ABSTRACT The politics of climate change in Australia remains highly fraught, this is despite the country experiencing acute impacts of a changing climate including mega-fires, floods, and severe and prolonged drought. Government inaction has led to limited market signals encouraging producers or consumers to move away from carbon intensive energy production to clean energy. In the absence of regulation, Australian shareholder activists are engaging directly with company boards and executives to reform corporate behaviour. This engagement, environmental, social, and governance (ESG) shareholder activism, has proliferated since 2017, much later than in comparable jurisdictions. Activists have targeted the mining, oil and gas, and finance sectors, due to their contribution to the Australian economy and their direct impact on global emissions. This paper explores the reasons for, and the implications of, the growth in ESG shareholder activism in Australia. It argues that the emergence of this activism in Australia was delayed due to complexities in the country's corporations' law. Regulatory attempts at stymying ESG shareholder activism resulted in the emergence of a duopoly of actors, at the cost of broader investor and civil society engagement. It is concluded that the rise of ESG shareholder activism in Australia is linked to growing tension between societal expectations, regulation, and the behaviour of firms. And, that ESG activists have been successful in leveraging this tension. There is evidence that large corporates have responded to activist claims, rendering this form of activism a potentially effective method for addressing some of the most pressing issues facing society.