Stock Markets July 28, 2026 10:36 AM

Lam Research, Palantir Lead Broad Declines as Market Movers on Tuesday

Mega-, large-, mid- and small-cap names post sharp intraday moves, with several semiconductor and biotech stocks among the heaviest losers and a handful of winners in mid- and small-cap groups

By Hana Yamamoto
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LRCX PLTR AMAT INTC GEV

Trading on Tuesday produced wide intraday swings across market-cap segments. Major semiconductor names including Lam Research and Applied Materials were among the strongest decliners, while select mid- and small-cap stocks posted double-digit gains. The session featured pronounced negative moves in several large-cap and mid-cap technology and manufacturing names, alongside several notable rebounds among biotech and healthcare-related tickers.

Lam Research, Palantir Lead Broad Declines as Market Movers on Tuesday
LRCX PLTR AMAT INTC GEV
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Key Points

  • Major semiconductor and technology names including Lam Research (LRCX), Palantir (PLTR), Applied Materials (AMAT) and Intel (INTC) recorded steep intraday declines.
  • A subset of mid- and small-cap healthcare and biotech stocks produced double-digit gains, led by Kiniksa (KNSA) and Opko Health (OPK).
  • Large-cap guidance misses and mixed earnings/guidance outcomes contributed to substantial moves in manufacturing and technology-related names.

Summary: Tuesday's session saw outsized percentage moves across market-cap brackets, with heavy losses concentrated among semiconductor and industrial names and isolated gains in some mid- and small-cap healthcare and biotech stocks. The pattern reflects a day of earnings and guidance reactions alongside other intraday catalysts reflected in the price moves reported below.

Mega-Cap Movers ($200 billion USD or higher)

  • Lam Research Corp (LRCX): -10.53%
  • Palantir Technologies Inc (PLTR): -9.59%
  • Applied Matls Inc (AMAT): -8.78%
  • Intel Corp (INTC): -7.95%
  • GE Vernova LLC (GEV): -7.57%

Large-Cap Stock Movers ($10-$200 billion USD)

  • Amkor Technology (AMKR); Amkor Technology stock edges lower on soft Q3 revenue guidance despite Q2 beat: -24.4%
  • Sanmina-SCI Corp (SANM); Sanmina shares fall 5% on Q4 revenue guidance miss despite beat and raise quarter: -20.51%
  • Corning Inc (GLW); Corning shares tumble on weak third-quarter guidance: -19.42%
  • SanDisk Corp-Exch (SNDK): -14.8%
  • Lumentum Holdings Inc (LITE): -13.88%
  • Coherent (COHR): -15.23%
  • Quintis Trl Hlgs (IQV): +12.56%
  • FG Merger II (BXBL): -7.87%

Mid-Cap Stock Movers ($2-$10 billion USD)

  • Kiniksa Pharmaceuticals Ltd (KNSA); Kiniksa Pharmaceuticals stock rises 2% on raised guidance, revenue beat: +22.37%
  • Repligen Corp (RGEN); Repligen beats estimates but shares dip on guidance concerns: +12.83%
  • Commvault System (CVLT); Commvault stock falls 3% despite beating estimates on guidance concerns: -19.12%
  • AXT Inc (AXTI): -15.37%
  • TKB Critical Tech 1 (SHAZ): -13.88%

Small-Cap Stock Movers ($300 million - $2 billion USD)

  • Replimune Group Inc (REPL): -32.04%
  • Opko Health (OPK): +32.26%
  • TECO Energy Inc-Exch (TE): -20.51%
  • Prelude Therapeutics Inc (PRLD): +18.77%
  • RAM (RAM): -1.77%

The session also produced a set of alternative intraday prints that were recorded alongside the primary mover list. Those prints included slightly different percentage snapshots for a number of names, as shown below.

INTC-6.31%GLW-18.09%AMAT-7.64%SNDK-12.38%LRCX-8.64%AMKR-21.69%AXTI-11.84%COHR-12.31%RGEN+14.61%SANM-19.54%OPK+33.06%CVLT-19.47%IQV+12.45%LITE-10.83%KNSA+23.76%REPL-30.48%TE-18.71%PLTR-8.09%PRLD+20.82%SHAZ-12.73%GEV-6.03%BXBL-9.9%RAM-16.4%IntelFollowAnalyze INTCIncluded in our AI-picked strategies·Review strategies85.89▼-5.78(-6.31%)Real-time Data·10:52:01·USD1D1W1M6M1Y5YMaxCreated with Highcharts 11.4.816:0018:0028/07808590

What this reflects - The numbers above show a market day with concentrated losses among several semiconductor, materials and industrial names, while certain biotech and healthcare-related names posted notable gains. The range of moves spans large-cap technology names down to early-stage therapeutics and small-cap energy names.

Closing note - The intraday list captures headline percentage changes and selected company notes on guidance and earnings beats where explicitly reported. The market reaction varied by company and market-cap tier, producing both sharp declines and isolated double-digit gains within the same session.

Risks

  • Guidance-driven volatility - Several companies listed experienced large moves tied to guidance or revenue outlooks (for example, Amkor Technology and Sanmina), indicating ongoing sensitivity in manufacturing and supply chain-exposed sectors.
  • Earnings and outlook mismatches - Some stocks that beat near-term estimates still fell on guidance concerns, highlighting risk to stocks from forward-looking management statements across technology and software-related firms.
  • Concentration of declines in cyclical and semiconductor names - The heavy losses among semiconductor and industrial names suggest sector-specific downside risk that can amplify overall market volatility.

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