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) earns a F this week, moving down from last week’s grade of D. 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 growth, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of SYNA stock.

Mellanox Technologies, Ltd. (MLNX) slips from a C to a D this week. Mellanox Technologies, Ltd. designs and develops semiconductor-based, high-performance interconnect products. The company also gets F’s in earnings growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of MLNX stock.

Cree, Inc. (CREE) gets weaker ratings this week as last week’s C drops to a D. Cree, Inc. develops and manufactures semiconductor materials and devices. The company also gets F’s in sales growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of CREE stock.

This week, Cohu, Inc.’s (COHU) rating worsens to a D from the company’s C rating a week ago. Cohu, Inc. develops, manufactures, markets, sells, and services test handling and burn-in related equipment and thermal sub-systems for the global semiconductor industry. The company also gets F’s in operating margin growth and earnings revisions. For more information, get Portfolio Grader’s complete analysis of COHU stock.

This is a rough week for Cypress Semiconductor Corporation (CY). The company’s rating falls to D from the previous week’s C. Cypress Semiconductor Corporation is engaged in the design, development, manufacture, and marketing of high-performance, mixed-signal, programmable solutions that provide customers with rapid time-to-market and system value. The company also gets F’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of CY stock.

AIXTRON SE Sponsored ADR (AIXG) is having a tough week. The company’s rating falls from a C to a D. 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.

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.