The ratings of three Semiconductor stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Advanced Semiconductor Engineering (NYSE:ASX) is on the decline this week, earning a D (“sell”) after receiving a C (“hold”) last week. Advanced Semiconductor Engineering is an independent provider of semiconductor packaging and testing services. To get an in-depth look at ASX, get Portfolio Grader’s complete analysis of ASX stock.

Fairchild Semiconductor (NYSE:FCS) earns an F (“strong sell”) this week, moving down from last week’s grade of D (“sell”). Fairchild Semiconductor International is a global supplier of high performance products that minimize, convert, manage and distribute power for multiple end markets. The stock gets F’s in Earnings Momentum, Earnings Revisions, Margin Growth, and Sales Growth. The stock has a trailing PE Ratio of 77.70. For more information, get Portfolio Grader’s complete analysis of FCS stock.

Ultra Clean Holdings (NASDAQ:UCTT) gets weaker ratings this week as last week’s D drops to an F. Ultra Clean Holdings is a developer and supplier of critical subsystems, mainly for the semiconductor capital equipment industry. The stock gets F’s in Earnings Growth, Earnings Momentum, and Earnings Revisions. For a full analysis of UCTT 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.