I understand that ASX trading on the equities market was halted today at 10.05 AM after five minutes' trading, and that trading restarted at 2.15 PM.
The derivatives market ASX 24 continues normal operation and has been open throughout today.
The ASX worked with its technology provider and in constant liaison with the market regulator ASIC to resolve their technical issues.
I've been advised the issues are not related to the introduction of competition, and will not affect the launch of Chi-X on 31 October.
The last time ASX experienced such an outage was 28 February 2011.
On 1 August 2010 ASIC took over responsibility for supervision of real-time trading on Australia's domestic licensed markets. This supplements its existing responsibility for enforcement of the laws against misconduct on Australia's financial markets and its supervision of Australian financial services licence holders.