This thesis investigates the performance of Swedish listed family-controlled firms using re-turn on assets (ROA) and Tobin’s Q as performance measures. Results show that found-ing-family firms perform 6.1 % better than other firms for ROA. Firm-specific knowledge of the founder-CEO is the main cause of the enhanced performance. The results are not robust to residual testing which suggests caution when drawing conclusions from these re-sults. The main contribution of this thesis is an empirical analysis of family insider repre-sentation and the relation to ROA and Tobin’s Q in a sample consisting entirely of Swedish firms.