SPRING is an accelerator program that provides finance, world-class mentors, and technical expertise to businesses that can improve the lives of adolescent girls. SPRING mentors are crucial to the success of businesses that are part of the SPRING Accelerator, providing strategic growth advice from planning to prototyping and right through to market access. The SPRING accelerator ran from July 2014 to September 2019. During the 5 years of its duration, SPRING has supported 75 businesses in reaching 2,535,214 adolescent girls in 9 countries across East Africa (Ethiopia, Tanzania, Kenya, Uganda, and Rwanda) and South Asia (Bangladesh, Pakistan, Nepal, and Myanmar). SPRING was funded by the Foreign, Commonwealth & Development Office (FCDO), the U.S. Agency for International Development (USAID), and the Australian Department of Foreign Affairs and Trade (DFAT), with full support from the Nike Foundation in the first 4 years, and advisory support from Girl Effect in the design phase.