The chief executive of Ireland's national stock exchange has quit her post only three months after successfully steering the group through its €137m takeover by Euronext.

Euronext Dublin, as the exchange is now known, announced Deirdre Somers' decision to resign as CEO in a statement on Thursday. She will be replaced by Daryl Byrne, who will also serve as the exchange's head of debt and fund listings and exchange traded funds and is a member of its managing board.