What Is a Stop-Loss? How to Protect Your Trades

Intermediate Updated June 2026

You buy 100 shares of OGDC at Rs 150 because you expect the price to rise. It does the opposite and starts sliding. Do you sell now and accept a small loss, or hold and hope it bounces back? A stop-loss answers that question in advance, so you do not have to decide in a panic while the screen is red.

So what is a stop loss, in plain terms? It is a rule you set ahead of time for getting out of a trade that goes against you. Let us walk through exactly what it does and how to use one.

What a stop-loss actually does

A stop-loss is a standing order with your broker. You name a price below your purchase price, and if the share trades down to that level, your shares are sold automatically. The price you set is the stop price or trigger. Until the share touches that level, nothing happens and you stay invested.

The point is simple: cap the damage on any single trade. If you decide before you buy that you are willing to risk Rs 1,000 on a position, a stop-loss enforces that limit even when you are asleep, at work, or away from your phone. It takes the emotion out of the exit.

How to place a stop-loss

In most broker apps the steps look like this:

• Open the order screen for the share you own (or are buying).
• Choose stop-loss or stop order as the order type instead of a plain sell.
• Enter the trigger price, the level at which you want to be sold out.
• Set the quantity, usually all the shares in that position.
• Confirm. The order sits in the background until the price is hit.

A plain stop-loss becomes a market order once it triggers, meaning it sells at whatever price is available at that moment. That is worth understanding before you rely on it, which brings us to the next point.

Choosing the level: percentage, support, or volatility

Setting the trigger too close to the current price gets you sold out on normal wiggles. Setting it too far defeats the purpose. Three common methods help you find a sensible spot.

Percentage method. Decide how much you are willing to lose, say 8 to 10 percent, and place the stop there. Buy at Rs 150, set the stop near Rs 135. It is the easiest method and a fine starting point for beginners.

Support level method. Many traders place the stop just below a recent support level, a price the share has bounced off before. If LUCK keeps holding Rs 700 and bouncing, a stop a little under Rs 700 makes sense: if it breaks that floor, your original reason for buying is probably wrong.

Volatility method. A share that swings 5 percent a day needs more room than a calm one, or you will be stopped out constantly. Give jumpy shares a wider stop and steady ones a tighter one. Generally, the more a share moves day to day, the more breathing room your stop needs.

Stop-loss versus stop-limit

These two sound alike and trip up many beginners.

• A stop-loss (stop-market) turns into a market order when triggered. It almost always executes, but the exact price is not guaranteed, especially in a fast drop.
• A stop-limit turns into a limit order when triggered. You set a floor price below which you refuse to sell. It protects you from selling far too cheap, but if the price blows straight through your limit, the order may not fill at all and you keep falling.

Plainly: a stop-loss prioritises getting out; a stop-limit prioritises the price you get. Beginners protecting against a real loss usually want the certainty of getting out, so a plain stop-loss is the common choice. If price control matters more to you, read up on the difference between market and limit orders first.

Common mistakes to avoid

• Setting it too tight. A 2 percent stop on a normal PSX share will fire on routine noise and lock in tiny losses again and again.
• Moving the stop down. The price falls toward your trigger, you lose nerve and lower the stop to give it room. This is the single most expensive habit in trading. Lowering a stop on a losing trade defeats the entire purpose. You can raise a stop to lock in gains; never drop it on a loser.
• Forgetting about gaps. If bad news hits overnight and the share opens far below your trigger, a plain stop-loss sells at the open, which can be well under your stop price. The tool limits risk; it does not erase it.
• Treating it as a strategy. A stop-loss controls downside on a trade. It does not tell you what to buy. It works alongside research, not instead of it.

A tool, not a guarantee

A stop-loss is one of the most useful habits a new investor can build. It forces you to decide your risk before money is on the line, and it removes the temptation to hold a sinking position out of hope. But it cannot defy gravity. In a sharp gap down, a fast-moving panic, or a halted share, you may be filled worse than your trigger. Treat it as a seatbelt: it sharply reduces harm without promising you will never get hurt. Position size matters too. If you ever trade with borrowed money, understand how leverage works before relying on a stop, because losses move faster there. The same discipline applies whether you are buying in a bull or bear market, or even short selling where a stop sits above your entry instead of below it.

Key takeaways

• A stop-loss automatically sells your shares if the price falls to a level you set, capping the loss on a single trade.
• Pick the level with a percentage rule, a support level, or the share's volatility, not by guessing.
• A plain stop-loss sells at market when triggered; a stop-limit sets a price floor but may not fill in a fast drop.
• Never move a stop-loss down on a losing trade, and avoid setting it so tight that normal noise triggers it.
• It is a risk-management tool, not a guarantee: an overnight price gap can sell you out below your trigger.

Frequently asked questions

Where should I set my first stop-loss?

If you are just starting, a percentage stop is the simplest. Decide how much you are comfortable losing on the trade, often 8 to 10 percent, and place the trigger there. As you get more experienced you can switch to placing it just below a support level instead.

Will a stop-loss always sell at the exact price I set?

No. A plain stop-loss becomes a market order when triggered, so it sells at the next available price. In a fast fall or after bad overnight news, that price can be lower than your trigger. The stop limits your loss but does not lock in an exact exit price.

What is the difference between a stop-loss and a stop-limit?

A stop-loss almost always executes but does not guarantee the price you get. A stop-limit lets you set a price floor you will not sell below, protecting the price but risking that the order never fills if the share drops straight through your limit. Choose based on whether getting out or getting a price matters more to you.

Can I use a stop-loss on PSX shares?

Often, yes, but it depends on your broker. Stop or stop-loss order types are not offered on every PSX trading platform, so check your own broker's order screen, or ask their support desk, to confirm it is available. Even where it is, your fill can differ from your trigger price: thinly traded shares can gap, and the exchange's daily price limits and trading halts can affect when and how an order executes. For the official rules on price limits and halts, the Pakistan Stock Exchange (PSX) and the Securities and Exchange Commission of Pakistan (SECP) are the authoritative sources.

Should I move my stop-loss if the price is falling toward it?

No. Lowering a stop on a losing position to avoid being sold out is one of the most costly habits in trading, because it removes the protection you set up. You can raise a stop to protect a profit, but you should never drop it on a loser.

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Educational only, not financial advice.