Australian Securities Exchange (ASX)

The Australian Securities Exchange is Australia's primary securities exchange, sometimes referred to outside of Australia as the Sydney Stock Exchange. ASX is home to some of the world’s leading resource, finance, and technology companies.

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Currency: Australian Dollar (AUD)

Holiday Calendar
Trading Hours

For information about the ASX, see their official Corporate Overview page.

• Limit Day
• Fill or Kill (FOK)
• Immediate or Cancel (IOC)

• Lot Size: min. 1; max. 999,000,000
• Tick Size: varies by price, as follows:

• Short Sale Rules: short sales must be declared and are only permitted where a locate for the shares has been obtained. Naked short selling is prohibited.
• Circuit Breakers: although the ASX has not established fixed thresholds for circuit breakers or trading halts, trading in a company's shares may be halted from time to time for market-sensitive announcements or at the request of the company.

To enable the orderly consumption of the burst of messages during the single opening auction, effective June 23, 2025 the ASX introduced a new session state call 'Opening Single Price Auction' (OSPA). The OSPA will be rendomised, followed by the introduction of a levelling or buffering period before transitioning to continuous trading. A summary of OSPA features is listed below:

• The auction and transition to OSPA state occurs during a 15 second randomised window beginning at 09:59:00
• New orders and order amendments will be rejected during OSPA. Any attempts to enter new orders or amend existing orders will be rejected.
• Cancellation of orders during OSPA is permitted
• Report of Off Market Trades is permitted
• Transition from OSPA to Open (continuous matching) occurs during a 15 second randomised window
• Minimum duration of OSPA is 30 seconds with a maximum of 60 seconds (dependent on randomisation)

For more information please review ASX Trading Hours

The closing price is defined by the following closing auction mechanism.

Auction means an auction conducted in a Trading Platform in respect of Qualifying Bids or Offers pursuant to the following process:

• a) The Priority Bid is paired with the Priority Offer so that either the Bid or the Offer is fully satisfied;
• b) A new priority of Bids and Offers is established, deducting the quantity of Products paired under point a);
• c) The pairing and re-establishment of priority set out in point a) and b) are repeated until the Priority Bid is below the Priority Offer;
• d) All paired Bids and Offers are then matched at the Equilibrium Price;
• e) Any Bids or Offers which have not been matched at the completion of the process described in point b) will be carried through to the next Session State

Note: any order sent during the closing auction must be within 12% of the theoretical auction price. Otherwise, it will get cancelled automatically as a result of the exchange's fat finger check.

Note: to put orders into market directly, the order price should not be away from the Match Price by more than 5%. Else, they breach price limit and orders will be rejected.

Auction Periods

1. Pre-CSPA (16:00 - 16:10): During this period:

• Bids and Offers may be entered, amended, or cancelled in the Trading Platform
• Bids and Offers remaining in the Trading Platform from the previous Session State may be amended or cancelled
• Bids and Offers remaining in the Trading Platform at the commencement of the Session State retain their ranking in Price/Time Priority
• No Bids or Offers will be matched
• Allowable trades may be reported

2. CSPA (Closing Single Price Auction) (16:10-16:12 - random time +/- 60 seconds): During this period:

• An Auction is conducted on commencement of the Session State
• Auction Imbalance Orders are matched with other Orders at the end of the Auction following the transition of the Pre-CSPA Session State to the CSPA Session State
• No Bids and Offers may be entered, amended, or cancelled in the Trading Platform
• Qualifying Bids and Offers that have not been matched in the Auction will be carried through to the next Session State in Price/Time Priority
• No trades may be reported

Order Types: traders can enter a Limit orders to participate in the auction.

ASX24 Futures are available for execution/send orders. Quotes are still available.

• The Australian: Business Section
• The Australian Financial Review: Business Section
• Sydney Morning Herald: Markets Section
• Yahoo!Finance Australia

• ASX Market Data

• Market Guides