We examine the relation between corporate governance and firms' information environments. We use the passage of state antitakeover laws in the U.S. as a source of exogenous variation in an important governance mechanism to identify changes in firms' information environments. We find that information asymmetry and private information gathering decreased and that financial statement informativeness increased following the passage of the antitakeover laws. Cross-sectional analyses indicate that the increased level of financial statement informativeness is attributable to firms that are most likely to access equity markets rather than managerial entrenchment, managerial career concerns, or managers' pursuit of the quiet life. Abstract: We examine the relation between corporate governance and firms' information environments. We use the passage of state antitakeover laws in the U.S. as a source of exogenous variation in an important governance mechanism to identify changes in firms' information environments. We find that information asymmetry and private information gathering decreased and that financial statement informativeness increased following the passage of the antitakeover laws. Cross-sectional analyses indicate that the increased level of financial statement informativeness is attributable to firms that are most likely to access equity markets rather than managerial entrenchment, managerial career concerns, or managers' pursuit of the quiet life.Keywords: antitakeover laws; corporate governance; financial reporting quality; information asymmetryWe are grateful to Soren Hvidkjaer for providing data on the Probability of Informed Trade. This paper has benefitted from feedback from Ashiq Ali, Anne Beatty, Donal Byard, John Core, Umit Gurun, Raffi Indjejikian, Ilan Kremer, Edward Li, Stan Markov, Ed Owens, Cathy Schrand, Nemit Shroff, Ross Watts (editor), Joanna Wu, Tzachi Zach, Helen Zhang, and an anonymous referee. We also thank seminar participants at