Execution Version FIRST SUPPLEMENTAL INDENTURE This FIRST SUPPLEMENTAL INDENTURE (the "Supplemental Indenture") dated as of November 5, 2003 among OMNICOM GROUP INC., a New York corporation (the "Company"), OMNICOM CAPITAL INC., a Connecticut...Supplemental Indenture • November 5th, 2003 • Omnicom Group Inc • Services-advertising agencies • New York
