The US regulator, the Commodities Futures Trading Commission (CFTC), has dropped Eurex's application to become a US exchange under its fast-track process, in order to allow more time for public scrutiny.

The CFTC's move follows the decision by the German-to-Swiss owned exchange to sue its Chicago rivals, the Chicago Board of Trade (CBOT) and Chicago Mercantile Exchange (CME), for illegally trying to stop its application to become a US exchange. Both exchanges have described Eurex's legal action as derisory and without merit.