We present a model of a discriminatory price auction in which a large bidder competes against many small bidders, followed by a post-auction resale stage in which the large bidder is endogenously determined to be a buyer or a seller. We extend results on first-price auctions with resale to this setting and use these results to give a tractable characterization of equilibrium behavior. We use this characterization to study the policy of capping the amount that may be won by large bidders in the auction, a policy that has received little attention in the auction literature. Our analysis shows that the trade-offs involved when adjusting these quantity caps can be understood in terms familiar to students of asymmetric first-price single-unit auctions. Furthermore, whether one seeks to maximize welfare or revenue can have contradictory implications for the choice of cap.We thank the anonymous referees for their helpful comments and suggestions.1 This policy currently restricts bidders to winning at most 35% of the market supply, but it has evolved over the course of the 20th century, with its size varying between 25% and 35% (Garbade and Ingber, 2005). Bartolini and Cottarelli (1997) find in their survey of "treasury" auctions around the world that 23% of the countries in their sample impose a ceiling on auction awards.