Accumulation/Distribution Line
The Accumulation/Distribution Line is a volume-weighted indicator developed by Marc Chaikin that uses the relationship between a security's closing price and its intraday high-low range to measure cumulative buying and selling pressure.
Marc Chaikin developed the Accumulation/Distribution Line in the 1970s as a refinement of On-Balance Volume. His key insight was that OBV's binary approach — adding or subtracting all of a day's volume based solely on whether the close was higher or lower — ignored where within the day's range the close occurred. A stock that closed up by one paisa on heavy volume should not receive the same bullish weight as one that closed near the day's high. The A/D Line corrected this by introducing the Money Flow Multiplier, which scaled volume contribution by the position of the close within the range.
The formula involved three steps: Money Flow Multiplier (MFM) = [(Close − Low) − (High − Close)] ÷ (High − Low); Money Flow Volume (MFV) = MFM × Period Volume; A/D Line = Previous A/D Line + Current MFV. When price closed in the upper half of the daily range, MFM was positive; when in the lower half, negative. A close exactly at the midpoint produced an MFM of zero, adding nothing to the cumulative A/D value regardless of volume — a meaningful distinction from OBV.
In Indian equity markets, the A/D Line was used extensively on daily and weekly charts of benchmark indices and sector leaders. Analysts tracking Nifty Midcap 100 and Nifty Smallcap 250 components found the A/D Line useful in identifying stocks where the pattern of daily closes within the range suggested systematic institutional accumulation. A stock whose A/D Line climbed steadily over weeks while its price made a series of lower highs and higher lows within a consolidation pattern attracted attention as a potential coiled setup.
A classic divergence setup using the A/D Line involved comparing it to price during distribution phases of market cycles. In the later stages of several intermediate rallies in Indian equities observed through 2022–2024, certain large-cap indices continued printing marginal new highs while their A/D Lines diverged downward — signalling that the advances were being driven by diminishing breadth, with stocks closing progressively toward the lower portion of their daily ranges even on the days they closed up. Such observations were one of several inputs into broader market breadth analysis.
The A/D Line was most interpretable as a confirmation tool rather than a standalone signal generator. Practitioners combined it with price trend analysis, sector rotation frameworks, and other volume indicators such as the Chaikin Money Flow oscillator (which was itself derived from the A/D Line logic) to build a more complete picture of underlying market participation.