Stop Loss

A pre-set order to automatically exit a position when the price reaches a defined level, limiting the maximum loss on a trade.

A stop-loss order instructs a broker to sell a security when it reaches a specified price, converting potential unlimited loss into a defined, capped loss. For example, buying a stock at $50 and placing a stop loss at $47 limits the loss to $3 per share (6%) regardless of how far the stock subsequently falls. Stop-losses are the primary mechanical tool traders use to enforce discipline and limit catastrophic losses.

Stop-loss orders come in several forms: a stop-market order becomes a market order when the trigger price is reached (guaranteeing execution but not price); a stop-limit order places a limit order at the trigger (guaranteeing price but risking non-execution if the stock gaps past the limit). In fast-moving markets or on large gap opens, stop-market orders may execute significantly below the trigger price — a phenomenon called slippage.

The placement of stop-losses is an art as much as science. Too tight and the position gets stopped out by normal volatility before the anticipated move occurs ("stopped out"). Too wide and the position sizing must be reduced proportionally to keep dollar risk constant, reducing the potential upside. Many traders place stops below technical levels like recent swing lows or moving averages, reasoning that a break of these levels invalidates the trade thesis.

This definition is for informational and educational purposes only. Nothing on Finance Compass constitutes financial, investment, or trading advice. Always conduct your own research and consult a qualified professional before making financial decisions.