| Good Till Cancel (GTC) | Default for all orders. Rests on the book until filled or canceled; expires at end of day. |
| Immediate or Cancel (IoC) | Fills as much as possible on arrival; any remainder is canceled immediately. Never rests on the book. Used for all Market Orders and IoC Limit Orders. |
| Fill or Kill (FoK) | Must fill completely on arrival (via one or more partial fills); any remaining balance cancels the entire order. Never rests on the book. |
| All or None (AoN) | Like FoK, but can rest on the book if no quantity fills on arrival. Cancels if it cannot fill in full when it eventually executes. |