Glanbia is an irish company who's whole business is based on the dairy industry (in ireland anyway) and they bought Optimum Nutrition a few years back
Kinetica is also an irish company Carbery Milk Products Limited, Ballineen, Co Cork. Ireland, they also produce various cheese products so i imagine they supply their own whey for the kinetica range
i think most protein company's import from various dairy companies and process the product or contract a large company to produce the protein to their specs