This report examines how partnerships between mainstream financial institutions (e.g., banks, insurers, and payment companies) and fintechs are addressing financial inclusion challenges and expanding access to the formal financial economy for underserved segments of the global population, particularly in emerging markets. It incorporates insights from 24 in-depth interviews with people at the frontlines of this innovation and highlights 14 partnerships focused on financial inclusion that we think exemplify best-case scenarios and good practice. Contrary to the popular narrative, financial institutions view fintechs as partners in innovation, not threats to their core business. By offering better, less expensive, and more innovative products, financial institutions can assert their continued relevance as customer-facing institutions with help from fintech partnerships.