Order Flow Basics

What Is Order Flow?

Order flow is the real-time activity of buy and sell orders entering the market. It reveals the intentions of market participants and helps traders understand who is in control — buyers or sellers. Unlike traditional indicators, order flow focuses on the actual transactions that move price.

Market Orders vs Limit Orders

The interaction between market and limit orders forms the foundation of order flow. Market orders create movement, while limit orders provide liquidity.

• • Market orders — execute immediately at the best available price
• • Limit orders — rest on the order book and wait to be filled
• • Price moves when market orders consume available liquidity

The Role of Liquidity

Liquidity determines how easily price can move. When liquidity is thin, even small orders can cause large price movements. When liquidity is high, price moves more smoothly. Institutions seek liquidity to fill large orders without causing slippage.

Absorption and Aggression

Order flow reveals whether buyers or sellers are aggressive. Aggressive traders use market orders, while passive traders use limit orders. Absorption occurs when passive orders absorb aggressive pressure without allowing price to move.

• • Aggressive buying — market buy orders lifting the ask
• • Aggressive selling — market sell orders hitting the bid
• • Absorption — large limit orders preventing price from moving

Footprint Charts

Footprint charts display the volume traded at each price level. They help traders identify imbalances, absorption, and areas where institutions are active. These charts provide a deeper view of market behaviour than standard candlesticks.

Delta and Volume Imbalance

Delta measures the difference between aggressive buying and aggressive selling. A positive delta indicates buying pressure, while a negative delta indicates selling pressure. Imbalances highlight areas where one side dominates the other.

Order Flow and Market Structure

Order flow confirms market structure concepts such as BOS (Break of Structure) and CHOCH (Change of Character). A structural break supported by strong delta or volume imbalance is more reliable than one without order flow confirmation.

Conclusion

Order flow provides a deeper understanding of how markets move. By analysing market orders, liquidity, delta and imbalances, traders gain insight into institutional behaviour and can make more informed decisions.