Preliminary injunctions (PIs) are important in litigation in many settings, including antitrust, copyright, patent, trademark, employment and labor relations, and contracts. The filing of a PI and the court's ruling generate information that can impact settlement. We find that some plaintiffs request a PI to signal bounds on their damages in order to elicit better settlement offers. As a result, the parties are more likely to come to an out-of-court agreement permitting the disputed activity, compared to when a PI is motivated solely by defensive reasons to avert immediate damages during trial. Although the grant of a PI reduces ex post incentives for potential litigants to settle, this is more than offset by an increase in settlement upon a denial. Thus, ex ante, learning leads to more settlement. Nevertheless, the anticipation of learning and increased chances of settlement do not affect the initial filing decision. (JEL D
