In this paper, we develop a comprehensive model of M&A success. We integrate fundamental constructs of different schools and discuss their interdependencies with M&A success. Our theoretical framework was tested empirically across a sample of 106 SME transactions in the machinery, electronic, and logistic industries in the German‐speaking part of Central Europe. The results of our study support the demand for an integrative perspective and theory on M&A. M&A success is a function of strategic complementarity, cultural fit, and the degree of integration. Strategic complementarity also positively influences cultural fit and the degree of integration. Cultural fit positively influences M&A success, but surprisingly has a negative impact on the speed and degree of integration. The degree of integration is positively related to speed of integration. Copyright © 2013 John Wiley & Sons, Ltd.