ASX generally pauses trading when a listed entity: tells ASX it...

ASX generally pauses trading when a listed entity:

tells ASX it is intending to lodge a market sensitive announcement and ASX is concerned the market does not trade on an uninformed basis ahead of that announcement; or
requests a trading halt and ASX agrees to the request, to prevent trading occurring on an uninformed basis while the trading halt is processed.

ASX itself may also initiate a pause in trading if it is unable to contact a listed entity to discuss a query about its disclosure obligations and has reason to be concerned that trading may be about to occur, or is already occurring, on an uninformed basis.

These processes have not changed as a result of the new functionality introduced to ASX Online. All that has changed is that ASX is now publishing a notice to the market when it imposes a pause in trading to notify the market of that fact and to expect a further announcement in due course explaining the reason for the pause.

As well as pauses in trading initiated by ASX as described above, there are also pauses in trading whenever ASX releases an announcement by a listed entity classified as �market sensitive�. The pause lasts for a period of approximately 10 minutes, unless the announcement relates to a takeover or scheme, in which case the pause lasts for approximately 60 minutes, after the release of the announcement. These types of pauses in trading are automatically applied to allow the market time to absorb the information in the announcement and do not result in an ASX �Pause in Trading� market release.

https://www.asx.com.au/resources/newsletters/listed_at_asx/listed-at-asx-20180919_0818.html