An empirical analysis of NYSE specialist trading1We thank Jim Cochrane, Joel Hasbrouck, Don Keim, Kim Shapiro, Jerry Warner, and an anonymous referee for their helpful comments. Seminar participants at the Ohio State Conference on `Dealer Markets', London School of Economics, University of Pennsylvania, and University of Wisconsion provided many helpful suggestions. Minder Cheng, Nicole Parent, and Ed Steffelin provided excellent research support. This research was completed while Madhavan was visiting the New York Stock Exchange. The comments and opinions contained in this paper are those of the authors and do not necessarily reflect those of the directors, members or officers of the New York Stock Exchange, Inc.1