Comcast shares dropped 12% Thursday morning after the company reported a loss of nearly 140,000 residential broadband customers in the fourth quarter and a stagnating subscriber base for its Peacock streaming service.

Comcast Corp. shares fell as much as 9.9% to their lowest in more than two years after the company reported fourth-quarter revenue and profit that beat Wall Street’s expectations but subscriber losses in its broadband unit raised concerns among investors.