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.

Key Takeaways Comcast's broadband customers declined more than anticipated, sending shares plunging.The customer drop of 139,000 was worse than what Comcast Cable CEO Dave Watson warned would be lost last month.