The overall ratings of seven Semiconductor stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Kulicke & Soffa’s (NASDAQ:KLIC) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Kulicke & Soffa designs, manufactures, and markets capital equipment, related spare parts, and packaging materials used to assemble semiconductor devices. In Portfolio Grader’s specific subcategory of Earnings Revisions, KLIC also gets an F. For a full analysis of KLIC stock, visit Portfolio Grader.

The rating of NeoPhotonics Corp. (NYSE:NPTN) slips from a C to a D. 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. For more information, get Portfolio Grader’s complete analysis of NPTN stock.

ASM (NASDAQ:ASMI) gets weaker ratings this week as last week’s C drops 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. To get an in-depth look at ASMI, get Portfolio Grader’s complete analysis of ASMI stock.

This week, Skyworks Solution’s (NASDAQ:SWKS) rating worsens to a D from the company’s C rating a week ago. Skyworks Solutions is an innovator of analog and mixed-signal semiconductors. The stock price has fallen 7.8% over the past month, worse than the 1.3% decrease the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of SWKS stock.

RF Micro Devices’ (NASDAQ:RFMD) rating weakens this week, dropping to a D versus last week’s C. RF Micro Devices designs, develops, and markets proprietary radio frequency integrated circuits. The stock gets F’s in Equity and Margin Growth. For a full analysis of RFMD stock, visit Portfolio Grader.

Silicon Laboratorie (NASDAQ:SLAB) earns a D this week, falling from last week’s grade of C. 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 rates an F in Earnings Momentum. The stock currently has a trailing PE Ratio of 26.30. To get an in-depth look at SLAB, get Portfolio Grader’s complete analysis of SLAB stock.

MaxLinea (NYSE:MXL) experiences a ratings drop this week, going from last week’s C to a D. MaxLinear provides integrated, radio-frequency analog and mixed-signal semiconductor solutions for broadband communications applications. The stock also gets an F in Equity. For a full analysis of MXL stock, visit Portfolio Grader.

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.