What is overnight risk in trading?
In one line: Overnight risk is the chance that price moves sharply between one session's close and the next open, often jumping past your stop.
A simple example
You buy 100 shares at $50 with a Stop loss at $48. You're risking $2 a share, or $200.
After the 4:00 pm ET close, the company reports weak earnings. The next morning the stock opens at $44. Your stop triggers, but the first price available is around $44.
Loss: $6 a share, $600. That's three times what you planned, from one overnight Gap. A math example, not a forecast.
Where it comes from
- Earnings and company news, often released before the open or after the close. See Earnings report.
- Economic data like CPI or the jobs report at 8:30 am ET, an hour before US stocks open.
- Events abroad while US markets are closed.
- Weekends. Forex and futures close Friday 5:00 pm ET and reopen Sunday evening. See weekend gaps explained.
Why it matters
A stop order isn't a promise of price. When a market opens past your stop, it becomes a market order and fills at the next available price. That's why holding through closed hours can change your real risk.
Futures and forex trade nearly around the clock, so true gaps are rarer, but thin overnight hours can still bring sharp moves and wide Spreads.
Ways to manage it
- Be flat before the close if you day trade.
- Check the calendar for earnings and big data before holding overnight.
- Size smaller for trades you'll hold. Assume the loss could be larger than your stop.
A common mistake
Treating a swing trade like a day trade. The same size that's fine during the day can be too big overnight, because the stop protects less.
In your plan, write one rule: "I only hold overnight if the size still feels small at twice my stop distance."
Questions
Do stop losses work overnight?
They stay active at many brokers, but they can't fill while the market is closed. At the open they trigger and fill at the first available price, which can be past your stop.
How do traders avoid overnight risk?
Many close every trade before the session ends. Others hold smaller positions and avoid earnings or big data nights.
Is overnight risk the same as weekend risk?
Weekend risk is a longer version of it. More time closed means more chance of news, and bigger gaps when trading resumes.
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