(2)The mandatory tick size was introduced to harmonise price increments on trading venues in the Union and to preserve market depth, liquidity and the orderly functioning of equity trading in the Union. To achieve those objectives, it is important that information on the adjusted average daily number of transactions used for determining tick sizes applicable to a share is available to all trading venues that offer trading in that share at the same time and that those trading venues start applying any adjusted average daily number of transactions on the same day. To that end, all competent authorities that supervise trading venues where the share concerned is traded should be informed about any adjustments to the average daily number of transactions for that share prior to the publication of those adjustments and trading venues should be given sufficient time to incorporate those adjustments in their systems.