This week, the ratings of 11 internet and web service stocks on Portfolio Grader are down. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Youku Tudou, Inc. Sponsored ADR Class A’s (YOKU) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). Youku Tudou is an Internet television company. To get an in-depth look at YOKU, get Portfolio Grader’s complete analysis of YOKU stock.

Marchex, Inc. Class B (MCHX) earns an F this week, moving down from last week’s grade of D. Marchex offers call-based advertising and related services, pay-per-click advertising and related services and proprietary traffic sources. The stock receives F’s in Earnings Growth, Earnings Momentum and Earnings Surprise. Equity and Cash Flow also get F’s. The trailing PE Ratio for the stock is 36.20. For more information, get Portfolio Grader’s complete analysis of MCHX stock.

This week, Unwired Planet, Inc. (UPIP) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Unwired Planet develops patents that allow mobile devices to connect to the Internet. The stock gets F’s in Earnings Revisions and Equity. To get an in-depth look at UPIP, get Portfolio Grader’s complete analysis of UPIP stock.

ChinaCache International Holdings Ltd. Sponsored ADR (CCIH) earns a D this week, falling from last week’s grade of C. ChinaCache International provides a portfolio of services and solutions to businesses, government agencies and other enterprises to enhance the reliability and scalability of their online services and applications and improve end-user experience. For more information, get Portfolio Grader’s complete analysis of CCIH stock.

Slipping from a D to an F rating, E2open, Inc. (EOPN) takes a hit this week. E2open develops and deploys enterprise software cloud solutions for businesses. The stock gets F’s in Equity and Cash Flow. To get an in-depth look at EOPN, get Portfolio Grader’s complete analysis of EOPN stock.

This week, iPass (IPAS) drops from a D to an F rating. iPass offers enterprise mobility services on a global basis by providing services that simply, smartly and openly facilitate network access from mobile devices while providing the enterprise with visibility and control over their mobile ecosystem. The stock receives F’s in Earnings Revisions, Equity, Cash Flow and Sales Growth. For more information, get Portfolio Grader’s complete analysis of IPAS stock.

The rating of Velti (VELT) declines this week from a D to an F. Velti is a global provider of mobile marketing and advertising solutions. The stock gets F’s in Earnings Growth and Earnings Momentum. To get an in-depth look at VELT, get Portfolio Grader’s complete analysis of VELT stock.

Travelzoo (TZOO) earns an F this week, moving down from last week’s grade of D. Travelzoo is an Internet media company that publishes travel and entertainment deals from travel and entertainment companies, and local businesses in North America, Europe, and the Asia Pacific. The stock gets F’s in Earnings Growth, Earnings Revisions and Sales Growth. For more information, get Portfolio Grader’s complete analysis of TZOO stock.

This week, Zix Corporation (ZIXI) drops from a C to a D rating. Zix provides secure, Internet-based applications in a Software-as-a-Service (SaaS) model. The stock gets F’s in Earnings Growth, Earnings Momentum and Earnings Surprise. The stock’s trailing PE Ratio is 56.00. To get an in-depth look at ZIXI, get Portfolio Grader’s complete analysis of ZIXI stock.

This week, CoStar Group, Inc.’s (CSGP) rating worsens to a D from the company’s C rating a week ago. CoStar provides information and analytic services to the commercial real estate industry in the United States, the United Kingdom, and France. The stock also rates an F in Earnings Momentum. For more information, get Portfolio Grader’s complete analysis of CSGP stock.

Coupons.com Inc.’s (COUP) rating weakens this week, dropping to a D versus last week’s C. The stock gets F’s in Earnings Revisions and Equity. As of Sept. 4, 2015, 16% of outstanding Coupons.com Inc. shares were held short. To get an in-depth look at COUP, get Portfolio Grader’s complete analysis of COUP 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.