Three Diversified Telecommunication Services stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

CenturyLink (NYSE:CTL) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. CenturyLink is an integrated communications company engaged mainly in providing communications services, Internet and broadband services. In Portfolio Grader’s specific subcategory of Earnings Momentum, CTL also gets an A. At present, the stock has a dividend yield of 2.9%. For more information, get Portfolio Grader’s complete analysis of CTL stock.

Cbeyond (NASDAQ:CBEY) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Cbeyond provides managed IT-based communications services to small businesses in metropolitan areas across the United States. Shares of CBEY have increased 17.9% over the past month, better than the 1.7% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of CBEY stock.

Primus Telecommunications‘s (NYSE:PTGI) ratings are looking better this week, moving up to an A from last week’s B. Primus Telecommunications Group offers international and domestic voice, voice-over-Internet protocol, Internet, wireless, data and hosting services to business and residential retail customers and other carriers located in North America, Australia, and Europe. Shares of the company have risen 19.8% from a month ago. For more information, get Portfolio Grader’s complete analysis of PTGI 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.