ABSTRACTA standard result in the voluntary disclosure literature is that when the manager's private information is a signal correlated with the firm's liquidation value, mandatory disclosures substitute for voluntary disclosures. In this paper, we assume that the manager's private information complements the mandatory disclosure and show that the content and likelihood of a voluntary disclosure depend on whether the mandatory reports contain good or bad news. This different information asymmetry produces new, testable implications regarding the probability of and market reaction to voluntary disclosures. We also show that changes in mandatory disclosure regulations can have unintended consequences due to their effects on the manager's willingness to voluntarily provide supplemental disclosures.