For the current week, the overall ratings of three Diversified Telecommunication Services stocks are worse, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

Nippon Telegraph & Telephone’s (NYSE:NTT) rating falls to a D (“sell”) this week, down from C (“hold”) the week prior. Nippon Telegraph & Telephone provides a variety of telecommunication services, including telephone, telegraph, leased circuits, data communication, terminal equipment sales, and related services. For more information, get Portfolio Grader’s complete analysis of NTT stock.

The rating of Lumos Networks Corp (NASDAQ:LMOS) slips from C to a D. Lumos Networks Corp. is a fiber-based network service provider in the Mid-Atlantic region. The company serves a wide range of customers, including telecommunication carriers, enterprise and other business customers and residential customers over a dense fiber network offering data, voice, and IP bas… The stock gets F’s in Cash Flow and Margin Growth. To get an in-depth look at LMOS, get Portfolio Grader’s complete analysis of LMOS stock.

This is a rough week for Maxcom Telecomunicaciones (NYSE:MXT). The company’s rating falls to D from the previous week’s C. Maxcom Telecomunicaciones offers local and long distance telephone services to residences and small to medium-sized businesses, as well as conference calling, data transmission, and high-speed Internet access. The stock gets F’s in Equity, Cash Flow, and Sales Growth. For a full analysis of MXT stock, visit Portfolio Grader.

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.