On 9 April 2019, the European Securities and Markets Authority (ESMA) published an updated version of its Q&As on MiFIR data reporting. The updated Q&As insert a new question within section 19 – defined list of instruments. The new question asks: How should operators of trading venue(s) report instrument reference data in accordance with Article 2 of RTS 23 and related MAR RTS and ITS in cases where they operate on the basis of a defined list of instruments?