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THE Singapore Exchange (SGX) has confirmed at 3.21pm that order and trade executions are accurate, and that the market will resume trading at 4pm.
It also said that the market will open as per normal on Friday.
Trading has been suspended for almost four hours since it first said in a media announcement before noon that its securities market was temporarily ceased as at 11.38am due to duplicate trade confirmation messages being generated.
"No duplicate trades were executed and the market remained orderly," it said at that time, adding that it expected trading to resume at 2pm.
In another update just before 2pm, it said that "member reconciliation files are being generated and that the securities market will not resume trading at 1400 hours". It added that it would advise the market of resumption time once member reconciliation is completed.
The bourse operator has apologised for inconveniences caused.
The last time that it suffered major trading disruptions was in 2014.
On Dec 3, 2014, market opening was delayed to 12.30pm because of a software glitch.
Before that, on Nov 5, 2014, multiple power supply issues resulted in a three-hour trading crash that affected the derivatives trading system as well.
Last year, the Monetary of Authority of Singapore reprimanded SGX for lapses related to those two outages.