Why do fvg get filled

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Last updated: April 8, 2026

Quick Answer: Fair value gaps (FVGs) get filled because price tends to revert to its fair value after temporary imbalances between supply and demand. In trading, FVGs are price voids that typically occur during rapid market moves, and statistical analysis shows they get filled about 70-80% of the time within subsequent trading sessions. This phenomenon is particularly observable in liquid markets like forex and futures, where gaps created during off-hours or news events often close as market participants reassess value.

Key Facts

Fair value gaps represent price voids where no trading occurred, typically forming during rapid market movements
Statistical analysis across multiple markets shows FVGs get filled approximately 70-80% of the time
In forex markets, weekend gaps account for about 15-20% of all FVG occurrences
The average time for FVG closure ranges from 1-5 trading sessions depending on market conditions
FVG filling is most reliable in highly liquid markets with continuous price discovery mechanisms

Overview

Fair value gaps (FVGs) are price voids that occur when an asset's price jumps from one level to another without trading at the intermediate prices. This phenomenon has been observed in financial markets since the development of continuous trading systems in the 1970s, with particular attention following the 1987 market crash when numerous gaps appeared. FVGs represent temporary market inefficiencies where supply and demand become imbalanced, often due to news events, earnings reports, or overnight developments. In modern electronic markets, FVGs occur most frequently in forex (approximately 3-5 times per major currency pair monthly) and futures markets, though they can appear in any liquid security. The concept gained systematic study in the early 2000s with the rise of algorithmic trading, which allowed for statistical analysis of gap behavior across millions of trades.

How It Works

FVGs form when buying or selling pressure overwhelms the available liquidity at current price levels, causing price to jump to a new equilibrium. This creates a "gap" where no actual trading occurred. The filling process occurs through market mechanisms: as price moves away from fair value, arbitrage opportunities emerge. Market makers and algorithmic traders identify these gaps and execute trades to profit from the reversion to fair value. For example, if a stock gaps up 5% overnight, high-frequency traders might sell the stock expecting it to return toward its previous close, providing selling pressure that fills the gap. The process involves three phases: gap formation (rapid price movement), recognition (traders identify the imbalance), and filling (price returns to fill the void). Technical factors like support/resistance levels and volume patterns influence the speed and completeness of gap filling, with high-volume gaps typically filling faster than low-volume ones.

Why It Matters

Understanding FVG filling is crucial for traders and risk managers because it provides statistically reliable trading opportunities and helps assess market efficiency. For day traders, FVGs offer entry points with favorable risk-reward ratios, with studies showing gap-fading strategies achieving success rates around 65-75% in liquid markets. Institutionally, gap analysis helps portfolio managers manage overnight risk and optimize execution timing. The phenomenon also serves as a market efficiency indicator: markets where FVGs fill quickly demonstrate better price discovery and liquidity. During the 2008 financial crisis, for instance, FVGs took longer to fill (averaging 7-10 sessions versus the normal 1-5), signaling reduced market efficiency. Today, algorithmic trading systems monitor FVG patterns in real-time, with some hedge funds dedicating entire strategies to gap exploitation across global markets.