The NZX said the fault that disrupted trading on the exchange today had been resolved, and that normal business would resume tomorrow.
"The NZX apologises to those impacted parties for the inconvenience caused," it said.
"A full investigation will take place in the following days and an incident report released to the market," it said in a statement.
Trading on the share market stopped at 11.15 am.
Earlier, the exchange confirmed that the fault was not due to a technical issue in the NASDAQ trading system.