IB/TWS at minimum shows the spread book with the volume of combos traded during the day:
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Though now my question would be: how would someone hide those complex orders from others? Splitting leg orders to fill individually/separately?
How do I get that, please?
IBKR has it's own matching engine that I believe can withhold your order from the market (internalized order). Incidences when I've put on better bid/offers to add more size and they were not reflected in the bid/ask on my Portfolio screen. (Oops that didnt answer your question,...anyways...)