Stop-Loss Strategies¶

Overview¶

Stop-loss orders are risk management tools that automatically exit a position when price reaches a predetermined level. Effective stop-loss placement balances protecting capital with avoiding premature exits from normal volatility.

Difficulty intermediate

Types of Stop-Loss¶

1. Fixed Stop-Loss¶

Stop Price = Entry Price × (1 - Fixed %)

Example:
Entry: $100
Stop: 5% below = $95
Risk: $5 per share

where: Entry Price initial fill · Fixed % predetermined risk tolerance per trade does: the simplest stop placement — used as a default when a trader has no volatility model handy; brittle because it ignores instrument volatility, so a 5% stop is hair-trigger for biotechs and trivial for utilities.

2. ATR-Based Stop-Loss¶

Stop Price = Entry Price - (ATR × Multiplier)

Common Multipliers:
- Tight: 1 × ATR (frequent stops, small losses)
- Standard: 2 × ATR (balanced)
- Wide: 3 × ATR (fewer stops, larger losses)

Example:
Entry: $100
ATR(14): $3
Stop: $100 - (2 × $3) = $94

where: Entry Price fill price · ATR average true range over a lookback (commonly 14 periods) · Multiplier stop distance in ATRs does: scales stop distance to recent realized range so each trade gets the same probability of being stopped by noise — used in trend-following and swing systems to avoid getting shaken out of high-volatility names and slow-bled in low-volatility names.

3. Volatility-Adjusted Stop¶

Stop Price = Entry Price - (Z × σ × √t)

Where:
Z = Confidence level (1.645 for 95%, 2.33 for 99%)
σ = Daily volatility
t = Holding period in days

where: Entry Price fill price · Z normal-distribution quantile for desired confidence · σ daily return standard deviation · t planned holding period in days does: sets the stop at the one-sided confidence band for a normal random walk over the holding period — used when sizing systematic positions to a target probability of being stopped out by noise alone; failing to widen Z for fat-tailed assets understates the true noise stop.

4. Trailing Stop-Loss¶

Stop follows price at a fixed distance:
- Fixed trailing: Stop = Highest Price - Fixed %
- ATR trailing: Stop = Highest Price - (ATR × Multiplier)
- Chandelier Exit: Stop = 22-day High - (3 × ATR)

5. Support/Resistance Stop¶

Stop placed below/ below key levels:
- Below recent swing low
- Below moving average
- Below trendline
- Below support zone

6. Time-Based Stop¶

Exit if position hasn't moved favorably within time window:
- Day traders: Exit by end of day
- Swing traders: Exit after 5-10 days if no progress
- Position traders: Exit after 1-3 months if thesis not playing out

Stop-Loss vs. No Stop-Loss¶

Simulation Results (Typical)¶

Strategy	Win Rate	Avg Win	Avg Loss	Max DD	Sharpe
No Stop	55%	3.2%	-4.1%	-25%	0.65
Fixed 5%	62%	2.8%	-5.0%	-15%	0.72
ATR 2x	58%	3.0%	-3.5%	-18%	0.78
ATR 3x	56%	3.1%	-4.8%	-20%	0.70
Trailing ATR 2x	54%	3.5%	-3.0%	-12%	0.85

Common Mistakes¶

Too Tight: Stops hit by normal noise, then price reverses
Too Wide: Risk-reward becomes unfavorable
Moving Stops: Only move in favorable direction, never widen
Round Numbers: Stops at round levels get hunted
Ignoring Gaps: Overnight gaps can blow through stops
No Stop: Hope is not a strategy

Checklist¶

[ ] Stop-loss defined before entering trade
[ ] Stop based on volatility, not arbitrary percentage
[ ] Risk-reward ratio favorable at stop level
[ ] Position size calculated from stop distance
[ ] Trailing stop considered for trending trades
[ ] Stop level not at obvious round number
[ ] Gap risk considered (overnight/weekend)
[ ] Stop order type selected (market vs. limit)
[ ] Stop reviewed and adjusted as thesis evolves
[ ] Maximum acceptable loss per trade defined

References¶

Van Tharp, E.K. (2007). Trade Your Way to Financial Freedom (2nd ed.). McGraw-Hill.
Minervini, M. (2013). Trade Like a Stock Market Wizard. McGraw-Hill.
Alexander, C. (2008). Market Risk Analysis, Volume IV: Value at Risk Models. Wiley.