ICT SIBI and BISI: The Complete Guide

Most ICT traders learn Fair Value Gaps as a single concept: a three-candle imbalance where the first candle's close and the third candle's open do not overlap. They mark every FVG the same way — a box on the chart — and enter when price retraces into the box. The problem is that FVGs have direction baked into their formation. A gap that formed during a bearish displacement and a gap that formed during a bullish displacement are not the same setup — they have opposite trade directions. Entering the wrong type in the wrong direction is one of the most frequent ICT entry errors.

SIBI and BISI are the ICT labels that solve this. Rather than marking every imbalance as a generic "FVG," the SIBI/BISI labelling system encodes the direction of the institutional order flow that created the gap — and therefore the direction in which the retrace entry should be placed. Understanding these labels does not introduce new concepts; it adds precision to one you already know.

SIBI — Sell Side Imbalance, Buy Side Inefficiency

SIBI stands for Sell Side Imbalance, Buy Side Inefficiency. Break it apart:

Sell Side Imbalance: When price drops aggressively, sellers are dominant. The imbalance is on the sell side — there are far more sellers than buyers at those price levels, driving the fast move lower. This dominance created the gap.

Buy Side Inefficiency: Because price moved so fast to the downside, buyers could not participate efficiently at those price levels. The gap represents zones where buyers were priced out — they could not get their orders filled at those levels during the downward displacement.

What SIBI looks like: SIBI is a bearish Fair Value Gap — a three-candle imbalance where the middle (largest) candle drops aggressively, leaving a gap between the first candle's close (above) and the third candle's open (below). The SIBI sits above current price — price fell away from it during the bearish displacement. When price subsequently retraces upward back into the SIBI zone, the institutional sellers from that displacement are still positioned. The retrace gives them an opportunity to add short positions at improved (higher) prices.

SIBI entry direction: SHORT. When price retraces into a SIBI from below, the entry is a short. You are entering in alignment with the institutional selling that created the gap. A SIBI is never a long entry target — entering a bearish imbalance as a long means buying into the zone where institutional sellers dominated.

BISI — Buy Side Imbalance, Sell Side Inefficiency

BISI stands for Buy Side Imbalance, Sell Side Inefficiency. The mirror of SIBI:

Buy Side Imbalance: When price rises aggressively, buyers are dominant. The imbalance is on the buy side — more buyers than sellers drove the fast move higher. This dominance created the gap.

Sell Side Inefficiency: Because price moved so fast to the upside, sellers could not participate efficiently at those levels. The gap represents zones where sellers were priced out.

What BISI looks like: BISI is a bullish Fair Value Gap — a three-candle imbalance where the middle candle rises aggressively, leaving a gap between the first candle's close (below) and the third candle's open (above). The BISI sits below current price — price rose away from it during the bullish displacement. When price subsequently retraces downward into the BISI zone, institutional buyers from that displacement are positioned. The retrace gives them the opportunity to add long positions at improved (lower) prices.

BISI entry direction: LONG. When price retraces into a BISI from above, the entry is a long. You are entering in alignment with the institutional buying that created the gap. A BISI is never a short entry target.

SIBI/BISI vs Regular FVG — Why the Labels Matter

SIBI and BISI are the same price structures as a Fair Value Gap. The three-candle identification is identical. What changes is the labelling system — and that labelling system prevents a specific, very common error.

When a trader marks every imbalance as "FVG" without distinguishing direction, they create a chart with bullish and bearish gaps indistinguishably labelled. In a bearish session, they see a gap above price and a gap below price. Both are labelled "FVG." Without understanding which is SIBI and which is BISI, the trader may enter the BISI below price as a short — entering bullishly-created institutional buying territory as a seller. Or they enter the SIBI above price as a long — entering bearishly-created institutional selling territory as a buyer. Both are countertrend entries against the institutional order flow that created the gap.

The SIBI/BISI labelling system eliminates this ambiguity by design. A SIBI label tells you immediately: this is a sell-side structure, the trade is short, the zone is premium. A BISI label tells you: this is a buy-side structure, the trade is long, the zone is discount. The label encodes the entry direction and the zone requirement simultaneously.

In summary: Every FVG is either a SIBI or a BISI. The question "is this FVG valid?" splits into two sub-questions: "Is it a SIBI in premium with bearish bias?" or "Is it a BISI in discount with bullish bias?" If neither condition is met, the FVG is not a valid entry zone regardless of how clean it looks structurally.

The Dealing Range Zone Filter — The Critical Rule

The zone filter is the most important application of SIBI/BISI labelling. A SIBI in premium is a valid bearish entry zone. A SIBI in discount is an invalid entry zone — it is a bearish gap in cheap territory, which contradicts the dealing range principle of selling from expensive (premium) and buying from cheap (discount).

The table produces a clean decision rule: a valid SIBI entry requires two conditions simultaneously — the gap is in premium AND the daily bias is bearish. A valid BISI entry requires the gap is in discount AND the daily bias is bullish. Any other combination is invalid regardless of the FVG's structural quality.

This is why Huddleston teaches the premium/discount framework before teaching FVG entries. Without the zone filter, FVG entries are 50/50 coinflips — the structural quality of the gap means nothing if it is in the wrong zone. With the zone filter encoded in the SIBI/BISI labels, the decision is immediate: SIBI in premium with bearish bias = valid. Everything else = wait.

Entry Mechanics — Trading SIBI and BISI

The entry mechanics for SIBI and BISI are identical to any other FVG entry in ICT. The SIBI/BISI label adds zone and direction context; the actual execution mechanics are unchanged.

Identifying the entry zone: The SIBI or BISI is defined by three candles. The gap spans from the first candle's close to the third candle's open (for a SIBI, the gap sits above the third candle; for a BISI, it sits below the third candle). Mark the top, bottom, and 50% CE (Consequent Encroachment — the midpoint) of the gap.

Entry level: The 50% CE of the gap. For a SIBI short entry: as price retraces upward into the SIBI, limit short is placed at the 50% CE of the bearish FVG. For a BISI long entry: as price retraces downward into the BISI, limit long is placed at the 50% CE of the bullish FVG.

Stop placement: Beyond the full gap extent. For a SIBI short: stop above the top of the SIBI (the first candle's close, plus a small buffer). For a BISI long: stop below the bottom of the BISI (the first candle's close on the bullish displacement, minus a buffer). The stop level is defined structurally — if price trades through the full gap, the institutional order flow that created the imbalance has been absorbed and the setup is invalid.

T1 and T2: Standard ICT targets. T1 at the nearest IRL (internal range liquidity) in the trade direction. T2 at the ERL (external range liquidity) — the daily draw on liquidity identified in morning preparation.

Additional confluence: When a SIBI or BISI overlaps with an Order Block, the result is a Balanced Price Range (BPR). This is the highest-confidence FVG entry — institutional buying or selling from the OB combined with the imbalance from the SIBI or BISI. When an OB, SIBI/BISI, and a liquidity sweep all align at the same level in the correct zone, this is the Unicorn Model — S-tier ICT entry.

1st Presented SIBI and BISI

The 1st Presented FVG concept applies directly to SIBI and BISI. The 1st Presented FVG is the first FVG that forms after a confirmed liquidity sweep and market structure shift. Using SIBI/BISI terminology: a 1st Presented SIBI is the first bearish FVG that forms after the BSL sweep and bearish MSS. A 1st Presented BISI is the first bullish FVG after the SSL sweep and bullish MSS.

This connection matters because it tells you which specific SIBI or BISI to enter. After a Judas Swing sweep on NQ: the MSS creates a bearish displacement candle. That candle creates the 1st Presented SIBI — the first bearish FVG in the distribution sequence. Entry is at the 50% CE of this SIBI on the retrace. This is the same as the 1st Presented FVG entry in the 2022 Model, just described with the SIBI label that encodes the direction explicitly.

SIBI/BISI in CRT Context

In Candle Range Theory, the Phase 2 retracement entry is specifically an entry into a SIBI or BISI. The CRT expansion candle (Phase 1) creates a displacement — if that expansion is bearish, the FVG inside the expansion candle's range is a SIBI. The Phase 2 retracement into that zone is the short entry at the SIBI 50% CE. If the CRT expansion is bullish, the FVG is a BISI and the Phase 2 entry is long.

This connection clarifies what makes a CRT Phase 2 entry valid in zone terms. A bearish CRT expansion must create a SIBI that sits in premium. A bullish CRT expansion must create a BISI that sits in discount. A bearish CRT that creates a SIBI in discount is a structurally valid CRT but a dealing-range-invalid entry. The SIBI/BISI zone filter applies to CRT entries exactly as it applies to all other FVG entries.

Higher Timeframe SIBI and BISI

SIBI and BISI exist on every timeframe. Daily and weekly SIBI/BISI zones are particularly significant because they represent institutional imbalances that accumulated over days or weeks — the order flow that created them was massive, the zone is dense, and the reaction when price returns to it is proportionally stronger.

Daily SIBI in weekly premium: A bearish FVG that formed on a daily candle during a week where NQ was in weekly premium is a double-premium SIBI — it is in premium on both the daily and weekly scale simultaneously. When price returns to this zone, it is entering an area of institutional selling dominance at two timeframes simultaneously. This is significantly higher probability than a same-day SIBI in a neutral weekly context.

Weekly BISI as a monthly support: A bullish weekly FVG that forms when NQ is in monthly discount is a zone where institutional buyers dominated at the weekly scale within a broader monthly bullish context. When intraday price retraces into this weekly BISI, the entry aligns with institutional buying at the weekly scale, the monthly discount positioning, and the intraday AMD bullish delivery simultaneously.

Scanning for higher timeframe SIBI/BISI during Sunday preparation — when identifying the monthly and weekly profile — adds the deepest reference zones to the intraday analysis. An intraday entry from a daily SIBI that sits in weekly premium and monthly premium has three timeframes of institutional selling context behind it. These are the setups to prioritise for full position sizing.

Common SIBI/BISI Mistakes

Entering a SIBI as a long or a BISI as a short. The fundamental error that SIBI/BISI labelling exists to prevent. A SIBI is an institutional bearish zone — entering it long means buying against the institutional selling that created it. This is the countertrend entry that looks like a gap fill but is actually entering the middle of a distribution. Enforce the rule absolutely: SIBI = short only. BISI = long only.

Trading a SIBI in discount or a BISI in premium. The zone filter is non-negotiable. A structurally valid SIBI in discount is still an invalid entry for the same reason a short entry from discount is always invalid — you are selling from cheap, against the dealing range structure. The gap's structural quality is irrelevant if the zone is wrong.

Confusing which type a gap is. Determining SIBI vs BISI from the chart should take two seconds: which direction did price move when the gap formed? If price dropped, the gap is SIBI. If price rose, it is BISI. The common confusion arises when looking at old gaps where the surrounding price action is complex. Simplify: find the three-candle pattern, identify the displacement candle (the large middle candle), determine its direction. That is the gap type.

Using SIBI/BISI without the sweep prerequisite. A SIBI that formed during a random mid-session drift (no preceding liquidity sweep) has far lower institutional significance than a SIBI that formed during the MSS displacement after a Judas Swing. The SIBI label tells you the direction. The 1st Presented FVG criteria tell you the priority. A SIBI without a preceding sweep is a C-tier entry at best. A 1st Presented SIBI after a BSL sweep in premium on a bearish day is S-tier. Both are SIBI — the gap label alone does not determine probability. The full context does.

Frequently Asked Questions