Market Order

What Market Order means

A market order carries a quantity but no price condition, so it is the fastest and most certain way into or out of a position. A buy market order transacts at the prevailing ask, a sell market order at the prevailing bid, which means the trader immediately crosses the spread. Because the only instruction is to transact now, execution is close to certain in normal conditions, but the price is not. Between the click and the moment the order reaches the liquidity pool the quote can move, and the fill reflects whatever is available at that instant.

How the platform behaves depends on the broker's execution model. Under market execution the order is accepted and the achieved price is reported afterwards, with any difference recorded as slippage, positive or negative. Under instant execution the broker may reject the request and offer a requote if the displayed price has gone stale. Most retail platforms let the trader set a maximum deviation or slippage tolerance in points, which cancels the order rather than filling it if price has moved further than the tolerance allows.

Market orders are the sensible default when getting filled matters more than getting a specific price, such as exiting a losing position or reacting to a confirmed breakout. They are the worst choice in thin conditions, around scheduled data releases, or at the weekly open, where the spread can be several times its normal size and the fill can land far from the last quoted price. Traders who need price certainty more than speed use limit orders instead, accepting the risk that the order may never be filled.