IRENE KRISTAL, I, Plaintiff, v. MESOBLAST LIMITED, SILVIU ITESCU, and JOSH MUNTNER, Defendants., page-119

I am not speculating but I am not an expert in the US system. But it’s structurally the same process. In order to make out you case the plaintiff would almost always have to give evidence. You need to lead evidence and you might then be cross examined by the defence. You cant get someone else to do it. You can’t just get Lawers to do it. You can’t just produce documents into court without someone tabling them. You need the actual person to do all that. She would need to give all the evidence.

there might be other witnesses for the plaintiff side as well. Like expert witnesses you might provide evidence on loss or evidence on how the market would have behaved if the proper disclosure had been made etc.

In some ways picking a good lead plaintiff is key. As it is the lead plaintiff that determines the outcome for all.

You should Google shareholder class action in Australia and there is loads of good info. I found the following as a basic introduction:

https://www.findlaw.com.au/articles/1123/the-rise-of-shareholder-class-actions-in-australia.aspx