Electronic copy available at: http://ssrn.com/abstract=2011889 Impression management and Non-GAAP reporting in earnings announcements Encarna Guillamon-Saorin Universidad Carlos III de Madrid Helena Isidro Instituto Universitário de Lisboa (ISCTE-IUL), BRU UNIDE, Lisboa, Portugal Ana Marques 1 NOVA School of Business and Economics – Universidade Nova de Lisboa January 2012 The authors appreciate the valuable comments received from the workshop participants at NOVA School of Business and Economics and at the Grenoble Ecole de Management. This study was supported by the Foundation for Science and Technology in Portugal (grant PTDC/EGE-GES/103770/2008). Encarna Guillamon-Saorin acknowledges financial contribution from the Spanish Ministry of Science and Innovation (SEJ2007-67582-C02-02/ECON, ECO2010-19314) and Comunidad Autonoma de Madrid (SEJ2008-00059-003). Ana Marques also acknowledges financial support received from Nova Forum. We are grateful for the excellent research assistance of Arash Aloosh and Luís Araújo. 1 Corresponding author: NOVA School of Business and Economics, Campus de Campolide 1099-032 Lisboa, Portugal. Tel: +351.918080250. Fax: +351.21387933. Email: ana_marques@novasbe.pt