medium · Market Microstructure lob

A trader places a Stop-Loss Sell order for 1,000 shares with a stop price of 70.00. Overnight, bad news causes the stock to gap down and open at 65.00.

What happens to the order at the open?

  1. The order triggers and becomes a market order, executing at the best available bid near 65.00.
  2. The order converts to a limit order pegged at 70.00 and sits unfilled awaiting a price recovery.
  3. The order executes exactly at 70.00, since that was the stop price the trader specified for the sale.
  4. The order is simply cancelled by the exchange because price gapped straight through the stop level.

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