Organisational efforts to alter gender asymmetries are relatively rare, yet they are taking place in a number of universities. In the USA, sponsored by the National Science Foundation, ADVANCE programmes implement a number of interventions to improve the recruitment, retention, and advancement of women faculty. This study focused on one common intervention, faculty peer networks, and the role they play in gender equity reform. Longitudinal and cross-sectional qualitative data indicate that such peer networks function as catalysts for women's career agency, and challenge gendered organisational practices. Two key features of the peer networks, their structure and internal dynamics, facilitate these outcomes. At the same time, peer networks are limited by design in promoting structural change and must be implemented in concert with other forms of policy and structural change to be effective mechanisms for gender equity reform.