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Weekend Gap Risk, What Happens While the Market Sleeps

Forex closes on Friday evening and reopens Sunday evening. During that time, news can happen: elections, geopolitical events, central bank announcements. When the market reopens, price may start far from where it closed.

That difference is a gap, and it can jump right over your stop loss.

Example: you're long with a stop 30 pips below. Over the weekend, negative news hits. Price reopens 80 pips lower. Your stop executes at the first available price, meaning a loss much larger than planned.

While major forex pairs often gap only slightly, larger gaps can and do occur, especially around major events.

How to reduce the risk:

1. Close trades before the weekend. Many day traders avoid weekend exposure entirely.

2. Reduce position size. If you hold, cut the size to limit potential damage.

3. Check the news calendar. Look for weekend events, elections, or scheduled announcements.

4. Understand stop execution. A stop loss is not a guarantee of the exact price in gap situations.

5. Avoid holding through high-risk events. Some traders avoid positions near major scheduled risk.

6. Be aware of illiquid opens. Sunday openings often have wider spreads.

Holding through the weekend isn't always wrong, but it should be a conscious decision with adjusted risk, not an accident of forgetting to close.

Sleeping markets can still move.

A real example for anyone who thinks majors don't gap: after the first round of the French presidential election in April 2017, EURUSD opened Sunday evening roughly 2% higher than Friday's close, well over 150 pips. That one went in favour of euro longs, but any short with a 30 or 50 pip stop was filled at the Sunday price, not at the stop.

That's the mechanics of point 4 in practice. A stop is an order to close at the next available price once the level trades, and after a gap the next available price is the reopen. A stop-limit order avoids the bad fill but may leave you in the position altogether, which is often worse.

For a scalper the simple answer is flat by Friday afternoon. I also don't trade the first hour after the Sunday reopen at all, because spreads on the majors can be several times normal while liquidity comes back, and a "gap fill" scalp at those spreads is mostly paying the broker.

Fairman wrote: Example: you're long with a stop 30 pips below. Over the weekend, negative news hits. Price reopens 80 pips lower.

Your example is realistic, and it's worth knowing that 80 pips is not even an extreme case on the majors. After surprise weekend election results or referendum outcomes, gaps of a couple of hundred pips have happened on the pound and the euro over the years.

One practical point to add to number 3: check the calendar for Saturday and Sunday specifically. Elections are often held on Sundays in Europe, and some central banks and governments have made announcements over a weekend before. Those are the gaps that bypass stops.

On the Sunday open itself, there's an additional quirk. Spreads on most retail platforms are widest in the first hour, so even a small gap plus the spread can trigger stops that were placed close to Friday's close. If I'm holding, I keep stops well away from Friday's closing price and size down accordingly.