
Crowded trades and consequences
A crowded trade is a position with a high ratio of active institutional investor involvement relative to its liquidity. Crowding is a form of endogenous market risk as it arises not from contracts’ fundamentals but from the market itself. The risk of crowding has increased in past decades due to the growing share of institutional investors in the market, particularly the activity of hedge funds. Liquidations of crowded positions can trigger price distortions and, in cases of self-reinforcing deleveraging, even systemic pressure.
Crowdedness can be measured by the total value of active institutional positioning in an asset relative to its trading volume. It indicates how long it would take institutions to exit their trades under normal market conditions. For U.S. stocks, these ratios can be calculated based on reported data. Crowding typically skews risk to the downside. This point has been proven empirically for the U.S. equity market. However, crowdedness should also command excess premia. Historically, crowded stocks have outperformed non-crowded stocks materially and with high statistical significance.