Order Flow Analysis

Order Flow Analysis goes beneath the surface of candlestick charts to examine the actual mechanics by which price moves. Every trade requires an aggressor — a party willing to cross the spread and execute at the prevailing offer (buy aggressor) or prevailing bid (sell aggressor). By tracking whether volume is hitting the bid or lifting the offer, analysts attempt to identify which side is in control of the market at any given moment.

The primary tool is the Footprint Chart (also called a Cluster Chart or Order Flow Chart), which subdivides each candlestick into a grid showing the volume traded at each price tick, split between trades that occurred at the bid and trades at the offer. Vertical imbalances — where the volume at the offer significantly exceeds the volume at the bid at the same price row — signal aggressive buying. A sequence of such imbalances rising through a candle is called a 'buying imbalance stack' and can precede upward price movement.

Tape reading, the original form of order flow analysis practised before electronic markets, involved interpreting the ticker tape for patterns in print size, frequency, and direction. In modern electronic markets on NSE, tape reading translates into monitoring the Time and Sales feed for clusters of large prints at consistent prices, which may indicate institutional accumulation.

Absorption is a critical order flow concept. It occurs when a large cluster of aggressive orders on one side is absorbed by passive limit orders on the other side without price moving significantly. If price fails to advance despite repeated buy imbalances, it suggests a large seller is absorbing that demand — a bearish signal. Conversely, if aggressive selling cannot push price lower because buyers absorb every print, a reversal may be imminent.

Delta is the net difference between volume traded at the offer and volume traded at the bid within a candle or period. Positive delta indicates net buying aggression; negative delta indicates net selling aggression. Divergence between price movement and cumulative delta is a widely watched signal: if price rises to a new high but cumulative delta registers a lower high, it suggests the rally lacked genuine conviction.

For NSE equity derivatives, Level 2 data (order book depth) provides the raw material. However, exchanges in India do not provide public Footprint data directly; traders access it via third-party data feeds and charting platforms that reconstruct the bid-ask split from tick data. Order flow analysis is computationally demanding and better suited to traders with low-latency data connections.