Surely they can only do this type of trading with the help of a...

Surely they can only do this type of trading with the help of a broker otherwise the brkerage fees would be more than the cost of the parcel of shares. And if that is the case it would be a lot easier to prove. I remember a couple of moths age someone complained about price capping over at RSL and put in a complaint to either ASIC or the ASX. Maybe we should do that too.