i Short answer
Gap trading targets the price difference between one session's close and the next session's open.
This is more directly relevant to shares and indices, though forex still experiences weekend gaps.
📋 ON THIS PAGE
1. What a price gap actually is
A price gap occurs when an instrument's price opens at a meaningfully different level than where it closed during the previous session, without trading through the intermediate prices in between, typically reflecting new information or developments that emerged while that specific market was closed.
It's worth understanding why gaps occur mechanically, they typically reflect genuine trading activity or news developing while a specific market was closed, once trading resumes, price adjusts immediately to reflect this new information, creating the visible jump rather than a gradual transition.
3. The weekend gap phenomenon in forex specifically
While forex trades continuously throughout the trading week, it does close over the weekend, meaning significant weekend news or developments can produce a genuine, visible gap when forex markets reopen on Monday compared to where they closed the previous Friday. This weekend gap is the most directly relevant gap phenomenon for forex traders.
It's worth checking your open positions specifically before the weekend closure if you know significant news is expected over the weekend, discussed elsewhere on this site regarding trading around major events, since weekend gaps represent forex's primary genuine gap risk worth planning around.
4. Common gap trading approaches worth understanding
Some traders specifically anticipate that a gap will "fill", meaning price eventually retraces back to close the gap and trade through the previously skipped price levels, while others trade in the direction of the gap, anticipating that whatever significant news caused it will continue driving price further in that same direction, essentially the same momentum-versus-mean-reversion philosophical divide seen elsewhere in trading.
It's worth backtesting whichever specific gap trading approach interests you, discussed elsewhere on this site regarding backtesting generally, before committing real capital, confirming through your own historical analysis whether these general patterns genuinely hold for your specific traded instruments.
5. The genuine risk gap trading carries
Gaps inherently mean your stop-loss or other pending orders might execute at a significantly different price than intended, since the gap itself represents exactly the kind of discontinuous price movement that creates elevated slippage risk during high-volatility periods.
It's worth being especially cautious about position sizing for any genuine gap-trading strategy, given how quickly and unpredictably gaps can move, a stop-loss order can't protect you from a gap that jumps straight past your specified level, worth respecting this elevated risk accordingly.
6. Is gap trading relevant to typical day traders
For most forex day traders, weekend gaps are the primary relevant consideration, mainly affecting positions held open over a weekend, since day trading by definition avoids holding positions overnight or over weekends. Gap trading as a dedicated strategy is generally more relevant to share and index traders than to forex day traders specifically.
Equity markets close overnight and frequently reopen with gaps. Forex trades nearly continuously, so gaps are rare and mainly seen at the Monday open, or after significant news events over the weekend.
★ Why It Matters
Worth checking if you trade ZAR pairs over weekends: the Sunday open gap size relative to Friday's close has at times been noticeably larger for emerging-market pairs than for major currency pairs, given their typically thinner weekend liquidity.
✕ Common mistakes
- Assuming forex gaps behave identically to share market gaps. Forex gaps occur specifically over weekends, a distinct dynamic from intraday equity gaps.
- Trading immediately at the Sunday open without checking the gap size first. A wide gap warrants extra caution before committing to a position.
- Treating gap trading strategies built for shares as directly transferable to forex. The underlying mechanics and frequency of gaps differ between these markets.
Key Takeaways
- Gap trading targets the price difference between one session's close and the next open, more relevant to share and index trading than continuous forex markets.
- Gap trading targets the price difference between one session's close and the next session's open.
- This is more directly relevant to shares and indices, though forex still experiences weekend gaps.
- What a price gap actually is.
- Why gaps are more pronounced on shares and indices specifically.
Frequently asked follow-up questions
Should I always expect weekend gaps to fill?
Not always. This is one possible pattern among others, rather than a guaranteed, reliable rule applicable to every specific gap.
Can I avoid weekend gap risk entirely as a day trader?
Yes, since day trading by definition closes positions before the trading day ends, day traders generally avoid holding positions through the weekend entirely.
Are gaps more common during certain times of year?
Gaps can occur around any significant unexpected news, though periods with major scheduled events or holidays can sometimes see more pronounced gap activity.
