We seek to contribute to understanding index fund stewardship by providing a comprehensive theoretical, empirical, and policy analysis of such stewardship. We put forward an agency-cost theory of the stewardship decisions that index fund managers make. Our agency-costs analysis shows that index...

Exchange-traded funds (ETFs) are typically viewed as passive index trackers. In contrast, we show that corporate bond ETFs actively manage their portfolios, trading off index tracking against liquidity transformation. In our model, ETFs optimally choose creation and redemption baskets that...