
Article 1 
In Article 3 of Delegated Regulation (EU) 2017/588, the following paragraphs 8, 9 and 10 are added:
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8. The competent authority for a specific share may adjust the average daily number of transactions calculated or estimated by that competent authority for that share in accordance with the procedure set out in paragraphs 1 to 7 where all of the following conditions are met:
(a) the trading venue with the highest turnover for that share is located in a third country;
(b) where that average daily number of transactions has been calculated and published in accordance with the procedure set out in paragraphs 1 to 4, it is equal to or greater than one.When adjusting the average daily number of transactions for a share, the competent authority shall take into account the transactions executed on the third-country trading venue with the highest turnover for trading of that share.
9. The competent authority that adjusted the average daily number of transactions for a share in accordance with paragraph 8 shall ensure the publication of that adjusted average daily number of transactions. Prior to that publication, the competent authority shall communicate the adjusted average daily number of transactions for that share to the competent authorities of the other trading venues operating in the Union where that share is traded.
10. Trading venues shall apply the tick sizes of the liquidity band corresponding to the adjusted average daily number of transactions from the second calendar day after its publication.'.
Article 2 
This Regulation shall enter into force on the twentieth day following that of its publication in the Official Journal of the European Union.
This Regulation shall be binding in its entirety and directly applicable in all Member States.Done at Brussels, 13 February 2019.
For the Commission
The President
Jean-Claude JUNCKER