I worked at a couponing business for awhile and learned that Unilever, Procter & Gamble, and Colgate-Palmolive own almost everything on the shelves in US groceries and pharmacies.
Additional fun fact: idk what the arrangement is now, but my aunt worked at a Kelloggs (incidentally not owned by one of the three above afaik) factory in the 80’s and after filling the branded boxes they’d fill the store brand boxes with the same stuff. Very likely you’re still supporting some of these companies buying store brands.