American Association of Individual Investors

American Association of Individual Investors

Gauging the Strength of Market Trends With the A/D Line

The Advance/Decline line gives context to an index’s movement by looking at how many stocks are going up and how many are going down.

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AAII
Sep 22, 2026
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Featured Tickers:AAPL,NVDA

  • Understand how market breadth reveals participation beyond index performance, showing whether gains or losses are broadly shared by stocks

  • Learn how the Advance/Decline (A/D) line measures market trends, confirms momentum and identifies changes beneath the market’s surface

  • Discover how breadth indicators, divergences and momentum measures can provide additional context for investment decisions

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