This week, 3 Diversified Telecommunication Services stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

BT Group PLC Sponsored ADR (BT) gets weaker ratings this week as last week’s C drops to a D. BT Group PLC Sponsored ADR is a communications services company involved in the provision of fixed lines, broadband, mobile, and television products and services. For more information, get Portfolio Grader’s complete analysis of BT stock.

Lumos Networks Corp. (LMOS) declines this week from a D to a F. Lumos Networks Corp. 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. The company also gets F’s in operating margin growth, earnings growth, earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of LMOS stock.

Slipping from a D to a F rating, Telefonica SA Sponsored ADR (TEF) takes a hit this week. Telefonica SA Sponsored ADR is a telecommunications group that provides services through its telecommunications networks. The company also gets F’s in operating margin growth. For more information, get Portfolio Grader’s complete analysis of TEF 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.