Hi Sunny,
Just got in.
To answer your question the ASX in all it's wisdom made a ruling back some time ago not to have "Broker Codes" visible as each trade was made on the day. Now we have to wait for a report that is available on a T+3 basis. So that means we have to wait until Tuesday to see which broker pushed the button at 3pm on last Thursday.
I hope this helps.
Cheers,
Brantley