On 23 June 2025, the Australian market will transition to a single open with all stocks opening at the same time.
Orders will start being accepted by the ASX market from 7am – with no orders matching or trading until 9.59am. During this three-hour window, brokers and their clients will be able to enter buy and sell orders into ASX in preparation for the market opening.
The transition to the opening single price auction, highlighted in the yellow stripes, will occur during a 15 second randomised window, between 9:59 and 9:59:15 (9:59 and 15 seconds).
All overlapping buy and sell orders will match and become trades. After this match, there will be a ‘levelling’ period of 15 to 30 seconds. The levelling period will enable the orderly consumption of the burst of auction trades to be processed by the brokers’ systems.
Between 9:59:45 (9:59 and 45 seconds) and 10:00am, the market will transition to the normal open market operating state.
