The overall ratings of 4 Diversified Telecommunication Services stocks are down on Portfolio Grader this week. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

This is a rough week for Verizon Communications Inc. (VZ). The company’s rating falls to D from the previous week’s C. Verizon Communications Inc. provides communication services and equipment, including wireless voice and data services, Internet access and broadband video. For more information, get Portfolio Grader’s complete analysis of VZ stock.

TELUS Corporation’s (TU) rating weakens this week, dropping to a F versus last week’s D. TELUS Corporation is a telecommunications company that offers products and services in Canada. For more information, get Portfolio Grader’s complete analysis of TU stock.

IDT Corporation Class B (IDT) slips from a C to a D this week. IDT Corporation Class B provides retail and wholesale telecommunications services and products, including pre-paid and rechargeable calling cards and wholesale carrier services. The company also gets F’s in earnings growth and earnings momentum. For more information, get Portfolio Grader’s complete analysis of IDT stock.

Windstream Holdings, Inc. (WIN) earns a F this week, moving down from last week’s grade of D. Windstream Holdings, Inc. is a company that provides communications and technology solutions, including high-speed Internet access, digital television services, and voice services. The company also gets F’s in operating margin growth, earnings growth, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of WIN 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.