Stocks had a great day on the surface. But something alarming occurred not seen since 1999

Despite a strong day for major stock indices, market analysts are concerned by a technical anomaly where more stocks hit 52-week lows than highs. This pattern has historically preceded significant market volatility, last seen before the Dotcom Bubble burst.
Why it matters
This divergence suggests underlying weakness in the broader market, signaling potential risks for investors despite headline gains.
The stock market just posted a banner day by nearly any measure on Monday. The Nasdaq Composite surged 2% to a new record. The broader S&P 500 jumped about 1.5% and now sits less than 1% below a new high.
But traders are buzzing about something unhealthy that occurred under the surface.
More stocks fell to new 52-week lows on Monday than rose to 52-week highs in the index. More specifically, 30 S&P 500 stocks hit new lows, while only seven reached fresh highs.
The last time the index advanced at least 1% to within 1% of a new 52-week high as new lows outnumbered new highs was Dec. 21, 1999, a few months before the Dotcom Bubble top. That's according to Jason Goepfert, who founded SentimenTrader and now serves as an adviser at NextGen News.
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