Online brokerages provide many types of orders to cater to the various needs of the investors. The common types of orders available are market orders, limit orders and stop orders.
Market Order
A market order asks the broker to execute at available market prices. It prioritizes execution rather than a specific price. Quotes can change and an order can fill across several price levels; neither a displayed bid/ask nor immediate execution is guaranteed, particularly in a fast or thin market.
Limit Order
A limit order sets the highest acceptable buying price or lowest acceptable selling price. It may fill partly or not at all. A quote touching the limit does not guarantee a fill because available size and order priority matter.
Stop Loss Order
A stop instruction activates another order when its trigger condition occurs. For options, availability and whether the trigger uses the option price, underlying price or another condition depend on the broker. A stop is not guaranteed protection against loss.
Stop Market Order
When its trigger condition is satisfied, a stop-market instruction becomes a market order. A buy stop is commonly placed above the relevant current price and a sell stop below it. Confirm the trigger source and how gaps or unavailable quotes are handled.
A triggered market order can execute far from the stop price, especially during a gap or volatile market. Trading halts or unavailable liquidity can also prevent immediate execution.
Stop Limit Order
A stop-limit instruction becomes a limit order after its trigger condition is satisfied. It controls the acceptable execution price but can remain unfilled while losses grow. The trigger and limit are separate settings; confirm the broker’s supported option-order types.
Worked fills and unfilled quantities
A buy limit for four contracts at $1.50 can fill two at $1.45 and leave two open. The filled portion costs $290 with a 100 multiplier, before fees. The remaining limit is still $1.50 unless changed or canceled. A cancellation request does not reverse earlier fills and may arrive too late to prevent another execution.
A market order prioritizes execution when a market is available but does not cap price. A stop-market order becomes a market order once its triggering condition is met. A stop-limit order instead becomes a limit order and can remain unfilled after a gap. Broker definitions of eligible triggers and supported option order types vary.
For example, an option bought for $3 has a sell stop at $2. If the next tradable bid is $1.20, a stop-market execution could occur near that price rather than $2. A stop-limit with a $1.90 minimum might not execute at all. Neither mechanism makes the planned $100 loss per contract certain.
For combinations, work in a net package price and confirm how the broker handles complex-order partial fills. Compare the cost of crossing every leg separately with a package limit; do not assume that each displayed midpoint can be traded simultaneously.
