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Trading & Risk

Stop Losses

Pomegra Learn

Stop Losses

A stop loss is a predetermined exit rule: if the trade moves against you by a certain amount, you exit. The simplest version is a hard stop, placed directly with your broker: if the stock falls from $100 to $98, you are automatically sold. Yet in practice, stop losses are far more nuanced. A mental stop is one you follow only if you remember to look. A time-based stop exits if the trade sits flat for too long. An ATR stop adjusts for volatility: in choppy markets, you use a wider stop; in calm markets, a tighter one. Each type of stop solves a different problem, creates different risks, and requires different discipline.

This chapter is not about whether to use stops—that debate is settled. Markets gap against you, gaps will liquidate you. Professionals use stops. The chapter is about stop design: where to place them, which type is right for which situation, and how to avoid the common mistakes that turn stops into performance drains. Most traders place stops too tight, get whipsawed by minor volatility, and talk themselves into "the stop was just bad luck." Other traders place stops too wide, create such large losses on the rare occasions the stop triggers that they wipe out months of gains in a single trade. And worst: some traders have no stops at all, rationalizing that "management at market" will be better. That fantasy ends when a gap move arrives and the market opens 5% below their entry. By then, it is too late.

The mechanical reality of stops is this: they prevent catastrophic loss at the cost of a higher frequency of small losses. A trader without a stop might avoid hitting the stop 20 times, but on the 21st, a gap move wipes out the entire account. A trader with a stop gets stopped out 20 times, taking small losses, then avoids the catastrophic gap. The math favors the stop. This chapter teaches you the types, the math behind placement, and how to build stops into your position sizing from the beginning.

Why This Matters​

Stops are your account insurance policy. They are not optional; they are mandatory, or you will eventually blow up. Yet the way most traders implement stops is so poor that they might as well not have them. A trader might place a hard $500 stop on a position, thinking "I never lose more than $500 on any trade." But if the stock gaps 8% overnight and opens 5% below the stop, they exit at a loss > $1,000. The stop existed but did not execute at the expected price. This is slippage. It is inevitable, especially in illiquid assets or during volatility spikes. Ignoring slippage is a recipe for blown accounts.

Stop hunting is another hidden cost. In forex and crypto, market makers and sophisticated traders know where retail stop losses cluster—say, 2% below a recent high. They drive the price there, trigger the stops, then reverse hard. The retail trader has been mechanically exited at the worst price, usually by move of just 15 minutes of volatility. Placing stops at "obvious" levels makes you vulnerable to this predatory behavior. Time-based stops solve a different problem: if your thesis for a trade is "this will move in the next 3 days," and it has not after 3 days, your thesis is wrong. Exit regardless of price. This avoids the trap of slowly losing money in a position that "is about to work."

What You'll Learn​

This chapter teaches you the full taxonomy of stops: hard stops executed by your broker or in code, mental stops that require discipline, time-based stops triggered by calendar, volatility-adjusted stops using indicators like ATR (Average True Range), percentage stops (stop at 2% loss), support-based stops (stop just below a chart support level), and trailing stops (stop moves up with the price to lock in profit). You will learn the mathematics of slippage—how much worse than your intended stop price you can expect to execute, based on asset, timeframe, and market regime. You will discover why gap risk is the enemy of mechanical stops and how to size positions so that a gap does not wipe you out. And you will learn to integrate stops into position sizing: if you size assuming a stop at <5% loss, but the real slippage is <10%, you have sized incorrectly.

You will also learn the traps. Stops that are too tight create whipsaw losses and reduce overall profitability. Stops that are too wide defeat the purpose of risk management. Stops at obvious price levels invite stop hunting. No stop at all will eventually ruin you.

How to Read This Chapter​

Start by understanding your account size and your tolerance for a single loss. If you have a $10,000 account and cannot afford to lose $200 on a single trade, your stop loss cannot be 2% below your entry. It must be tighter, which means you must use a wider position size or you must wait for setups with better risk-reward. This chapter walks you through that logic. The articles that follow cover each stop type, the math of slippage, and how to combine stops with position sizing to create a coherent risk plan.

Chapter 4 builds on this chapter: once you have chosen your stop, you can calculate your risk per trade, and from that, your position size. These chapters work together.

Articles in this chapter​