Who manufactures costco's kirkland brand infant formula?

I am currently using sam's club (members mark) infant formula. It is made by pbm products. I know that target, meijer's, krogers's,parents's choice(walmart), and bright beginings are all made by pbm. I was just curious who made kirland's formula. I have tried looking online but i get no answers. I also have a membership there and was wondering if i could use theirs too. If you use and have a can it should say on it.