This week, 4 Diversified Telecommunication Services stocks are worse, according to the Portfolio Graderdatabase. Each of these rates a “D” (“sell”) or “F” overall (“strong sell”).

SBA Communications Corporation (SBAC) declines this week from a C to a D. SBA Communications Corporation owns and operates wireless communications infrastructure in the United States. For more information, get Portfolio Grader’s complete analysis of SBAC stock.

pdvWireless, Inc. (PDVW) earns a F this week, moving down from last week’s grade of D. The company also gets F’s in earnings momentum. For more information, get Portfolio Grader’s complete analysis of PDVW stock.

This is a rough week for General Communication, Inc. Class A (GNCMA). The company’s rating falls to D from the previous week’s C. General Communication, Inc. Class A is a diversified telecommunications provider with a position in facilities-based long distance service in the state of Alaska. The company also gets F’s in earnings revisions and earnings surprise. For more information, get Portfolio Grader’s complete analysis of GNCMA stock.

Alaska Communications Systems Group, Inc. (ALSK) gets weaker ratings this week as last week’s D drops to a F. Alaska Communications Systems Group, Inc. provides integrated communications services primarily in Alaska. The company also gets F’s in sales growth, operating margin growth, earnings growth, and free cash flow. For more information, get Portfolio Grader’s complete analysis of ALSK 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.