For the current week, the overall ratings of three diversified telecommunication services stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This week, Premiere Global Services, Inc. (PGI) falls to a D (“sell”), worse than last week’s grade of C (“hold”). Premiere Global Services is a global provider of conferencing and collaboration services. PGI also rates an F in Portfolio Grader’s specific subcategory of Earnings Momentum. The stock’s trailing PE Ratio is 30.90. For more information, get Portfolio Grader’s complete analysis of PGI stock.

inContact, Inc.’s (SAAS) rating weakens this week, dropping to a D versus last week’s C. inContact provides cloud-based contact center software services and network connectivity in the United States. The stock gets F’s in Earnings Revisions and Equity. For a full analysis of SAAS stock, visit Portfolio Grader.

KT Corporation Sponsored ADR’s (KT) rating falls this week to an F (“strong sell”), down from last week’s D (“sell”). KT provides telecommunication services including local, long distance, and international calling, satellite communication, data transmission, and wireless telephone services in South Korea. In Earnings Growth, Earnings Momentum, Earnings Revisions and Margin Growth the stock gets F’s. To get an in-depth look at KT, get Portfolio Grader’s complete analysis of KT 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.