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

Intel‘s (NASDAQ:INTC) rating falls this week to a F (“strong sell”), down from last week’s D (“sell”). Intel designs, manufactures, and sells computer components and related products. For Portfolio Grader’s specific subcategory of Earnings Surprise, INTC also gets an F. The stock price has fallen 6.7% over the past month, worse than the 6% decrease the Nasdaq has seen over the same period of time. For a full analysis of INTC stock, visit Portfolio Grader.

Alpha & Omega Semiconducto‘s (NASDAQ:AOSL) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Alpha & Omega Semiconductor designs, develops, and supplies a range of power semiconductors worldwide. The stock also gets an F in Margin Growth. Wall Street appears to agree with the stock downgrade, with share prices dropping 16% over the past month. For more information, get Portfolio Grader’s complete analysis of AOSL stock.

Pericom Semiconductor (NASDAQ:PSEM) earns a F this week, falling from last week’s grade of D. Pericom Semiconductor designs, develops, and markets interface integrated circuits for the transfer, routing, and timing of high-speed digital and analog signals. The stock receives F’s in Earnings Growth, Earnings Revisions, Margin Growth, and Sales Growth. Investors seem to agree with the downgrade and have pushed down the share price 15% over the past month. To get an in-depth look at PSEM, get Portfolio Grader’s complete analysis of PSEM 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.