To try to dispel the myth of a "coop" being defined as four old hippies sorting groceries in the back room of their run down victorian house in Portland:

The Mondragon Corporation is a corporation and federation of worker cooperatives based in the Basque region of Spain

https://en.wikipedia.org/wiki/Mondragon_Corporation

Often touted as "the worlds largest coop".

Like any large entity, it's had it's share of criticism as well as praise. But in general, works to the advantage of it's workers, not just for shareholder returns.