We examine whether firms' Corporate Social Responsibility (CSR) activity is due to managers acting at the expense of their owners or in-line with owner preferences. The former implies that CSR activity is more prevalent among firms with entrenched managers, whereas the latter suggests that CSR activity is higher in firms with more vigilant owners. Consistent with the shareholder-driven view, our empirical results show that CEO turnover-financial performance sensitivity increases in firm CSR scores, measured contemporaneously as well as prior to CEO appointment. Further, CSR ratings remain unchanged following CEO turnover and are associated with measures of superior owner oversight.