In this paper, the authors argue that the firm value implications of sport sponsorships for sponsors may depend on the competitive environment during the bidding process for different types of sponsorships. More specifically, the authors contend that the bidding environment for professional football (soccer) kit sponsorships represents a form of common value auction, while the bidding environment for corporate logo sponsorships on teams’ shirts does not. As common value auctions are prone to winner’s curse, the firm value implications should be different for kit sponsorship announcements than for shirt sponsorship announcements. Our results suggest that shareholders indeed perceive the value derived from kit and shirt sponsorships differently, resulting in the predicted distinction in their impact on sponsors’ firm value. This study sheds light on conflicting results on firm value implications of sport sponsorships in the prior literature and provides rich areas for future research.