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The Accumulation/Distribution indicator is a volume-based technical analysis tool that measures whether buying pressure or selling pressure is dominant in a security over time. It was developed by analyst Marc Chaikin and tracks the cumulative flow of money into and out of a stock by combining price and volume data. Traders use it to confirm price trends and spot divergences that may signal a reversal before price actually changes direction.
The Accumulation/Distribution indicator operates on the premise that the number of shares traded relative to price movement reveals the true intentions of market participants. If a stock closes near its daily high with heavy volume, buyers are in control. If it closes near the low with heavy volume, sellers dominate. The Accumulation/Distribution indicator captures this balance continuously and plots it as a running line.
Think of it like a scorecard tracking which team is winning each trading session, weighted by how many players showed up to play.
The calculation involves three steps performed for each trading period:
When the Accumulation/Distribution line trends upward, buyers are consistently closing prices near the high end of each day's range. That reflects accumulation: buyers are willing to step in aggressively. A falling Accumulation/Distribution line indicates distribution, where sellers are consistently pushing closing prices toward the low end of the daily range.
A rising Accumulation/Distribution line during a period of range-bound prices is an early signal that buyers are building positions ahead of a breakout. A falling Accumulation/Distribution line while prices remain flat warns that sellers are quietly distributing shares before a breakdown.
The Accumulation/Distribution indicator's highest-value use is identifying divergences between the indicator's direction and the stock's price movement.
The Accumulation/Distribution indicator has real blind spots. It does not account for price gaps between periods. A stock can open dramatically lower than the prior close, but if it rallies and closes near the high of that new lower range, the Accumulation/Distribution indicator may show accumulation even though the stock has lost significant value.
It also reacts to intraday position, not to the change from the prior close. Two stocks can have identical Accumulation/Distribution readings with completely different price trajectories. Use this indicator alongside other tools, such as moving averages, the Relative Strength Index, or trend line analysis, rather than as a standalone signal.
| Indicator | Developed By | Price Reference Used | Best For |
|---|---|---|---|
| Accumulation/Distribution | Marc Chaikin | Close within day's high-low range | Confirming trends; spotting divergences |
| On Balance Volume (OBV) | Joe Granville | Compares current close to prior close | Simple momentum confirmation |
| Chaikin Money Flow | Marc Chaikin | Close within day's range over a set period | Short-term buying/selling pressure |
| Chaikin Oscillator | Marc Chaikin | Derived from Accumulation/Distribution | Momentum shifts in the A/D line itself |
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