The rise of the regulatory state (Levi-Faur 2005) led to the global diffusion of independent regulatory agencies – IRAs – (Jordana et al. 2018) which are expected to operate at arm's length from politicians and the regulated businesses (Majone 1997; Thatcher 2002). Diffused across different geographies, sectors, varieties of capitalism, and administrative and political traditions, IRAs became an institutional norm of regulation. However, several crises have questioned their performance and raised concerns over industry capture and politicization (Lodge and Mennicken 2014). This thesis tackles these issues through five questions: i) To what extent are IRAs shielded from capture at the de jure and de facto levels? ii) Have IRAs experienced an...