Thanks for the clarification. If that’s how it was done, I wonder how they would have known all those different contracts were from one person, especially if he placed them with different brokers.
Doesn’t matter which broker you use. They can see the number of contracts bids/sells that come into the market. I trade emini russell futures and can see the volume. I can see when a big buyer/seller comes in.
Sorry, guess I should’ve explained that regardless of which broker you use the contracts all go through the same exchange.