This paper analyzes voluntary disclosure strategies of a privately informed firm when the information is relevant for the market price of the firm and also for an opponent. Favorable information increases the market price but might induce the opponent to take a discrete action that imposes proprietary costs on the firm. It is shown that there is always a full-disclosure equilibrium. There can exist partial-disclosure equilibria with two nondisclosure intervals. Comparative statics show some counter-intuitive results, e.g., higher proprietary costs or higher risk of an adverse action can make disclosure of favorable information more or less likely.