The expansion of VIX futures trading hours was delayed by CBOE Holdings Inc due to the government shutdown. It recently announced that the changes would be implemented on October 28 and November 4.

Once both the stages are complete, the futures of the Chicago Board Options Exchange Volatility Index or VIX would be available for trading between 3 am and 4:15 pm NY Standard time every weekday. An additional session every Monday would be done between 4:30 pm to 5:15 pm NY Standard time. 

The announcement was made by the biggest US options exchange owner on its Wednesday earlier today.

The two staged were planned for October 21 and October 28 before the partial shutdown of the US government. It had ended this week and was identified as the second cause of delay in expanded VIX trading hours. To undertake this, a software update to prepare for the changes brought about by a malfunction resulting in the shutdown of the CBOE's main market. The said shutdown was for nearly four hours, requiring the first announcement of the postponment.