Why Fair Value Gaps Get Filled — And When They Don'tE-mini Nasdaq-100 FuturesCME_MINI_DL:NQ1!EmpArchitectNot every gap fills. Understanding which ones do — and why — is the difference between trading inefficiency and chasing price. █ WHAT IS A FAIR VALUE GAP A Fair Value Gap forms when a candle's range doesn't overlap with the candle two bars earlier. Price moved so aggressively that no trading occurred in between. That untouched zone is an inefficiency — institutional displacement left a gap in the order flow. The standard ICT framework says price tends to return and fill these gaps. But "tends to" is not "always." The fill rate depends on context. This is structure analysis, not a trade signal. The FVG tells you where imbalance exists — not what price will do next. Both directions remain possible until structure confirms. █ WHEN GAPS FILL Gaps fill most reliably in ranging or mean-reverting environments. When price displaces into a level but lacks follow-through, the gap behind it becomes a magnet. Buyers or sellers who missed the initial move place orders inside the gap, creating a gravitational pull back toward inefficiency. On this NQ 15m chart, notice the FVGs that formed during displacement moves. As momentum slowed, price retraced into each gap — most filling to at least the Consequent Encroachment (50%) level before reacting. The CE level is where price often decides: fill halfway and respect, or push through for a full fill. █ WHEN GAPS DON'T FILL Gaps don't fill when the move behind them is structurally supported. If an FVG forms after a sweep of liquidity + CHoCH + displacement, the institutional intent behind that gap is strong. Price has no reason to return — the orders are already filled. Unfilled gaps in a trending environment are continuation signals, not reversal zones. A gap that remains open for 50+ bars in a strong trend was never meant to fill — it was the launchpad. █ WHAT THE DATA SHOWS The FVG Detector dashboard on this chart tracks fill rates in real time. On NQ 15m across the visible range: Bullish FVG fill rate: 95.4% (557 of 584 filled) Bearish FVG fill rate: 93.9% (504 of 537 filled) Overall: 94.6% across 1,121 detected gaps Average time to fill: 13.2 bars ~95% of gaps fill. That means the default expectation is clear — most inefficiencies get rebalanced. The edge is in identifying the ~5% that don't. Those unfilled gaps are almost always in the direction of the dominant trend with displacement + structure behind them. The gaps that fill quickly are counter-trend or formed during consolidation without structural support. █ BOTH SCENARIOS Bullish case — unfilled bullish FVGs below price are demand zones. If trend structure holds and these gaps remain open, they represent institutional support. Price may never return. Bearish case — if price starts filling FVGs that previously held, the structure is weakening. A gap that acted as support and then gets fully filled is no longer demand — it's broken. Look for BOS confirmation on the other side. █ KEY TAKEAWAY Not all gaps are equal. A gap with displacement + structure + trend alignment behind it is a continuation signal. A gap in consolidation without follow-through is a fill target. The fill rate tells you which environment you're in — check the dashboard before assuming price "has to" return. Chart: NQ 15m · FVG Detector & Analytics · Default settings