Story
Semiconductor Stocks Tumble, with Lam Research and Palantir Leading Declines

Summary
Shares of semiconductor equipment maker Lam Research and data analytics firm Palantir Technologies fell sharply on Tuesday, part of a broader sell-off in the technology sector driven by weak corporate guidance.
Several major technology stocks, including Lam Research (LRCX) and Palantir Technologies (PLTR), experienced significant declines in Tuesday trading. The sell-off was particularly pronounced in the semiconductor sector, with multiple large-cap companies falling after issuing disappointing financial forecasts.
Mega-Cap Tech Stocks Under Pressure
Some of the market's largest companies by valuation saw notable drops, according to market data from Tuesday. The declines among mega-cap stocks were led by key players in the semiconductor and technology industries.
- Lam Research Corp (LRCX): -10.53%
- Palantir Technologies Inc (PLTR): -9.59%
- Applied Materials Inc (AMAT): -8.78%
- Intel Corp (INTC): -7.95%
These moves suggest broad investor concern within the high-valuation tech space, particularly for companies exposed to the chip manufacturing cycle.
Weak Guidance Drives Large-Cap Sell-Off
AdIn the large-cap segment, forward-looking guidance was a primary catalyst for several of the day's biggest moves. Companies that beat recent earnings expectations were still punished by investors for forecasting weaker-than-anticipated future performance.
Corning Inc. (GLW) shares tumbled -19.42% following weak third-quarter guidance. Similarly, Amkor Technology (AMKR) fell -24.4% on soft Q3 revenue guidance, and Sanmina-SCI Corp (SANM) dropped -20.51% after its Q4 revenue outlook missed expectations, according to Investing.com.
Mixed Fortunes in Mid and Small Caps
Performance among mid- and small-cap stocks was more varied, with company-specific news creating significant winners and losers. Opko Health (OPK) was a standout gainer, surging +32.26%, while Kiniksa Pharmaceuticals (KNSA) rose +22.37% after raising its guidance.
On the other end, Replimune Group (REPL) was one of the day's biggest decliners, falling -32.04%. The divergent performance highlights a market where investors are closely scrutinizing individual company fundamentals and outlooks.
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