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

Reis, Inc.’s (REIS) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Reis is engaged in the business of providing commercial real estate market information and analytical tools for its customers. In Portfolio Grader’s specific subcategories of Earnings Momentum and Earnings Surprise, REIS also gets F’s. Shares of the stock have been changing hands at an unusually rapid pace, three times the rate of the week prior. For more information, get Portfolio Grader’s complete analysis of REIS stock.

The rating of Actua Corporation (ACTA) declines this week from a C to a D. The stock gets F’s in Equity and Margin Growth. To get an in-depth look at ACTA, get Portfolio Grader’s complete analysis of ACTA stock.

iPass’ (IPAS) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). 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. In Earnings Revisions, Equity, Cash Flow and Sales Growth the stock gets F’s. For more information, get Portfolio Grader’s complete analysis of IPAS stock.

Velti (VELT) gets weaker ratings this week as last week’s D drops 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.

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.