Being part of a portfolio management team puts you in a position to influence how client money is managed. Depending on the firm, clients may be insurance companies and pension funds or retail investors. In all cases, you will use quantitative models to analyze vast data sets to identify opportunities that can be applied to large groups of securities to improve performance.
Quants working in portfolio management also may be responsible for creating optimal execution models that predict the best ways to trade blocks of securities without creating major price movements. They may use mathematical models to locate and leverage price misalignments, or create algorithms that allow traders to exploit market news quickly and efficiently.