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”).

Windstream Holdings, Inc. (WIN) is making progress this week as its rating of C (“hold”) from last week increases to a B (“buy”) rating this week. Windstream is a company that provides communications and technology solutions, including high-speed Internet access, digital television services, and voice services. In Portfolio Grader’s specific subcategory of Equity, WIN also gets an A. For more information, get Portfolio Grader’s complete analysis of WIN stock.

Frontier Communications Corporation Class B (FTR) is making headway this week, with the company’s rating improving to an A (“strong buy”) from a B (“buy”) last week. Frontier Communications provides communications services to residential and business customers in rural areas and small and medium-sized towns and cities in the United States. For more information, get Portfolio Grader’s complete analysis of FTR stock.

This week, Lumos Networks Corp.’s (LMOS) ratings are up from a C last week to a B. Lumos Networks is a fiber-based service provider in the Mid-Atlantic region serving carrier, business and residential customers over a dense fiber network offering data, voice and IP services. For more information, get Portfolio Grader’s complete analysis of LMOS 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.