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Market Breadth: The Data Behind Oversold and Overbought Markets #trading

Market breadth provides a deeper look at what’s really happening beneath the surface of the stock market.

In this video, I explain market breadth, how I measure it using AT50 (the percentage of stocks trading above their 50-day moving averages), and why breadth data effectively describes oversold and overbought market conditions.

Rather than focusing only on index prices like the S&P 500, market breadth looks at participation; that is, how many individual stocks are actually involved in a move higher or lower. This perspective helps explain why some market rallies are fragile, how selloffs create opportunity, and why context matters when interpreting market extremes.

This discussion is valuable for both short-term traders and long-term investors. You will learn:
What market breadth is and how it differs from price-only analysis
How AT50 (MMFI on TradingView) measures stock market participation
Why oversold and overbought breadth conditions matter
How the duration of breadth extremes shape S&P 500 performance
Why market breadth is useful for both short-term traders and long-term investors
The data behind historical oversold and overbought periods

I also walk through research showing how the S&P 500 has historically performed during extended oversold and overbought breadth conditions, highlighting why market breadth is best used as a probabilistic, context-driven tool, not a mechanical trading signal.

🤑 For more details see "How AT50 Market Breadth Extremes Shape S&P 500 Performance" at https://drduru.com/onetwentytwo/2026/...

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Disclaimer

The contents of this video do not constitute advice and should not be regarded as a recommendation to buy, sell or otherwise deal with any particular investment. The opinions expressed here are Dr. Duru’s alone and do not represent any former or current employer, customer, or partner unless otherwise stated. Any actions taken as a result of information presented here are done at the reader’s risk. Dr. Duru assumes no liability for the outcome of these actions. At any time and without notice, Dr. Duru may buy, sell, or otherwise dispose of trades and investments mentioned in this or any other video or related blogs. Past performance is no guarantee of future results.

#stocks #technicalanalysis #stockmarket #AT50 #SP500 #marketbreadth