Comcast executives said the company's focus would shift to growing its mobile business after a bigger-than-expected loss of broadband customers. Broadband customer growth has lagged in recent quarters as competition from wireless providers has ramped up.

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.

Comcast reported a steep decline in broadband subscribers for the fourth quarter on Thursday on competition from telecom firms that have been bundling 5G mobile services with internet plans, sending its shares about 11% lower.