CommSec once did a fairly small buy of ssn for me on chi-x and that was at a higher price than the high of the day shown on CommSec.
If the volumes traded on chi-x where a lot higher than they currently are, I'd be concerned that people are not getting the full story when they look at just CommSec data. I'm not sure but maybe if the volume goes up on chi-x they have a way of making the data more comparable.
I think most days there are no SSN trades on chi-x.
SSN Price at posting:
2.6¢ Sentiment: LT Buy Disclosure: Held