I saw this phrase in the movie LEON. Once upon a time, Leon was performing a task, and he told his target he had coming up. Then the target figure said such words his subordinates. Is it a kind of spoken language which has the same meaning as "we have got a company". Or it is a verbal expression that means "we have got our company a business."
We got company can be a slangy way of saying We are no longer alone. Does that fit your movie context?

CliveWe are no longer alone.
We've got company - usually it is the adversaries that have arrived on the scene, and battle is imminent.
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Exactly! Thank you!
 AlpheccaStars's reply was promoted to an answer.
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does it mean that we have a guest??