Price Gap

A price gap is a sudden, discontinuous jump in an asset's quoted price from one level to another, where no trades occur at any intermediate price.

Quick Definition Box

A price gap occurs when the market opens or moves sharply, skipping price levels. This creates a visible "hole" on a chart. For traders, gaps matter because they can trigger slippage, stop-loss hunting, or missed fill prices, especially in fast-moving markets or after news events.

Detailed Explanation

Price gaps are not random artifacts; they reflect a fundamental shift in supply and demand that happens faster than the market can print continuous prices. In a normal, liquid market, prices move in small increments (ticks or pips) because buyers and sellers are constantly matching orders. A gap appears when the last traded price before an event and the first traded price after it are far apart, with no intermediate transactions.

There are four classic types of gaps, classified by their context and predictive value:

1. Common gaps — occur in low-liquidity periods (e.g., midday or during thin trading) and are usually small. They often get "filled" quickly as price returns to the pre-gap level.
2. Breakaway gaps — appear at the start of a new trend, often after a consolidation pattern. They signal strong momentum and are less likely to be filled soon.
3. Runaway gaps (or measuring gaps) — happen mid-trend, showing that the trend is still strong. They can appear in a series.
4. Exhaustion gaps — occur near the end of a trend, often after a sharp move. They signal that the last push of buyers (or sellers) is fading, and a reversal may follow.

For execution, the most relevant type is the overnight gap — the difference between yesterday's close and today's open. This is especially common in forex, where the market closes on Friday and reopens on Sunday evening (UTC). Over the weekend, economic news, political events, or central bank decisions can shift the fundamental outlook, so when trading resumes, prices jump to a new equilibrium. For example, if the U.S. releases unexpectedly strong employment data on Friday afternoon, the USD may gap higher against other currencies when the forex market reopens.

Gaps also occur intraday during high-impact news releases (e.g., central bank interest rate decisions, CPI reports) or when a major liquidity provider withdraws from the market. In such moments, the bid-ask spread widens dramatically, and the "last price" can jump several pips (or even tens of pips) in a single tick.

Real-World Example

Imagine you are trading EUR/USD. On Friday, the market closes at 1.0850. Over the weekend, the European Central Bank announces an unexpected rate hike. When the market reopens on Sunday at 10:00 PM GMT, the first quoted price is 1.0920. That is a 70-pip gap — no trades happened between 1.0850 and 1.0920.

Now, suppose you had a buy stop order at 1.0860, placed before the weekend. When the market opens, price is already above your level. Your order will be filled at the first available price, which is 1.0920 — not 1.0860. That is a 60-pip difference between your intended entry and your actual fill. This is a classic example of gap slippage.

Conversely, if you had a sell stop (stop-loss) at 1.0840, the market opening at 1.0920 means your stop-loss is triggered at 1.0920, not 1.0840. You lose 80 pips more than planned. This is why many traders widen their stops before weekends or high-impact news.

Why It Matters for Traders

Gaps directly affect execution quality and risk management. Here is what you need to understand:

• Stop-loss orders are not guaranteed prices. In a gap, your stop becomes a market order, filled at the next available price. The further the gap, the worse the fill.
• Limit orders can become "unfillable" or fill at a better price. If you have a buy limit below the market and the price gaps down through it, your order may fill at the gap price, which is better than your limit. But if the gap skips your level entirely, you get no fill.
• Slippage is not always negative. In a gap up, a buy market order gets a worse price (negative slippage). In a gap down, a sell market order also gets a worse price. But if you are on the opposite side (e.g., selling into a gap up), you may get a better price than the last close.
• Volatility and liquidity are intertwined. Gaps are more common in low-liquidity instruments (exotic forex pairs, small-cap stocks, or during off-hours). Major pairs like EUR/USD have fewer gaps because of deep liquidity, but they still gap on major news.
• Backtesting and strategy design must account for gaps. If your backtest assumes continuous prices, your results will be overly optimistic. Real fills will differ.

Common Misconceptions

1. "Gaps always get filled."
   Fact: This is a myth. While common gaps often fill, breakaway and runaway gaps frequently do not. A gap that occurs after a major fundamental shift (e.g., a war, a central bank surprise) may never be filled because the new price level reflects a permanent change in value.

2. "A gap is the same as slippage."
   Fact: They are related but distinct. Slippage is the difference between the expected price and the actual fill price. A gap is the cause of that difference. Slippage can also occur without a gap (e.g., due to slow order routing or thin order books), but a gap almost always causes slippage.

3. "Market makers prevent gaps."
   Fact: Market makers provide liquidity by quoting bid and ask prices, but they cannot prevent gaps caused by fundamental news or weekend closures. In fact, during extreme volatility, market makers may widen spreads or go "off quote" (stop quoting), which can make gaps worse. Their role is to manage risk, not to guarantee continuous prices.

Related Terms

• ecn — Electronic Communication Network; a system that matches orders directly, often showing the true market depth where gaps are visible.
• stp — Straight Through Processing; a routing method that sends orders directly to liquidity providers, reducing manual intervention but not eliminating gaps.
• market-maker — A firm that quotes both buy and sell prices; its behavior affects spread and gap frequency.
• no-dealing-desk — A broker model that passes orders directly to the interbank market, where gaps originate from underlying liquidity.
• slippage — The difference between the expected fill price and the actual fill price, often caused by gaps.

How XM Compares

XM operates as a No Dealing Desk (NDD) broker for most account types, meaning client orders are routed directly to liquidity providers without a dealing desk intervention. This model generally results in faster execution and tighter spreads during normal conditions. However, XM — like all brokers — cannot prevent price gaps that originate in the underlying interbank market. During weekends, news events, or market openings, XM's execution may experience slippage due to gaps, and the company's policy is to fill orders at the first available price after a gap occurs. XM also offers a Market Execution model, where orders are filled at the best available price, which may differ from the requested price during gaps. For specific details on slippage protection, order execution, and weekend trading hours, traders should always refer to the official XM website and the terms and conditions of their specific account type.

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⚠️ Disclaimer: This glossary entry is educational. Forex/CFD trading carries high risk. This is not investment advice.

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