This paper explores the idea that the increasing concentration of institutional ownership in equity markets makes stock prices more "fragile," i.e., more exposed to liquidity shocks to institutional investors. I argue that institutional stockholders with stricter redemption policies, who are...

We find that Robinhood ownership changes are unrelated with future returns, suggesting that zero-commission investors behave as noise traders. We exploit Robinhood platform outages to identify the causal effects of commission-free traders on financial markets. Exogenous negative shocks to...

This study shows that firms regard stock price fragility - exposure to non-fundamental demand shocks stemming from the composition of equity ownership - as a salient corporate risk. We model ex-ante corporate responses to higher potential for future stock market misvaluation and then empirically...

According to conventional wisdom, annualized volatility of stock returns is lower when computed over long horizons than over short horizons, due to mean reversion induced by return predictability. In contrast, we find that stocks are substantially more volatile over long horizons from an...