Sweep

A sweep is an aggressive sequence of market orders that consume all available liquidity at multiple consecutive price levels without pause. Rather than allowing passive limit orders to refill between transactions, the sweep blows through the entire order book depth in a single burst.

What a sweep looks like on the tape

During a sweep, the Time and Sales feed shows:

• Rapid-fire prints hitting ask (buy sweep) or bid (sell sweep)
• Multiple price levels printing within milliseconds
• Often large individual sizes or many smaller prints in quick succession
• The tape moves so fast it appears as a blur during live trading

On a footprint chart, a sweep shows up as a column of high ask volume (or bid volume) stacked across multiple price rows within a single candle, with delta heavily skewed in one direction.

Types of sweeps

Buy sweep: aggressive buyers consume all ask-side liquidity, driving price up through multiple levels. Often seen at breakouts from consolidation or key resistance.

Sell sweep: aggressive sellers consume bid-side liquidity, driving price down through multiple levels. Seen at breakdowns or when panic selling hits a level.

Sweep vs normal price movement

Normal price movement occurs tick by tick with reasonable pauses for liquidity to refill. A sweep bypasses this: it is the market equivalent of someone urgently buying everything available regardless of price.

This urgency is the signal. Sweeps are almost never retail activity. They represent an institution, algorithm, or large participant with time-sensitive execution: they need a position immediately and cannot wait.

What happens after a sweep

Sweeps frequently mark the start of a new leg or the acceleration of an existing trend. However, if the sweep fails to produce sustained follow-through: price sweeps up but immediately reverses back: it is often a liquidity grab or stop run, and the opposite direction becomes the higher-probability play.