Stop-Loss Order Explained: SL vs SL-M, GTT and Trailing Stop-Loss With Simple Examples
- November 12, 2026
- Posted by: Kunal Singla
- Category: Market
A stop sells automatically once the trigger price is hit. SL turns into a limit order, SL-M into a market order. A GTT order can stay active for up to one year.
Quick Answer
A stop order is an instruction to exit a trade automatically when the price moves against you to a level you have chosen. When the price touches your trigger price, the order becomes live and sells the shares, either at your limit price or at the best available price. It caps the damage from a bad trade, but it cannot protect you from a sharp gap down overnight.
A stop-loss order is the simplest tool for protecting capital, yet many beginners place trades with no exit plan at all. Then a sudden fall turns a small, planned loss into a large, unplanned one.
This guide explains how a protective stop works, the difference between SL and SL-M orders, how a GTT order keeps your stop alive for weeks, and how to set a trailing stop-loss. Each section uses a simple example so the mechanics are clear before you risk real money.
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What Is a Stop-Loss Order and How Does It Work?
A stop-loss has two parts. The trigger price is the level that activates the order. The order that follows, a limit order or a market order, is what actually sells your shares once the trigger is hit.
Suppose you buy a share at Rs 100 and decide you will not accept more than a Rs 5 loss. You place a sell order with a trigger price of Rs 95. If the price falls to Rs 95, your order wakes up and exits the trade. If the price rises instead, nothing happens and your stop stays in the background.
SL vs SL-M: Which Stop Type Should You Use?
An SL order is a protective stop limit order. When the trigger price is hit it becomes a limit order at the price you specified. If the price falls through your limit very quickly, the order may not fill at all, and you stay in the trade while the price keeps dropping.
An SL-M order is a stop-loss market order. When the trigger price is hit it becomes a market order and fills at the best available price. You get the exit, but the price may be slightly worse than your trigger. Some brokers restrict the SL-M order in certain segments, so check what your platform allows.
| Order type | What happens at the trigger | Main risk |
|---|---|---|
| SL (stop limit) | A limit order is placed at your price | May not fill if the price gaps through it |
| SL-M (stop-loss market) | A market order is placed | Fill price can be worse than the trigger |
| GTT order | Stays active until triggered, up to one year | Trigger may not fill if liquidity is thin |
Because an SL-M order fills at the next available price, slippage can be larger when the stock gaps through the trigger.
How a GTT Order Keeps Your Stop-Loss Active for Weeks
A regular stop-loss lasts only for the trading day. A GTT order, short for Good Till Triggered, stays active on the exchange-linked system for up to a year or until it is triggered. That makes it useful for shares you hold for delivery, because you do not need to re-enter the stop every morning.
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Remember that a GTT order is still a conditional order. If the stock opens far below your trigger price, the resulting order may behave very differently from what you expected.
Trailing Stop-Loss: Locking in Gains as the Price Rises
A trailing stop-loss moves up as the price moves in your favour and never moves down. If you buy at Rs 100 with a Rs 5 trail, the stop starts at Rs 95. When the price reaches Rs 120, the stop moves to Rs 115. If the price then falls to Rs 115, you exit with a gain instead of a loss.
Many platforms do not offer an automatic trailing stop, so traders raise the trigger price by hand as the trade works. The idea is the same: protect profit without capping the upside.
How to Choose Your Stop-Loss Level
- Use a nearby support level, and place the stop just below it so ordinary noise does not trigger it.
- Match the distance to the stock’s normal daily range. A volatile stock needs a wider stop than a calm one.
- Decide the amount you can afford to lose first, then size the position so the loss at your stop stays within that amount. This is basic position sizing.
- Never move a protective stop further away after a trade turns against you.
A sensible stop-loss level sits just beyond normal price noise, such as below a recent swing low. Match the stop-loss level to your position size so that one failed trade costs only a small part of your capital.
Common Stop-Loss Mistakes to Avoid
The first mistake is a stop that is too tight, which gets hit by routine swings. The second is no stop at all on a position funded with borrowed money. A third is relying on a stop in an illiquid stock, where the price can jump past your trigger. On a sharp market-wide fall, even a large stock such as those in the Nifty 50 can slip through a stop, so treat the stop as risk management, not a guarantee.
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Conclusion
A stop-loss order is a plan made in advance, when you are calm, and carried out when you may not be. Choose SL when you care about the exit price and SL-M when you care about getting out, use a GTT order for delivery positions, and raise a trailing stop as a trade works.
Set the level before you enter, size the position around it, and accept that gaps and thin trading can still produce a worse fill than planned.
Disclaimer: Data and figures in this article are sourced from publicly available information. These may or may not be accurate. Please verify all data with the official NSE (nseindia.com) and BSE (bseindia.com) websites before making any investment decision. Investments in securities are subject to market risk. This content is for educational purposes only and is not investment advice by Univest (SEBI RA INH000013776).
Frequently Asked Questions
What is a stop-loss order in simple words?
Ans. A stop order is an instruction to sell a share automatically when its price falls to a level you set. It limits the loss on a trade without you having to watch the screen. The order only activates when the trigger price is touched.
What is the difference between SL and SL-M?
Ans. An SL order converts into a limit order at your chosen price once the trigger is hit, so it may not fill if the price moves too fast. An SL-M order converts into a market order and fills at the best available price, so it exits but at a price that can be below your trigger.
What is a trigger price?
Ans. The trigger price is the level at which a protective stop becomes active. Until the market touches it, the order stays dormant. For a sell stop-loss, the trigger sits below the current price, and for a buy stop on a short position it sits above.
How long does a GTT order stay valid?
Ans. A GTT order stays active until it is triggered, cancelled or it reaches its expiry, which is up to one year on most platforms. This is much longer than a regular day order, which lapses at the close of the session.
Does a stop-loss guarantee that I will not lose more than my limit?
Ans. No. If a share opens sharply lower because of news, it can skip your trigger price entirely and fill well below it. An SL order may not fill at all in that case. A protective stop reduces risk but it cannot remove it.
What is a trailing stop-loss?
Ans. A trailing stop-loss follows the price upward by a fixed amount or percentage and never moves down. It lets you lock in gains as a trade works while still giving the position room to run. Many platforms need you to raise the trigger manually.
Should I use a stop-loss for long-term investments?
Ans. Long-term investors often rely on their original thesis and on position size rather than a tight stop. Some use a wide GTT stop as a safety net against a large unexpected fall. The right choice depends on your time horizon and how much loss you can bear.
