S usan Ocampo's wealth is derived from her family's stake in Unilab, the largest pharmaceutical company in the Philippines. The company was founded by her late father, Jose Y. Campos, who was a close associate of the former Philippine president, Ferdinand Marcos. He built Unilab into a dominant player in the Philippine pharmaceutical market, with a strong focus on producing affordable generic drugs.

Upon her father's death, his stake in the privately held company was passed down to his family. While other family members are more involved in the management of the company, Susan's inherited stake makes her a billionaire. The family's vast fortune is derived from their ownership of this massive and highly successful pharmaceutical enterprise. The family is also known for being extremely private and media-shy.