Stack

Stack is owned by Zapi Industrie Chimiche S.p.a., headquartered in Italy. No. The ultimate owner of Stack, Zapi Industrie Chimiche S.p.a., is headquartered in Italy, not in the United States.

Zapi is a leading Italian chemical company founded in the 1970s, specializing in the research, development, and production of biocides and plant protection products for home, garden, and professional use.