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australia_securities_exchange [2023/02/27 12:08] – hammedaustralia_securities_exchange [2025/06/23 14:00] (current) – [Auction Mechanisms] hugo
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 === Open === === Open ===
  
-The opening auction procedure begins at 10:00 AM and lasts for about 10 minutes. Opening prices are calculated during this phase. Securities open in five groups, according to the starting letter of their ASX code:+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 [[https://www.asx.com.au/markets/market-resources/trading-hours-calendar/cash-market-trading-hours | ASX Trading Hours]]
  
-  * Group 1  10:00:00 am +/- 15 secs 0-9 and A-B, e.g. ANZ, BHP 
-  * Group 2  10:02:15 am +/- 15 secs C-F, e.g. CPU, FXJ 
-  * Group 3  10:04:30 am +/- 15 secs G-M, e.g. GPT 
-  * Group 4  10:06:45 am +/- 15 secs N-R, e.g. QAN 
-  * Group 5  10:09:00 am +/- 15 secs S-Z, e.g. TLS 
  
 === Close === === Close ===
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   * No trades may be reported   * No trades may be reported
  
-**Order Types:** traders can enter Limit orders to participate in the auction. +**Order Types:** traders can enter a Limit orders to participate in the auction.
  
 +===== ASX24 Futures =====
  
 +ASX24 Futures are available for execution/send orders. Quotes are still available.
  
 ===== Additional Info ===== ===== Additional Info =====
australia_securities_exchange.1677517693.txt.gz · Last modified: 2023/02/27 12:08 by hammed