Glossary/Risk Management & Trading Psychology/Stop-Loss
Risk Management & Trading Psychology
2 min readUpdated Apr 2, 2026

Stop-Loss

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A pre-determined price level at which a trader exits a position to cap losses. Stops are a core discipline of professional risk management.

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Analysis from Apr 2, 2026

What Is a Stop-Loss?

A stop-loss is an instruction — either as a standing order on an exchange or a personal rule — to exit a position when price reaches a defined level. Its sole purpose is to prevent a losing trade from becoming a catastrophic one.

For a long position bought at $100, a stop at $90 limits the loss to 10% regardless of how far the asset eventually falls. For a short position, the stop sits above the entry price.

Types of Stops

  • Hard stop: A fixed price level, never moved against the position
  • Trailing stop: Moves in the profitable direction as price improves, locking in gains while still capping downside
  • Mental stop: No live order — requires the discipline to exit manually when price is reached
  • Time stop: Exit if the trade hasn't worked within a defined timeframe

The Psychology Problem

The hardest part of stops is not placing them — it is not moving them. Traders routinely widen stops as price approaches, convincing themselves the move is temporary. This is how 10% losses become 50% losses. Professional traders treat the stop as a pre-committed contract with their future self.

Stop Placement

Poor stop placement is as damaging as having no stop. Stops set too tight get triggered by normal market noise ("stopped out and then the trade worked"). Stops based on market structure — below key support, above key resistance — perform better than arbitrary percentage levels.

Frequently Asked Questions

Where should I place my stop-loss?
Stop-losses should be placed at levels where your trade thesis is objectively invalidated — typically just below a key support level for longs or above key resistance for shorts, rather than at an arbitrary percentage from entry. A practical method is to use 1.5–2× the 14-day Average True Range (ATR) below your entry, which scales the stop to current market volatility. Once you know the stop distance, use it to determine your position size so that total risk per trade stays within your pre-defined limit.
What is the difference between a hard stop and a trailing stop?
A hard stop is a fixed price level that never changes once set, providing a defined maximum loss for the trade regardless of subsequent price action. A trailing stop moves upward (for long positions) as price rises, locking in a portion of gains while still capping downside if the market reverses — making it better suited for trend-following strategies where letting winners run is the primary objective. Most professionals use hard stops for managing downside on new positions and convert to trailing stops once a trade has moved significantly in their favor.
Can a stop-loss order fail to protect me?
Yes — the main failure mode is gap risk, where a market opens or moves so rapidly through your stop price that execution occurs significantly below your intended level, a phenomenon called slippage. This is most common around major news events, earnings releases, or during illiquid overnight sessions, and it means your actual loss can exceed your planned maximum. To mitigate this, some traders use stop-limit orders instead of stop-market orders, though these carry their own risk of not filling at all if the market gaps past the limit price.

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