Ann: $264m Damages claim against ASX for misleading conduct, page-158

Even if it was the full amount, that is still a hugely significant discount to what they were paying unless ISX was taking only a portion of the transactions. Maybe ISX were low-balling in the damages claim.

Absolutely, could have been massive with potentials and projections for them, but ISX have to substantiate their claims and not sure they could argue a potential (getting the contract) and then multiply it against the potential customer's potential (VGW's growth).
It's a shame overall for ISX, I do hope they have the details to substantiate it all.