Order Types

What are Order Types?

Order types are the basic execution instructions a venue accepts. A market order executes immediately at the best available price: the fill is all but certain, the price is not. A limit order rests at a chosen price and executes only there or better: the price is protected, the fill is not. A stop order becomes a market order once its trigger trades (or on some venues, once the bid or ask touches it), and a stop-limit becomes a limit order instead, adding price control at the risk of never filling on a gap. Time-in-force settings (day, good-till-canceled, immediate-or-cancel) govern how long each instruction lives.

Every type is a trade-off between fill certainty and price certainty, and setups map onto that trade-off naturally: breakout entries use stop orders to join only if price proves it, pullback entries use limits to be paid the spread rather than pay it, and exits that must happen use market or stop-market rather than anything that can miss. Combined with linkage logic, the basic types become order constructs such as brackets and OCO pairs.

How traders use it

• Matching entry style to type: stop orders above resistance for breakout entries, limit orders at support or a retracement level for pullback entries, market orders when immediacy matters more than the spread.
• Protecting positions: stop-market for the hard stop, since a fill with slippage beats no fill in a runaway move, with stop-limit reserved for thin instruments where a momentary wick would otherwise eject the position at a distorted price.
• Controlling costs in automation: alert-driven systems often choose limit entries to avoid paying the spread on every signal, accepting missed trades as the price of execution quality and tracking the miss rate as a statistic of its own.