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Accumulation Distribution Indicator

OVERVIEW

The Accumulation Distribution Indicator (A/D) is a volume-based technical analysis tool that evaluates whether institutional capital is flowing into or out of a stock. It uses price location and volume to determine the degree of buying or selling pressure.

Note

The A/D line rises when a stock closes near its session high on heavy volume (accumulation) and falls when it closes near its session low on heavy volume (distribution).

The indicator identifies divergences between price and volume that precede major reversals, making it a primary tool for evaluating trend sustainability before committing to a position.

HOW IT WORKS

The A/D indicator calculates a Money Flow Multiplier (MFM) using the high, low, and closing prices, then multiplies that value by the period's volume to produce the Money Flow Volume (MFV). A running cumulative total forms the A/D line.

Formulas

Step Formula
Money Flow Multiplier (MFM) ((Close - Low) - (High - Close)) / (High - Low)
Money Flow Volume (MFV) MFM × Volume for the Period
Accumulation Distribution Line Previous A/D Value + Current MFV

Note

If the high and low are identical, the formula defaults to 0 to avoid division by zero. An MFM of 1 means price closed at the session high; an MFM of -1 means it closed at the session low.

Worked Example

The following session data is used for AAPL:

Metric Value
High $195.00
Low $190.00
Close $193.50
Volume 50,000,000

Step-by-step calculation:

  1. MFM = (($193.50 - $190.00) - ($195.00 - $193.50)) / ($195.00 - $190.00)
  2. MFM = ($3.50 - $1.50) / $5.00 = 0.40
  3. MFV = 0.40 × 50,000,000 = 20,000,000

The A/D line adds 20,000,000 to its running total.

Tip

If AAPL had closed at $194.80 instead, the MFM jumps to 0.92 and the MFV becomes 46,000,000 — showing intense accumulation despite a smaller absolute price move. Close location within the range matters more than the size of the move.

HOW TO USE

Confirming Trend Sustainability

Use the A/D line to validate whether a price trend has volume backing before sizing into a position.

Price Action A/D Behaviour Signal
New price high A/D also makes new high Trend confirmed — accumulation backing the move
New price high A/D fails to make new high Bearish divergence — rally lacks volume support
New price low A/D also makes new low Trend confirmed — distribution continuing
New price low A/D flattens or rises Bullish divergence — selling pressure exhausted

Spotting Divergences

Swing traders rely on A/D divergences to time entries near market bottoms and exits near distribution tops.

  • Bearish divergence — price reaches a new high but the A/D line does not; the advance is unsupported by institutional volume.
  • Bullish divergence — price drops to a new low but the A/D line holds flat or climbs; sellers are losing conviction.

Tip

Pair A/D divergence signals with a moving average crossover or a support/resistance level to confirm entry timing before executing.

LIMITATIONS

Limitation Detail
Ignores gaps A stock that gaps up but closes slightly lower within the day's range produces a negative MFM, generating a false distribution signal even though the stock gained overall.
Treats all volume equally Heavy retail volume without institutional backing skews the A/D line and overstates accumulation or distribution.
No standalone use Must be paired with price action and moving averages to filter out gap-driven distortions.

Note

The A/D indicator is best used as a confirmation tool, not a primary entry signal. Always cross-reference with price structure before acting on divergences.