The regulation of corporate behavior has persisted in spite of peaks of neo-liberalism in many developed jurisdictions of the world, including the U.K. This paradox is described as "regulatory capitalism" by a number of scholars. Of particular note is the proliferation of corporate regulation to govern "socially responsible" behavior in recent legislative reforms in the EU and U.K. In seeking to answer the broader question of whether corporate regulation indeed effectively governs and moderates corporate behavior, this paper focuses on the nature of corporate regulation. Although different pieces of corporate regulation purport to achieve different objectives and impose different types of obligations, this paper offers an institutional account of corporate regulation, specifically in relation to the U.K.'s regulatory capitalism, as the U.K. is typically held up as having a liberal market economy (which is broadly similar to the U.S.). In this article, I argue that the nature and effectiveness of corporate regulation crucially depends on the nature of regulatory capitalism in the type of economic order under discussion. Hence the study of the U.K.'s economic order and its efforts in introducing corporate regulation to change corporate behavior holds lessons more generally for corporate regulation in economies that share similar features. The examination in this article provides an overarching framework for distilling the achievements and limitations of corporate regulation in such economic contexts. First, the paper clarifies that regulatory capitalism in the U.K. is characterized by three key tenets that reflect the spirit of the liberal market economy embraced here. Over time, gaps have been revealed in the achievements of these tenets of regulatory capitalism, particularly in relation to social expectations of the regulation of corporate behavior. These gaps have become the subject of debates in the realm of "corporate social responsibility" (CSR), where business, civil society, and the state frame the expectations of corporate behavior in contested ways: in relation to the scope of responsibility, the motivations for corporate behavior, the theoretical premises, and business practices. In the aftermath of the global financial crisis in 2007-2009, we observe increasing legalization in the EU and U.K. of CSR issues, framed in * Professor of Corporate Law and Financial Regulation, University College London. This paper is based on my inaugural lecture at UCL, 16 January 2018. The author thanks Steven Vaughan and Marc Moore for comments on an earlier draft. All errors and omissions are mine.