Financial data aggregation involves collecting financial information from various sources to provide a comprehensive view of an individual's or organization's financial status. This process is crucial for innovations in personal financial management tools, robo-advisors, wealth management platforms, and financial institutions by enhancing customer insights and streamlining processes such as account opening and risk assessment. The rise of open banking has amplified the importance of data aggregation, as banks are now required to share customer data with third-party services through APIs, leading to a surge in fintech innovation. Companies like Plaid, Yodlee, and Finicity play significant roles in this ecosystem by connecting thousands of financial institutions and normalizing data for use in different applications. Despite the benefits, data aggregation poses security and privacy challenges, driving the development of privacy-enhancing technologies like homomorphic encryption and secure multi-party computation to protect sensitive information while enabling data-driven innovation. As these technologies mature, financial institutions are expected to increase data sharing and collaboration, creating new business models and services while maintaining compliance and consumer trust. Duality Technologies exemplifies this trend by providing solutions that enable secure data sharing and analytics, helping financial institutions innovate and comply with regulations such as GDPR and CCPA.