Quote from nugundam:
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But I thought i read somewhere that MMs/ Specialists use L3 quotes that see ALL ORDERS, both visible and invisible (reserve in this case). Any point of clarification here? What are L3 quotes if they don't see the invisible orders?
NYSE specialists/floor brokers can see hidden NYSE liquidity, though I'm not sure if they can see hidden reserves or just the displayed size.
AFAIK, no one can see hidden ECN orders or ECN reserves.