Stop-Loss
A predetermined price level at which a trade is automatically closed to limit losses.
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Explained Simply
A stop-loss order tells your broker to sell a stock when it reaches a certain price. For example, if you buy a stock at $100 and set a stop-loss at $90, the stock will be automatically sold if the price drops to $90 — limiting your loss to 10%. Stop-losses are the single most important risk management tool for active traders. Without them, a small loss can turn into a catastrophic one.
Types of Stop-Loss Orders
There are several ways to implement stop-losses, each with different trade-offs:
Fixed dollar/percentage stop: Set at a specific price or percentage below entry. Simple but ignores market volatility. A 5% stop on a low-volatility utility stock is very different from a 5% stop on a high-volatility biotech.
ATR-based stop: Placed 1.5-2x the Average True Range below entry. This adapts to each stock's natural volatility — wider stops for volatile stocks, tighter for calm ones. ATR-based stops are the professional standard because they account for how much a stock "normally" moves.
Support-level stop: Placed just below a key support level (prior swing low, moving average, VWAP). The logic: if price breaks support, the trade thesis is invalid. This method ties the stop to actual market structure rather than an arbitrary number.
Trailing stop: Moves up as the stock rises but never moves down. Locks in profits while still giving the trade room to run. Can be set as a fixed distance or a percentage from the highest price since entry.
Time-based stop: Exits the trade after a set period (e.g., 90 minutes for day trades) if the position hasn't reached its target. Prevents capital from being tied up in stagnant trades.
Common Stop-Loss Mistakes
Placing stops too tight: Setting a stop $0.10 below entry on a stock that regularly swings $0.50 guarantees you get stopped out by normal noise. Use ATR to set stops outside the stock's typical range.
Moving stops further away: The cardinal sin of risk management. If a trade is going against you, moving the stop down "just a little" turns a controlled loss into a catastrophic one. Only ever move stops in the direction of your trade.
Not using stops at all: Holding and hoping is not a strategy. Every professional trader uses stops. The difference between a small loss and a blown account is a stop-loss order.
Placing stops at obvious round numbers: Everyone puts stops at $50.00, $100.00, or $25.00. Market makers and algorithms hunt these clusters. Place your stop slightly below the round number (e.g., $49.85 instead of $50.00) to avoid being swept.
Using the same stop distance for every stock: A $2 stop on a $200 stock (1%) is very different from a $2 stop on a $20 stock (10%). Always think in percentages or ATR multiples, not absolute dollar amounts.
How to Use Stop-Loss
- 1
Determine Your Risk Per Trade
Decide the maximum percentage of your account you are willing to lose on a single trade — most professionals use 1-2%. For a $10,000 account at 1% risk, your maximum loss per trade is $100.
- 2
Calculate the Stop Distance
Measure the stock's ATR (14-period Average True Range) on your chart. Multiply the ATR by 1.5-2x to get the stop distance. For a stock with a $2 ATR, your stop would be $3-4 below your entry price.
- 3
Place the Stop-Loss Order
In your broker platform, enter a stop-loss order at your calculated price. For a long position entered at $50 with a $3 stop distance, set the stop at $47. Use a stop-market order (not stop-limit) for guaranteed execution.
- 4
Adjust Position Size to Match Risk
Divide your maximum dollar risk by the stop distance to get your share count. If you risk $100 and your stop distance is $3, buy 33 shares ($100 ÷ $3). This ensures the stop-loss limits your loss to exactly $100.
- 5
Monitor and Trail the Stop
As the trade moves in your favor, trail the stop up — never move it further away. After a $2 gain, consider moving the stop to breakeven. Use ATR-based trailing to automatically lock in profits while giving the trade room to run.
Frequently Asked Questions
What is a stop-loss order and how does it work?
A stop-loss order instructs your broker to automatically sell a security when it reaches a specified price. For example, if you buy shares at $50 and set a stop-loss at $47, the position is automatically closed if the price drops to $47, limiting your loss to $3 per share (6%). The order sits dormant until the trigger price is hit, then executes as a market order at the best available price.
Where should I set my stop-loss?
The best practice is to set your stop-loss based on the stock's volatility using ATR (Average True Range). A common formula is 1.5-2x the 14-period ATR below your entry price. This ensures the stop is outside normal price noise while still limiting risk. Alternatively, place it just below a key support level or the most recent swing low.
Can a stop-loss fail to protect me?
Yes. If a stock gaps down overnight (opens significantly lower than the previous close), your stop-loss will execute at the opening price, which may be far below your stop level. This is called gap risk. Stop-losses also convert to market orders when triggered, so in fast-moving markets, slippage can cause execution at a worse price than expected. Despite these limitations, stop-losses remain essential — they protect against most scenarios.
Should I use a stop-loss or a stop-limit order?
For most retail traders, a regular stop-loss (stop-market) order is safer because it guarantees execution. A stop-limit order guarantees your minimum selling price but risks not filling at all if the stock drops too fast. In volatile markets or during earnings, a stop-market order ensures you exit the position. Use stop-limit orders only on highly liquid stocks where gap risk is minimal.
How Tradewink Uses Stop-Loss
Every Tradewink signal includes a specific stop-loss level calculated using ATR (Average True Range) and historical support/resistance. Our AI also uses dynamic stop-losses that adjust based on volatility — tighter in low-vol environments, wider in high-vol to avoid getting stopped out by noise.
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See Stop-Loss in real trade signals
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