This paper documents that firms face upward‐sloping supply curves when they repurchase shares in a Dutch auction, and it analyzes the market reaction to these offers. The announcement price increase is highly correlated with the ultimate repurchase premium. Prices decline at expiration only for pro‐rated offers. The cumulative return is positive and highly correlated with the repurchase premium, excepting pro‐rated offers. Much of this price increase is consistent with movement along an upward‐sloping supply curve. Trading volume around the Dutch auction parallels fixed‐price repurchases. Supply elasticity is larger for firms with large trading volume, firms included in the S&P 500 Index, and takeover targets.