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He doesn’t own it. He has an exclusive license to use it in art. Surrey NanoSystems Limited owns the patent on VantaBlack. Stuart Semple was so angry that Kapoor received that license that he had a blacker black material created and licensed it to anyone but Kapoor. When Kapoor obtained a sample anyway, Semple had a still blacker material created, to spite him.
https://www.theguardian.com/artanddesign/shortcuts/2019/aug/05/black-30-anish-kapoor-and-the-art-worlds-pettiest-funniest-dispute