We investigate regulatory arbitrage during the G20's global derivatives market reform. Using hand-collected data on staggered reform progress, we find that banks shift their trading towards less regulated jurisdictions. The result is driven by agenda items – such as the promotion of central clearing – that are costly, but do not directly benefit banks. We further document that subsidiaries in jurisdictions with more reform progress are more profitable but riskier, and – alleviating endogeneity concerns – that reform progress primarily relies on structural factors.