Advance-Decline Ratio

The Advance-Decline (A/D) Ratio is a market breadth indicator that calculates the ratio of the number of stocks advancing in price to the number of stocks declining in price for a given period. It tells you if the *entire market* is moving in the same direction, or if a major index (like the Nifty 50 or S&P 500) is being carried by just a few "heavyweight" stocks.

• Trend Confirmation: If an index makes a new high and the A/D ratio is also strong, the trend is supported by broad participation and is likely to continue.
• Identifying Divergence: This is the most powerful signal. If the index hits a new high, but the A/D ratio is falling (fewer stocks are participating), it is a sign of a "weak" trend that is likely to reverse soon.
• Market Turning Points: A sudden, massive shift in the A/D ratio can often signal the beginning of a new market cycle before it is visible on the main index charts.

Never trust a market move that lacks participation. If the index is surging but the A/D ratio is neutral or declining, stay cautious—you are looking at an "overextended" move that is vulnerable to a sharp pullback.