Advance-Decline Line
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Advance-Decline Line
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The Advance-Decline Line (A/D Line) is a tool used to understand how strong or weak a market move really is.
Instead of just looking at the index (like Nifty 50), it looks at how many stocks are rising versus falling. This helps answer a simple question: is the whole market moving, or just a few large stocks?
Each day, the difference between advancing stocks and declining stocks is calculated and added to the previous total, creating a running line.
In simple terms, it shows whether most stocks are participating in a market trend or not.
Formula:
A/D Line (today) = A/D Line (yesterday) + (Number of rising stocks − Number of falling stocks)
How to read it:
• If the A/D Line rises along with the index, the move is broad and healthy
• If the index rises but the A/D Line falls, fewer stocks are participating — a sign of weakness
• If the index falls but the A/D Line rises, it may signal hidden strength in the market
In May 2023, the A/D Line for the NSE500 started falling even though the Nifty 50 was stable around 18,200.
This showed that many mid-cap and small-cap stocks were already weakening, even though the index did not reflect it. In other words, the rally was being driven by fewer stocks.
Soon after, the Nifty corrected, confirming the early warning given by the A/D Line. Later, when the A/D Line started rising again before the index, it signalled broader buying returning to the market.
market breadth indicator
1929 market crash
Richard Russell
divergences and confirming trends
Definition
The Advance-Decline Line (A/D Line) is a tool used to understand how strong or weak a market move really is.
Instead of just looking at the index (like Nifty 50), it looks at how many stocks are rising versus falling. This helps answer a simple question: is the whole market moving, or just a few large stocks?
Each day, the difference between advancing stocks and declining stocks is calculated and added to the previous total, creating a running line.
In simple terms, it shows whether most stocks are participating in a market trend or not.
Formula:
A/D Line (today) = A/D Line (yesterday) + (Number of rising stocks − Number of falling stocks)
How to read it:
• If the A/D Line rises along with the index, the move is broad and healthy
• If the index rises but the A/D Line falls, fewer stocks are participating — a sign of weakness
• If the index falls but the A/D Line rises, it may signal hidden strength in the market
Case Study
In May 2023, the A/D Line for the NSE500 started falling even though the Nifty 50 was stable around 18,200.
This showed that many mid-cap and small-cap stocks were already weakening, even though the index did not reflect it. In other words, the rally was being driven by fewer stocks.
Soon after, the Nifty corrected, confirming the early warning given by the A/D Line. Later, when the A/D Line started rising again before the index, it signalled broader buying returning to the market.
Historical Reference
market breadth indicator
1929 market crash
Richard Russell
divergences and confirming trends
Illustration
