We identify fixed-income mutual funds as an important contributor to the unusually high selling pressure in liquid asset markets during the Covid-19 crisis. We show that mutual fund liquidity transformation led to pronounced investor outflows. In meeting redemptions, funds followed a pecking...

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...