Euronext and the New York Stock Exchange will set up separate supervisory trusts should the two groups merge, according to a filing placed on the SEC website. Shareholders have been concerned that tougher US financial regulations would apply to Euronext-listed firms if the merger goes ahead.

Euronext shareholders are due to vote on the merger at a EGM in December. The German stock exchange Deutsche Börse also wants to merge with Euronext.