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

inContact, Inc.’s (SAAS) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. inContact provides cloud-based contact center software services and network connectivity in the United States. In Portfolio Grader’s specific subcategories of Earnings Revisions and Equity, SAAS also gets F’s. For more information, get Portfolio Grader’s complete analysis of SAAS stock.

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

This week, Premiere Global Services, Inc. (PGI) drops from a C to a D rating. Premiere Global Services is a global provider of conferencing and collaboration services. The stock also gets an F in Earnings Momentum. Shares of the stock are changing hands at twice the rate they were a week ago. The stock currently has a trailing PE Ratio of 38.90. For more information, get Portfolio Grader’s complete analysis of PGI 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.