Interestingly enough, almost 1$B in Euro puts for 1.1500 traded today. This kinda thing makes me wonder...
No, not a typo - 1.1500 puts. That's why I said, I wonder what the hell is going on... And I get this info from IFR - who I subscribe to and pay a nice monthly fee in order to get this data - which I've said on numerous posts before.
All exchanges provulgate volume and open interest daily without charge. Data vendors also send this information to subscribers. I subscribe to DJ, but anyone could get the data without charge at exchange sites.
No, not for OTC options, which is what those puts are. (No "exchanges" involved.) And certainly not on such a timely basis, free.
I assumed the puts in question were exchange-traded; since bank dealers who divulge clients' positions get fired. If a large client puts on a monster trade with a bank's dealer, bank management could easily find the dealer.
I think that's why information is passed on as a "whisper" among the community, without regards to who placed the order.
If a whale does an egregiously large trade with, say, Citibank; Citibank's risk managers will know it. The risk managers will also know the name of the dealer who did the trade; the managers will then fire the dealer for leaking highly sensitive proprietary information. If a whale, say, Citadel, finds out Citibank is leaking its trades to some pay-per-view forex rag; I'd guess Ken Griffin would personally rip off someone's head on Citi's trading floor.