This book provides the first comprehensive account of post-crisis international regulation of derivatives by bringing together the international relations literature on regime complexity and the international political economy literature on financial regulation. It addresses three questions: What factors drove international standard-setting on derivatives after 2008? Why did international regime complexity emerge? And how was it managed and with what outcomes? This research innovatively combines state-centric, transgovernmental, and business-led explanations. It examines all the main sets of standards (or elemental regimes) concerning various aspects of derivatives markets, namely: trading, clearing, and reporting of derivatives; resilience, recovery, and resolution of central counterparties; capital requirements for bank exposures to central counterparties and derivatives; margins for derivatives non-centrally cleared.