US ETFs surpassed the annual flow record by the end of September, accumulating $1.5 trillion in inflows during 2025. This milestone marks a significant acceleration in capital deployment into exchange-traded funds this year. Total annual flows are projected to reach approximately $2.1 trillion by year-end, driven by historically strong fourth-quarter performance. December typically accounts for the largest share of Q4 inflows, positioning the market to extend the current record pace through the final months of 2025.