What is a Stop Loss? — AI Glossary

What it is: A pre-set exit that closes a position once it moves against you by a fixed amount.
Who it is for: Anyone letting a tool or a rule manage risk on their behalf.
Best if: You want the size of a loss decided in advance rather than in the moment.
Skip if: You expect it to guarantee your exit price. It does not. Want one practical AI workflow every morning? Subscribe to our free daily newsletter.

What is a stop loss?

You decide before entering that you will exit if the price falls a set amount, say 5%. The rule then does it for you, which removes the decision from the moment you are least able to make it well.

Why the size of the stop matters

A stop has to be sized against how much the thing normally moves. A stock that swings 8% in a routine day will breach a 5% stop constantly, on ordinary noise, long before any idea has room to work.

This is why many traders size stops against average daily range rather than a flat percentage. A fixed percentage applied across calm and wild positions alike quietly does most of the damage.

What a stop cannot do

It is a trigger, not a guarantee. If a price gaps overnight, your exit happens at the next available price, which can be well past your level.

A stop also cannot rescue a bad entry. It limits how much a mistake costs, which is not the same as preventing one.

Related terms

• What is a drawdown?
• What is a moving average?
• What is a VCP?

Learn more on Beginners in AI

• I tested TrendSpider AI on 2 trading strategies
• Are AI trading bots a scam?
• Which brokers let AI trade?

Sources and further reading

• Grokipedia: Order types

Last reviewed: August 2026. AI terminology evolves quickly — verify specifics on the official source pages above.

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