W irastuty Fangiono is an Indonesian heiress and a member of the powerful Fangiono family, which owns and runs the FAP Agri Group, a major Indonesian palm oil company. She is one of the children of the company's founder, who built the business into a significant player in one of Indonesia's most important industries. The FAP Agri Group has a large portfolio of oil palm plantations, primarily located in the Kalimantan region of Indonesia.

The company is a vertically integrated producer, with operations that span from cultivating oil palm trees to harvesting the fresh fruit bunches and processing them into crude palm oil. The family's vast fortune is derived from their ownership of this massive, privately held agribusiness empire. While other family members are more involved in the company's leadership, Wirastuty's ownership stake makes her a billionaire.