, power management, interface, security, and digital processing products worldwide. The company also gets F’s in earnings growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of NXPI stock.

Qorvo, Inc. (QRVO) earns a D this week, moving down from last week’s grade of C. The company also gets F’s in operating margin growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of QRVO stock.

Cavium, Inc. (CAVM) is having a tough week. The company’s rating falls from a D to a F. Cavium, Inc. designs, develops and markets semiconductor processors for intelligent and secure networks. For more information, get Portfolio Grader’s complete analysis of CAVM stock.

This is a rough week for Tessera Technologies, Inc. (TSRA). The company’s rating falls to D from the previous week’s C. Tessera Technologies, Inc. invests in, licenses and delivers miniaturization technologies for electronic devices. For more information, get Portfolio Grader’s complete analysis of TSRA stock.

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 operating margin growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of DIOD stock.

JinkoSolar Holding Co., Ltd. Sponsored ADR’s (JKS) rating weakens this week, dropping to a D versus last week’s C. JinkoSolar Holding Co., Ltd. Sponsored ADR produces silicon wafers, solar cells, and solar modules. For more information, get Portfolio Grader’s complete analysis of JKS stock.

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

ON Semiconductor Corporation (ON) experiences a ratings drop this week, going from last week’s C to a D. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of ON stock.

JA Solar Holdings Co., Ltd. Sponsored ADR (JASO) gets weaker ratings this week as last week’s C drops to a D. JA Solar Holdings Co., Ltd. Sponsored ADR is engaged in the design, manufacture, and marketing of high-performance solar cells, which are made from specially processed silicon wafers. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of JASO stock.

Slipping from a C to a D rating, AIXTRON SE Sponsored ADR (AIXG) takes a hit this week. AIXTRON SE Sponsored ADR provides deposition equipment, such as that used in lighting, fiber optic communication systems, and mobile telephone applications, to the semiconductor industry. The company also gets F’s in sales growth and earnings surprise. For more information, get Portfolio Grader’s complete analysis of AIXG stock.

Sunworks, Inc. (SUNW) declines this week from a C to a D. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. 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.