hard · Order Flow Analysis market-mechanics-execution
A stock is quoted 100.00 bid / 100.02 offer (1-cent tick, so the spread is 2 ticks wide). A dark pool advertises midpoint-only execution. A buyer and a seller are both routed there and match for 5,000 shares at 100.01.
On the lit footprint/time-and-sales feed (which classifies trades by the lit quote using a tick/quote rule), how is this 5,000-share print most accurately characterized for delta purposes?
- Buyer-initiated, because the buyer's demand for immediacy is what consummated the cross and lifted the effective price toward the offer
- Seller-initiated, because the print at 100.01 is below the 100.02 offer, and the quote rule assigns sub-offer prints to the sell side
- Ambiguous/unclassifiable by the standard quote rule, printing exactly at the midpoint where neither bid nor offer test resolves the aggressor
- Delta-neutral by construction, because midpoint matches always pair one initiating buyer with one initiating seller of equal urgency
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