This week, three Diversified Telecommunication Services stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

8×8 Inc. (NASDAQ:EGHT) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this week. 8×8 provides voice-over-Internet protocol creation platforms, hosted Internet PBX solutions, voice and video semiconductors, and related software. Shares of EGHT have increased 2% over the past month, better than the 4.1% decrease the Nasdaq has seen over the same period of time. The stock currently has a trailing PE Ratio of 6.10. For more information, get Portfolio Grader’s complete analysis of EGHT stock.

This week, Cogent Communications (NASDAQ:CCOI) is showing significant improvement as the company’s rating hops from a C (“hold”) to a B (“buy”). Cogent Communications is a facilities-based provider of low-cost, high-speed Internet access and Internet Protocol (IP) communications services. For more information, get Portfolio Grader’s complete analysis of CCOI stock.

Atlantic Tele-Network (NASDAQ:ATNI) is seeing ratings go up from a C last week to a B this week. Atlantic Tele-Network is a provider of wireless and wireline telecommunications services in North America and the Caribbean. For more information, get Portfolio Grader’s complete analysis of ATNI 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.