Back in the day some folks discovered that the products sold by Poorboys World and Adams were actually private labeled products produced by some large chemical supplier. I almost want to say Chemical Guys was that large supplier, but I think that's incorrect.
Anyway at that time, you could buy PBW's 16oz QD+ detailer for $15 or go directly to the supplier and get the same thing (with a different scent) for $9. It caused a lot of drama at the time because you didn't have a lot of brands then.. you either had 3M/Megs/Mothers or you were trying these smaller names.
But anyway, I seem to recall that there are some brands who do have their own chemists: Sonnax, 1Z (now nextzett or something), Menzerna, FinishKare, Duragloss.