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AbstractWe examine a dynamic second-price auction with independent private values and sequential costly entry. We show that delayed revelation equilibria exist in which some buyers with sufficiently high valuations place coordinated low early bids, and bid their true valuations just prior to the end of the auction. Compared to the benchmark immediate revelation equilibrium, in which buyers bid their true values immediately after entry, fewer high-value bidders enter on expectation in some delayed revelation equilibria. We show that delayed revelation of buyer values decreases social welfare, but is necessary for bidders to have a strict participation incentive. Computations suggest that the welfare effect of delayed revelation consists primarily of transfer of surplus from the seller to bidders, while efficiency losses are relatively small.