• A Fill or Kill (FOK) order is an order that is intended to be filled immediately at the market price or specified price, or canceled if not filled.

  • A FOK order combines an all-or-nothing (AON) specification indicating that it must be fully executed with an immediate or cancel (IOC) time frame.
  • Typical FOK orders last a couple of seconds to minimize stock price disruption, and partial execution is not allowed.