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's revenue and profit rose last quarter, powered partly by the release of blockbuster movie "Wicked,” despite falling broadband customer numbers. Comcast lost 139,000 broadband customers in the quarter,