Enlarge / An AT&T sign and logo on Main Street during the Sundance Film Festival on January 23, 2020 in Park City, Utah. (credit: Getty Images | Mat Hayward) AT&T's WarnerMedia division is planning to lay off hundreds of employees in AT&T's latest cost-cutting move. "Warner Bros. is expected to commence layoffs of around 650 people starting Monday, according to people familiar with the matter, while HBO is seen shedding between 150 and 175 staffers.