What is the threshold for a distribution day?

A close down 0.2 percent or more on a major index, on total volume higher than the previous session. The threshold has been adjusted slightly over the decades; 0.2 percent is the current IBD rule. Some practitioners use 0.25 percent.

When does a distribution day expire?

After 25 trading sessions, or sooner if the index closes five percent or more above the distribution day's close. The second rule exists because a strong rally shows the selling was absorbed; a day that has been left five percent behind is no longer a threat.

Does a distribution day count on both indexes?

Each index keeps its own count. A day where the S&P 500 fell 0.3 percent on higher volume and the Nasdaq rose is a distribution day for the S&P only. Watch both; the Nasdaq often shows distribution first because it holds the leaders.

Are distribution days the opposite of follow-through days?

In spirit, yes. A follow-through day is a strong up day on rising volume that opens an uptrend. A distribution day is a down day on rising volume that, in a cluster, closes one. Both read institutional behavior through the same lens: price change against the prior day's volume.

How does a new high affect the count?

A fresh high in the index resets the picture, because the selling those days recorded was absorbed. Some traders drop the whole count on a decisive new high. Others keep counting and let each day retire on its own twenty five day clock.

Why do distribution days arrive in clusters?

Large positions take days to sell without moving the price, so a single decision shows up as several heavy down sessions inside a few weeks. That is the pattern the count is designed to catch, and it is why three days in one week say more than three spread over a month.

When does the count argue for less exposure?

Around five in four or five weeks, and sooner when the leading stocks are breaking down at the same time. The count is a warning rather than an exit order.

Is a heavy gap down a distribution day?

If the index closes down at least two tenths of a percent on higher volume than the day before, yes. The shape of the session makes no difference to the count.

What happens when the count is high and the market keeps rising?

It happens, and it is the main weakness of the tool. Heavy volume down days can appear inside a strong uptrend, especially around expirations when volume is inflated for reasons unrelated to selling. A high count with leadership still working is a reason to watch closely rather than to sell.

Can I count distribution days on a single stock?

You can, and the same logic applies. The reading is noisier, because one institution rebalancing can produce several heavy down days in a mid-cap without saying anything about the company. The count was built for indexes because they average that noise out.

What is a distribution day, and how many is too many?

By Daniel, The Philosopher Investor · updated September 18, 2026

A distribution day is a session where a major index closes down, by 0.2 percent or more, on volume higher than the previous day. It shows large investors selling into the market. One means little. Five or six within four or five weeks has historically marked the point where uptrends fail, which is why the count is watched.

Why does a down day on higher volume matter?

Prices fall on light volume when buyers step back; they fall on heavy volume when holders sell. The second is what a distribution day captures. Institutions cannot exit a position in a day, so they sell into strength over weeks, and the tell is the index closing lower on more shares than the day before. A single day can be noise. A pattern of them is a fund manager reducing exposure.

The 0.2 percent threshold exists to exclude flat days where volume happened to be higher. The volume comparison is to the prior session, never to the average, so a distribution day can occur on a below-average volume day if the day before was quieter still.

How do you count them?

Keep a rolling window of about 25 trading sessions, roughly five weeks, and count the distribution days inside it for each major index separately. Investor's Business Daily runs the count on the S&P 500 and the Nasdaq. When either reaches five or six the market outlook shifts to under pressure. Any higher and it is treated as a correction.

A day drops out of the count in two ways. It ages out after 25 sessions. Or the index rises five percent or more above that day's close, which means the selling was absorbed and no longer matters. This is why a strong rally clears the count quickly.

What is stalling?

A variant that catches selling into strength without a down close. The index rises slightly, less than about 0.1 percent, on higher volume than the prior day, after a run of gains, and closes in the lower half of its range. Heavy volume that produces no progress means supply is meeting demand at the highs. IBD counts stalling days alongside distribution days, and they often come first.

Stalling days are the subtle version. A chart that shows three up days each closing lower in its range on rising volume is a chart where somebody is selling into every rally. That is distribution with better manners.

How many is too many?

Five or six inside the window has been the threshold since O'Neil's original work, and it has held up. Uptrends can absorb two or three. Once the count reaches five, the historical record shows a large share of uptrends topping within weeks. Not all, and the count has produced false alarms in long bull markets where volume patterns were distorted.

Read the count with the leaders. A high count while leading stocks hold their moving averages is a warning. A high count while the leaders break down, on their own heavy volume, is the top being made in front of you.

What does the count not tell you?

How far the correction will go, or how long. A cluster of distribution days precedes both five percent pullbacks and forty percent bear markets. The count is a sign that the uptrend is under pressure and that new buys are risky. It is a defensive tool: raise cash, tighten stops, stop adding. It is not a forecast of the depth of what follows.

It also lags on gap-driven markets. A single news shock that takes the index down four percent in a day registers as one distribution day, the same as a quiet 0.3 percent decline. The count is best on the slow-turning tops it was built for, and weakest on the sudden ones.

Common questions

What is the threshold for a distribution day?: A close down 0.2 percent or more on a major index, on total volume higher than the previous session. The threshold has been adjusted slightly over the decades; 0.2 percent is the current IBD rule. Some practitioners use 0.25 percent.
When does a distribution day expire?: After 25 trading sessions, or sooner if the index closes five percent or more above the distribution day's close. The second rule exists because a strong rally shows the selling was absorbed; a day that has been left five percent behind is no longer a threat.
Does a distribution day count on both indexes?: Each index keeps its own count. A day where the S&P 500 fell 0.3 percent on higher volume and the Nasdaq rose is a distribution day for the S&P only. Watch both; the Nasdaq often shows distribution first because it holds the leaders.
Are distribution days the opposite of follow-through days?: In spirit, yes. A follow-through day is a strong up day on rising volume that opens an uptrend. A distribution day is a down day on rising volume that, in a cluster, closes one. Both read institutional behavior through the same lens: price change against the prior day's volume.
How does a new high affect the count?: A fresh high in the index resets the picture, because the selling those days recorded was absorbed. Some traders drop the whole count on a decisive new high. Others keep counting and let each day retire on its own twenty five day clock.
Why do distribution days arrive in clusters?: Large positions take days to sell without moving the price, so a single decision shows up as several heavy down sessions inside a few weeks. That is the pattern the count is designed to catch, and it is why three days in one week say more than three spread over a month.
When does the count argue for less exposure?: Around five in four or five weeks, and sooner when the leading stocks are breaking down at the same time. The count is a warning rather than an exit order.
Is a heavy gap down a distribution day?: If the index closes down at least two tenths of a percent on higher volume than the day before, yes. The shape of the session makes no difference to the count.
What happens when the count is high and the market keeps rising?: It happens, and it is the main weakness of the tool. Heavy volume down days can appear inside a strong uptrend, especially around expirations when volume is inflated for reasons unrelated to selling. A high count with leadership still working is a reason to watch closely rather than to sell.
Can I count distribution days on a single stock?: You can, and the same logic applies. The reading is noisier, because one institution rebalancing can produce several heavy down days in a mid-cap without saying anything about the company. The count was built for indexes because they average that noise out.

Primary sources

NYSE market data · www.nyse.com
Nasdaq market activity and volume · www.nasdaq.com
FRED, historical index series · fred.stlouisfed.org

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