The ASX trading platform is schedule for a comprehensive upgrade which is expected to go-live on Monday the 23rd of June. There are a number of key changes, particularly to the market open and close phases.

1. Opening Single Price Auction and Single Open: The existing five-group opening sequence will be replaced with an Opening Single Price Auction (OSPA) followed by a unified Open in a randomised auction time window. This will mean all equities and ETFs open at the same time, within a 30-second to 60-second range between 9:59:45am and 10:00:00am AET.
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3. Post Close Trading Session: Introduces a new lit-order trading period following the Closing Single Price Auction (CSPA), allowing execution at the established closing price. The Post Close trading session will commence at 4:11:00pm and end at 4:21:50pm AET.
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Closing Single Price Auction Enhancements: Enables securities with late-breaking announcements to participate in closing auctions while maintaining Post Close session eligibility.