A lockup period for investment in a hedge fund is a time period after making the investment during which the investor cannot freely redeem his investment. It is routine to have a one-year lockup period, but recently the requested lockup periods have grown longer. We estimate the premium for such extended lockup, taking the point of view of a manager of a fund of funds, who has to choose between two investments in similar funds in the same strategy category, the first having a one-year lockup and the second having an n-year lockup. Assuming that the
manager will rebalance his portfolio of hedge funds on a yearly basis, if permitted, we define the annual lockup premium as the difference between the rates of return from these investments. We develop a Markov chain model to estimate this lockup premium. By solving systems of equations, we fit the Markov chain transition probabilities to three directly observable hedge fund performance measures: the persistence of return, the variance of return and the hedge-fund death rate. The model quantifies the way the lockup premium depends on these parameters. Data from the TASS database are used to estimate the persistence, which is found to be statistically significant.