Illiquidity discounts depend on the length of the trading restriction period. Existing theoretical restricted stock discount models are adapted to situations in which the trading restriction period has a well-defined fixed length. In many scenarios, the private equity investor faces a liquidity horizon that may be random or indefinite rather than of known fixed length. Stillian Ghaidarov will review a simple and robust methodology that allows us to extend the use of restricted stock discount models to scenarios in which the trading restriction period is random or indefinite.