3 Diversified Telecommunication Services stocks are moving up in their overall rating this week, according to the Portfolio Grader database. Every one of these is graded an “A” (“strong buy”) or “B” overall (“buy”).

Cogent Communications Holdings Inc’s (CCOI) ratings are looking better this week, moving up to a B from last week’s C. Cogent Communications Holdings Inc is a facilities-based provider of low-cost, high-speed Internet access and Internet Protocol (IP) communications services. The company also gets A’s in earnings surprise, earnings momentum, and return on equity. For more information, get Portfolio Grader’s complete analysis of CCOI stock.

Chunghwa Telecom Co., Ltd Sponsored ADR (CHT) shows solid improvement this week. The company’s rating rises from a B to a A. Chunghwa Telecom Co., Ltd Sponsored ADR is a telecommunications service provider that offers fixed line services, cellular services, and Internet and data services in Taiwan and Asia. For more information, get Portfolio Grader’s complete analysis of CHT stock.

The rating of Otelco Inc. Class A (OTEL) moves up this week, rising from a C to a B. The company also gets A’s in operating margin growth and free cash flow. For more information, get Portfolio Grader’s complete analysis of OTEL 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.