Q1 2010 Koppers Holdings Inc. Earnings Conference Call May 6, 2010 at 11:00 AM EDT Live Teleconference Information Primary # - 866-225-8754 Secondary # - 480-629-9692 Passcode - 4275134 Replay Teleconference Information Start Date - May 6, 2010 at 2:00 PM EDT Primary # - (800) 406 7325 Secondary # - +1 (303) 590 3030 Passcode - 4275134