Every trade has two sides: an aggressor who crosses the spread, and a passive participant whose resting order is filled. Price moves only when aggressive demand at a level exceeds the liquidity resting there and the level is depleted.
01What absorption looks like
Absorption describes periods in which sustained aggressive flow in one direction meets passive liquidity that does not give way. Volume executes, often heavily, yet price barely moves. The resting side is either large, or it is being refreshed as quickly as it is consumed.
In the data, absorption shows up as a high ratio of executed aggressive volume to price change, repeated prints at the same price, and size at the best price that persists, or reappears, after being traded into.
02Genuine absorption or temporary imbalance
Not every pause under heavy flow is absorption. The same surface pattern can come from a single large passive order that is eventually exhausted, from liquidity providers pausing in a way that slows the market without offering real resistance, or from data in which trades and book updates arrive out of sequence.
The distinguishing questions are about persistence and replenishment. Does the resting size regenerate after it is hit? Does the aggressive side keep committing, or does it fade? And when the flow stops, does price move away from the level, or simply resume?
Volume without displacement is information, but only once it persists.
03Cautions
Absorption describes an interaction; it is not a forecast. A level that absorbs flow can still break when the passive participant completes or withdraws. Measuring it well depends on clean, correctly sequenced trade and quote data, and on not drawing conclusions from a handful of prints.
Insights are research notes published for general information and education. They describe market mechanisms, not the firm’s positions or results. They are not investment advice or research recommendations, and nothing in them is an offer or solicitation.