Imbalance

What Is an Imbalance?

An imbalance in the order flow context refers to a significant disparity between buying and selling volume at a specific price level in the footprint chart. It occurs when the volume on one side (bid or ask) exceeds the other side by a defined ratio — typically 300% or more.

The imbalance is calculated by comparing the ask volume of a price level with the bid volume of the level below it (diagonally). This diagonal calculation reflects the actual mechanism of price movement: an aggressive buyer at the ask is fighting against a passive seller at the bid below.

Types of Imbalances

Ask Imbalance (Buying Imbalance)

An ask imbalance occurs when the ask volume at a level significantly exceeds the bid volume of the level below. This indicates strong aggressive buying pressure.

Bid Imbalance (Selling Imbalance)

A bid imbalance occurs when the bid volume at a level significantly exceeds the ask volume of the level above. This indicates strong aggressive selling pressure.

Reading Imbalances in the Footprint Chart

Most order flow platforms visually highlight imbalances — typically through color-coding the affected cells in the footprint chart:

• Green/Blue: Ask imbalances (buying pressure)
• Red: Bid imbalances (selling pressure)

Single Imbalance

A single imbalance at one price level has limited significance on its own. It shows that an imbalance existed at that tick, but no reliable signal can be derived from it alone.

Stacked Imbalances

When imbalances occur on three or more consecutive price levels in the same direction, this is called a stacked imbalance. These have significantly higher signal value, as they indicate coordinated aggressive pressure.

Imbalances in the Trading Context

Imbalances as Entry Signals

Strong stacked imbalances occurring in the direction of an existing trend can serve as confirmation for an entry. They show that aggressive market participants are supporting the trend direction.

Imbalances as Reference Levels

Price levels where strong imbalances occurred can function as future support or resistance zones. The logic: aggressive institutional activity was present at these levels, which may reactivate on revisit.

Imbalances and Absorption

When a strong imbalance occurs but price does not move in the direction of the disparity, an absorption by the opposite side may be taking place. This constellation is one of the strongest reversal signals in order flow.

Configuring Imbalance Ratios

The imbalance ratio is configurable. Common settings:

• 150%: Sensitive, many imbalances displayed — suitable for illiquid markets
• 300%: Standard, well-suited for most futures markets
• 400-500%: Conservative, only extreme disparities are highlighted

The right setting depends on the instrument and desired sensitivity.

Frequently Asked Questions

Is every imbalance a trading signal?

No. Individual imbalances are frequent and have little significance alone. Only in context — as a stacked imbalance, in combination with other order flow signals, or at key levels — do they become relevant signals.

Why is the imbalance calculated diagonally?

The diagonal calculation (ask of one level vs. bid of the level below) reflects market mechanics: when buyers become aggressive at the ask, they push price upward, and the relevant counterparty is the seller at the bid level below.

What imbalance ratio should I use?

For most futures markets (ES, NQ, CL), a ratio of 300% is a good starting point. Experiment with higher values if you want to see fewer but stronger signals.