In plain language
In market microstructure, taking liquidity means sending an executable order that trades with orders already resting in the book. The aggressor requests immediate execution; passive orders supply liquidity.
The second slang use
On charts, the phrase is also used for a liquidity grab: price crosses a high, low, or area where stops are expected and then reacts. This is an interpretive pattern, not the same technical definition as liquidity taking.
Observable data
Order and execution feeds may show aggressor side, quantity consumed, levels crossed, and impact. A price chart does not necessarily reveal stops, cancelled orders, hidden liquidity, or the identity of the participant.
What it does not prove
Crossing a level does not automatically prove a stop hunt, manipulation, or price reversal. Reconstruction requires venue, event sequence, book data, trades, and market rules; an allegation of misconduct also requires evidence of conduct and intent.
Sources
- CME Group, Assessing liquidity — Distinguishes passive participants supplying liquidity from aggressive orders demanding it.
- CME Group, Understanding the CME Liquidity Tool Methodology — Shows how book quantity and levels determine the cost and impact of an executable order.
- FINRA, Manipulative Trading — Frames surveillance and evidence for potentially manipulative trading practices.