The company had a public offering. Nothing like a sole proprietorship.
https://www.morningstar.com/stocks/xnas/roiv/financials
https://www.morningstar.com/stocks/xnas/roiv/ownership
https://www.morningstar.com/stocks/xnas/roiv/performance
Ramaswamy received the grant in 2011. Roivant went public in 2021.