This week, the ratings of seven semiconductor stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Kulicke & Soffa Industries, Inc. (KLIC) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Kulicke & Soffa designs, manufactures, and markets capital equipment, related spare parts, and packaging materials used to assemble semiconductor devices. KLIC also rates an F in Portfolio Grader’s specific subcategory of Earnings Revisions. For a full analysis of KLIC stock, visit Portfolio Grader.

NeoPhotonics Corporation (NPTN) earns a D this week, falling from last week’s grade of C. NeoPhotonics designs, manufacturers, and markets standard and semi custom planar light wave circuits for metro access and other advanced optical communications platforms. In Earnings Revisions, Equity, Cash Flow and Margin Growth the stock gets F’s. The stock price has fallen 20.1% over the past month, worse than the 1.7% decrease the S&P 500 has seen over the same period of time. To get an in-depth look at NPTN, get Portfolio Grader’s complete analysis of NPTN stock.

ASM International NV NY Registered Shs (ASMI) experiences a ratings drop this week, going from last week’s C to a D. ASM is a semiconductor capital equipment supplier engaged in the design, manufacture, and sale of production systems and services for the production of semiconductor devices or integrated circuits. The stock gets F’s in Earnings Growth, Earnings Momentum and Earnings Revisions. Earnings Surprise and Margin Growth also get F’s. For more information, get Portfolio Grader’s complete analysis of ASMI stock.

The rating of Skyworks Solutions, Inc. (SWKS) slips from a C to a D. Skyworks Solutions is an innovator of analog and mixed-signal semiconductors. For a full analysis of SWKS stock, visit Portfolio Grader.

The rating of RF Micro Devices, Inc. (RFMD) declines this week from a C to a D. RF Micro Devices designs, develops, and markets proprietary radio frequency integrated circuits. The stock gets F’s in Equity and Margin Growth. To get an in-depth look at RFMD, get Portfolio Grader’s complete analysis of RFMD stock.

This week, Silicon Laboratorie (SLAB) drops from a C to a D rating. Silicon Laboratories designs and develops proprietary, analog-intensive and mixed-signal integrated circuits that can be used in a range of applications. The stock also gets an F in Earnings Momentum. The stock’s trailing PE Ratio is 30.80. For a full analysis of SLAB stock, visit Portfolio Grader.

MaxLinear, Inc. Class A (MXL) earns a D this week, moving down from last week’s grade of C. MaxLinear provides integrated, radio-frequency analog and mixed-signal semiconductor solutions for broadband communications applications. The stock also gets an F in Equity. To get an in-depth look at MXL, get Portfolio Grader’s complete analysis of MXL 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.