The grades of three Diversified Telecommunication Services stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

CenturyLink (NYSE:CTL) is progressing from last week’s rating of B (“buy”) as the company improves to an A (“strong buy”) this 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.

tw telecom (NASDAQ:TWTC) boosts its rating from a B to an A this week. TW Telecom is a national provider of managed network services that specializes in Ethernet and data networking, Internet access, local and long distance voice, VPN, VoIP and network security services. Shares of TWTC have increased 5.8% over the past month, better than the 2.7% increase the Nasdaq has seen over the same period of time. For more information, get Portfolio Grader’s complete analysis of TWTC stock.

The rating of City Telecom (NASDAQ:CTEL) moves up this week, rising from a B to an A. City Telecom provides fixed telecommunications networks and international telecommunications services for residential and corporate customers. Wall Street has pushed the stock higher by 16.9% over the past month. The stock’s trailing PE Ratio is 5.3. For more information, get Portfolio Grader’s complete analysis of CTEL 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.