Comcast Stock Is Downgraded to Sell. Why the Trouble Runs Deep. — Barrons.com

By Mariapaula GonzalezComcast has faced serious headwinds and the trouble extends far beyond a competitive broadband market.Shares of Comcast fell 2.1% to $21.66 in premarket trading Friday after KeyBanc analysts downgraded the stock to Underweight, the equivalent of a Sell rating, from Sector Weig…