By using five measures of corporate governance, this paper sheds light on the relationship between corporate governance, firm performance and firm valuation in a sample of large Swedish firms between 2013-2016. The study is conducted on the grounds of the Agency Theory as proposed by Jensen and Meckling (1976) and influenced by corporate governance research by Bhagat and Bolton (2008). Using Tobin’s Q and return on assets (ROA) as estimates of firm valuation and firm performance respectively, we find mixed results compared to prior research concerning the effects of good corporate governance. Our study shows that greater equity holdings of board members are significantly and positively impactful on Tobin’s Q as well as ROA. Furthermore, we find that a larger board size has a significant inverse relationship with both Tobin’s Q and ROA, which is consistent with prior research suggesting that smaller boards are more effective. Interestingly and partly inconclusive with prior research however, we find that greater equity holdings of the CEO is significantly and negatively impactful on Tobin’s Q as well as ROA. These results are robust for multiple controls and various models.