Ask Mr Google or go to NSX site , your problem will not be finding a broker ,but finding a buyer on this highly illiqid exchange , some days not one share is traded on all companies listed
https://www.nsx.com.au/investing/broker-directory/
Today just two companies traded
https://www.nsx.com.au/marketdata/prices/
And for all the daily action read
https://www.nsx.com.au/ftp/diary/NSXDIARY26102017094229.pdf
And as Vonex is still in the “applying “ category and has not yet met the requirments the anticipated listing date is only a guide until they meet the requirements to list
https://www.nsx.com.au/investing/upcoming-listings/
And before you ask what are those requirements here is your answer
https://www.nsx.com.au/listing/how-to-list/
