Cyrus S. Poonawalla is an Indian billionaire businessman, and the chairman and managing director of the Cyrus Poonawalla Group, which includes the Serum Institute of India, an Indian biotech company which is the largest vaccine manufacturer in the world and Poonawalla Fincorp a leading NBFC in India. In 2022, he is ranked as the 4th richest person in India on Forbes India rich list with a net worth of $24.3 billion. He is ranked number 1 on the Hurun Global Healthcare Rich List 2022.

Serum Institute of India (SII) is an Indian biotechnology and biopharmaceuticals company, based in Pune. It was founded by Cyrus Poonawalla in 1966 and is a part of Cyrus Poonawalla Group.