Comcast is laying off 634 employees at its Philadelphia headquarters, as the telecommunications and media giant pursues a cost-cutting transformation and invests in artificial intelligence. In addition to the layoffs in Pennsylvania, Comcast notified regulators that it was cutting 119 positions in New Jersey, 159 in Washington state, and 82 in California. Executives have said they are simplifying the company's structure, reducing layers of workers and expanding use of artificial intelligence agents to handle customer service.