This article argues that migration and investment from India moved in tandem to chart the evolution of transnational Indian business in the twentieth century, first toward Southeast Asia and Africa and later toward the United States, Europe, and West Asia. With a focus on the banking and diamond sectors, the overseas investment project of the Aditya Birla Group, and the transnational linkages of India's one hundred richest business leaders, the article locates important events, policies, and actors before economic liberalization in 1991 that laid the foundation for subsequent globalization of Indian firms.