This study investigates the growing importance of sustainability in equity markets by estimating whether company commitment to sustainability matters in corporate valuation. The spreading concern for social and environmental issues, and especially for the material risks of climate change, induces policy to encourage companies to prioritise sustainability in their decision making. There is growing evidence that points to a rationale for a profit-driven response to social and environmental problems, uncovering the role of sustainability in investors’ decisions. Exploring a panel of 3,311 listed companies in 58 countries for the period 2010-2016, this study reveals that sustainability contributes to the creation of market value for listed companies, over the considered period. Furthermore, it investigates how this relationship changes according to environmental policy stringency and sector sensitivity to climate policies.