Absorption

What it is

Absorption is what happens when aggressive volume on one side meets enough passive size on the other side that price stops moving. Buyers pay up, again and again, but the offer keeps refilling. Delta keeps growing in one direction while price barely budges. Somebody on the passive side is soaking up the initiative orders.

The technical signature is the contradiction: significant aggressive volume — clearly directional, often well above the bar's typical activity — combined with limited price travel. In a healthy trend, a large positive delta drives price higher. In absorption, the same large positive delta drives price… nowhere.

The reason absorption is a watched pattern is that it's a causal signal of an imbalance between aggression and resting liquidity. Aggressors are doing the work; passives are getting filled at favourable prices. If absorption holds, the aggressors eventually stop pushing — and price usually reverses, because the demand (or supply) that was driving the move is exhausted.

Why it matters

• It identifies who is winning the auction at a specific level, in real time.
• It signals likely reversal or rotation when it occurs at a structural level (session high/low, prior POC, value area edge).
• It precedes many of the cleanest fade setups in intraday futures.

Absorption is also the inverse signal of breakout participation: a level where buyers absorb sellers is exactly not the level where you want to short into; one where sellers absorb buyers is exactly not the level to chase long.

How traders use it on Sierra Chart

Sierra Chart traders typically detect absorption through a combination of footprint reads and delta vs price behaviour. The classic Numbers Bars signature is a price row at the bar high with very heavy ask volume but no break of that price — buyers paid up, sellers refilled, the auction stalled. Bar-level absorption is read as strongly positive delta with a small or negative bar body.

Some traders watch market depth alongside the footprint — a level showing persistent large resting size that keeps refilling as it gets hit is the classic depth-side absorption read.

Common patterns / pitfalls

• Absorption is only meaningful at levels. Mid-range absorption is usually noise; absorption at a session extreme or prior POC is high-information.
• Single absorption bars often need confirmation — a second bar that fails to break the absorbed level, or a delta reversal.
• Heavy delta with limited price movement is necessary but not sufficient. Wide-spread instruments or news-driven flow can produce the same statistical pattern without it being genuine absorption.
• Absorption that breaks (the absorbed level fails) is itself a strong continuation signal — what passives were defending has finally given way.
• Don't confuse absorption (passive holding back aggression) with iceberg orders (large hidden resting size) — both produce similar footprints but the mechanics differ.

Related SCS studies

Delta Candle Color makes absorption easier to spot by coloring bars where price action and delta sign disagree, which is the classic bar-level absorption fingerprint.