An innovative approach to mitigating climate change beyond the international negotiations and hardlaw approaches is governing by disclosure - the acquisition and dissemination of information to influence the behavior of particular actors. This paper analyzes the institutionalization of carbon disclosure as an organizational field, focusing in particular on the role of governance entrepreneurs in this process. The emergence of carbon disclosure is scrutinized along four distinct stages of transnational institutionalization: start-up; competition and growth; convergence and consolidation; integration into international public policy. For each phase, the role and relevance of governance entrepreneurs is analyzed. The article finds that during the first stage, entrepreneurs mainly acts as innovators and ‘‘out-of-the-box’’ thinkers; in stage 2, entrepreneurs can be characterized as flexible adaptors and opportunity seekers, while in stage 3, the role of meta-governors in dominant. Finally, the last stage, entrepreneurs acts as connectors and bridge-builder between the transnational sphere of carbon disclosure and the wider international governance arena.