AT&T has too many employees, or
AT&T have to many employees.
GE buys large amounts of paper, or
GE buy large amounts of paper
They are both correct :)
It entirely depends on if the company wants to be represented as a 'singular entity' or a more like a team.
Some like the plural some the singular.
It's like "team". Some say 'the team is dead'
some say 'the team are dead' when they want to emphasize disitinct members.