Days to Liquidate and Portfolio Liquidity
Days to liquidate estimates how long it would take to exit a position without dominating the market and moving the price against yourself, turning a raw position size into a practical measure of how "stuck" a fund actually is.
Prerequisites: Concentration Limits
A $500 million position in a stock that trades $50 million a day looks manageable next to a $500 million position in a stock that trades $2 million a day — even though both are the same dollar size, the second one is trapped. Days to liquidate turns raw position size into a practical liquidity number: how many trading days would it take to exit without becoming such a large share of daily volume that your own selling craters the price.
Days to liquidate estimates the time needed to unwind a position while capping participation at some fraction of average daily volume, so the exit itself doesn't become the thing that destroys the position's value.
The formula
In words: divide the position's size by the maximum amount you're willing to trade each day, which is itself some fraction (commonly 10-20%) of the stock's average daily volume — trading a bigger share than that each day tends to move the price noticeably against you.
Worked example
A fund holds a $40 million position in a small-cap stock with average daily volume of $8 million. Its policy caps participation at 15% of ADV per day.
(all figures in millions of dollars)
Thirty-three trading days — roughly a month and a half — to exit this single position without materially moving its price, even in ordinary market conditions. If the fund needed to raise cash for redemptions within a week, this position alone would force a choice between blowing through the participation limit (accepting a worse execution price) or missing the redemption deadline.
What this means in practice
Funds build days-to-liquidate limits directly into position sizing, often on a sliding scale — smaller maximum position sizes for names that would take longer than some threshold (say, 10 trading days) to exit. It becomes especially important during redemptions: a fund facing large investor withdrawals needs its most liquid assets to fund them quickly, and a portfolio skewed toward high days-to-liquidate names can be forced into a fire sale exactly when it can least afford one.
Average daily volume is measured in normal markets. In a stressed market — the exact scenario where a fund is most likely to need to sell — trading volume in a name can collapse well below its historical average at the same time everyone else is also trying to sell, making the real days-to-liquidate considerably longer than the textbook calculation suggests.
Practice in interviews
Further reading
- Grinold & Kahn, Active Portfolio Management (ch. on trading costs)