Markets don't stop moving just because the exchange is shut. News, data releases and sudden shocks still happen over a weekend — and when trading reopens, the price can be somewhere completely different from where it closed. That jump is a gap, and it's one of the few risks a stop-loss can't fully protect you from.
What a gap actually is
A gap is the difference between an instrument's closing price on Friday and its opening price when trading resumes — typically Sunday evening for forex, or Monday for many stock and index CFDs. Nothing trades in between, so there's no continuous price line for your stop to interact with. The market simply reopens at a new level.
Most weekend gaps are small. Occasionally they aren't: a surprise interest-rate move, an election result, a war headline or a company announcement over the weekend can open a market 1–5% away from Friday's close, sometimes more on individual stocks or during a genuine crisis.
Why your stop-loss doesn't stop the loss
A standard stop-loss is an instruction to close your position at the next available price once the market reaches your level — not a guarantee of the exact price you set. If the market gaps straight through your stop with no trading in between, your position closes at the first price available after the reopen, which can be well beyond where you intended to get out.
Worked example: you're long a position with a stop-loss 2% below Friday's close. Over the weekend, unexpected news breaks, and the market reopens 4% lower on Monday. Your position doesn't close at your 2% stop — it closes near the 4% reopen price, because there was no price in between at which the order could fill. The loss is double what you planned for.
This is separate from ordinary slippage during market hours, which is usually a fraction of a point. A weekend gap can be an order of magnitude larger, precisely because so much time — and so much potential news — passes with no trading at all.
Guaranteed stops are the one tool that actually caps it
Some brokers offer a guaranteed stop-loss order (GSLO), usually for an extra fee or a wider spread on that instrument, which closes your position at the exact price you set regardless of gaps. It's the only order type that removes weekend-gap risk entirely — an ordinary stop, however tight, does not. Whether a broker offers guaranteed stops, on which instruments, and at what cost is disclosed in its own order-execution or product documentation; check the specific broker's terms rather than assuming the feature exists.
What increases your exposure to a bad gap
- Holding CFDs or leveraged positions over the weekend at all. Closing before the market shuts and reopening a similar position Monday removes weekend-gap risk completely, at the cost of the overnight swap you'd otherwise pay or earn.
- Trading around scheduled weekend-adjacent events — a national election, a central bank meeting late Friday, an earnings date that falls right before close.
- Higher leverage. A gap that would be a manageable dent at low leverage can consume your entire margin at high leverage — see how leverage works and margin calls for why the buffer that absorbs a bad move shrinks as leverage rises.
- Illiquid or single-stock instruments, which tend to gap further than major currency pairs or broad indices on the same piece of news.
Crypto is a partial exception
Spot crypto markets trade continuously, so a "weekend gap" in the strict sense doesn't apply the same way — but crypto CFDs still see sharp, low-liquidity moves over weekends when trading volume thins out, and financing is charged on them every single day rather than just on the FX rollover days. See overnight holding costs for how that adds up.
Practical takeaways
- Treat a stop-loss as where you intend to exit, not a guaranteed exit price, especially around weekends and major scheduled news.
- Decide deliberately whether you're comfortable holding a leveraged position through a weekend, rather than defaulting into it.
- If your broker offers guaranteed stops on the instrument you're trading, read the cost and the conditions before assuming your risk is capped.
- Lower leverage gives a gap more room to move before it threatens your account — see risk management basics for sizing positions around a stop you can actually rely on.
Before choosing an account or instrument, compare brokers on what they actually disclose about execution, and check a broker's regulatory standing with our entity and licence checks.
Educational content, not financial advice. Illustrative figures only — every broker's execution policy and any guaranteed-stop terms are its own to disclose.