The ratings of 6 Diversified Telecommunication Services stocks are down this week, according to the Portfolio Grader database. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

SBA Communications Corporation’s (SBAC) rating weakens this week, dropping to a D versus last week’s C. SBA Communications Corporation owns and operates wireless communications infrastructure in the United States. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of SBAC stock.

China Telecom Corp. Ltd. Sponsored ADR Class H (CHA) is having a tough week. The company’s rating falls from a C to a D. China Telecom Corp. Ltd. Sponsored ADR Class H is an integrated information service provider that offers telecommunications services, including wireline voice services, mobile voice services, and Internet access services. For more information, get Portfolio Grader’s complete analysis of CHA stock.

CenturyLink, Inc. (CTL) experiences a ratings drop this week, going from last week’s B to a D. CenturyLink, Inc. is an integrated communications company engaged mainly in providing communications services, Internet and broadband services. For more information, get Portfolio Grader’s complete analysis of CTL stock.

This week, Cincinnati Bell Inc. (CBB) drops from a C to a D rating. Cincinnati Bell Inc. is a full-service regional provider of data and voice communications services and equipment that operate over wireline and wireless networks. The company also gets F’s in earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CBB stock.

China Unicom (Hong Kong) Limited Sponsored ADR (CHU) declines this week from a D to a F. China Unicom (Hong Kong) Limited Sponsored ADR provides telecommunications services in the People’s Republic of China. The company also gets F’s in sales growth, operating margin growth, earnings growth, earnings revisions, earnings surprise, and earnings momentum. For more information, get Portfolio Grader’s complete analysis of CHU stock.

This is a rough week for Telecom Italia S.p.A. Sponsored ADR (TI). The company’s rating falls to F from the previous week’s D. Telecom Italia S.p.A. Sponsored ADR is engaged in communications, particularly in fixed and mobile national and international telecommunications, television and office products. The company also gets F’s in sales growth. For more information, get Portfolio Grader’s complete analysis of TI 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.