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🛑 Risk Management · Stop-Loss

Setting Your Stop-Loss Rules
— a Guide to Loss Management That Protects Capital

The most important thing in investing isn't profit — it's capital preservation. We explain the differences between a fixed-percentage stop, an ATR-based stop, and a technical stop, and how to set a practical stop-loss using the risk/reward ratio (RR ratio).

Written by Dawn · IT Engineer · Published
💡 Key takeaway — A stop-loss isn't failure. It's capital insurance that trades a small loss to prevent a large one. No trader survives long term without one.

The Purpose of a Stop-Loss

A stop-loss has exactly one purpose: capital preservation. Recovering to break-even from a -50% loss takes +100%, but recovering from an -8% loss only takes +8.7%. Keeping your losses small lets you respond more flexibly to the next opportunity. Repeatedly averaging down without a stop-loss is the most common pattern that leads to an unrecoverable loss.

3 Ways to Set a Stop-Loss

① Fixed-Percentage Stop

The simplest method: stopping out -7 to 8% below your entry price. It's well known as the standard William O'Neil laid out in his CANSLIM strategy. Its strength is the simplicity of holding a fixed level regardless of volatility, but a high-volatility stock can get stopped out too quickly.

② ATR-Based Stop

ATR (Average True Range) is the average daily price range over a given period. It's set as stop-loss = entry price minus (1.5–2 × ATR). A high-volatility stock has a larger ATR, so the stop range automatically widens too. This has the advantage of reducing premature stop-outs from simple noise.

③ Technical Stop

This method stops out when a support level (a prior low, MA50, a structural horizontal line) breaks. Since it stops out when the technical structure behind your entry gets invalidated, it's the most logically clear-cut. That said, if the distance between the support level and your entry price is too wide, size your position down to manage risk.

Risk/Reward Ratio (RR Ratio)

RR ratio = target profit ÷ stop-loss distance. You need at least a 1:2 ratio (1 unit of risk for 2 units of target) or better. Even a 34% win rate is enough for long-term profitability at an RR of 1:2. Managing your RR ratio matters far more for long-term survival than a strategy that tries to win every single trade with no stop-loss.

The relationship between hit rate and stop-loss — checking results by signal on the DawnScan hit-rate page shows how your stop-loss criteria actually affect real-world performance.
Caution — All information here is for reference only, and the investment decision and its outcome are your own responsibility. Averaging down (the risk of lowering your average cost) is the opposite concept of a stop-loss and can lead to a large loss.
📮 Daily US Market Morning Brief — We send an analysis of the previous day's top 10 US gainers (TOP10) and what they had in common, every day at 8am (KST). Telegram @dawnbrief · Free · No ads · Not stock recommendations.

Frequently Asked Questions

What is a stop-loss?

A stop-loss is selling your shares to prevent further loss once your investment loss reaches a certain level. Its purpose is capital preservation, and "admitting you're wrong quickly and getting out" is the core principle of long-term survival.

At what % loss should I stop out?

For a fixed-percentage stop, -7 to 8% is the most commonly used benchmark. It's the figure William O'Neil laid out in his CANSLIM strategy. That said, it varies with a stock's volatility (ATR) and your entry rationale. An ATR-based stop (-1.5 to 2 ATR) fits better for a high-volatility stock.

What is an ATR-based stop?

ATR (Average True Range) is the average daily price range over a given period. An ATR-based stop sets the stop-loss 1.5 to 2 ATR away from your entry price. A high-volatility stock has a larger ATR, so the stop range automatically widens too, cutting down on stop-outs from simple noise.

It feels like the stock always bounces right after I stop out — what should I do?

A bounce right after you stop out is psychologically very painful, but that's confirmation bias. The cases where the stock kept falling after your stop fade from memory, and only the bounce cases stick with you. Long term, a trader who sticks to their stop-loss has a far higher survival rate. If your stop feels too tight too often, revisit your entry strategy instead.
📈
Hit Rate
The relationship between stop-loss criteria and real performance
📉
The Risk of Averaging Down
What happens when you average down instead of stopping out
📐
Pullback Trading
A strategy for entering with a tight stop-loss

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