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Stock Markets July 9, 2026 10:36 AM

Semiconductor and Biotech Names Drive Big Market-Cap Moves on Thursday

Micron, AMD and a cohort of chipmakers post strong gains while a small-cap offering pushes one stock sharply lower

By Jordan Park
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Stocks across market-cap tiers moved sharply on Thursday as semiconductor companies accounted for many of the largest advances and select biotech and small-cap names also produced outsized percentage changes. Micron and AMD were among the notable winners in the mega-cap cohort, while Gloo Holdings fell after pricing a public offering.

Semiconductor and Biotech Names Drive Big Market-Cap Moves on Thursday
MU AMD LRCX ARM INTC
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Key Points

  • Semiconductor-related names including Micron, AMD, Lam Research, Arm and Marvell posted notable gains across mega-cap and large-cap groups, highlighting strength in the chip sector.
  • Biotech and small-cap stocks displayed pronounced volatility, with BridgeBio, Alnylam and First Tracks Biotherapeutics among the top percentage gainers.
  • A corporate financing event - Gloo Holdings pricing a 7 million-share offering at $3.25 each - corresponded with a large single-session decline for that small-cap stock.

Thursday's trading session produced meaningful share-price swings across companies of varying sizes, with semiconductor-related stocks among the brightest performers and a small-cap equity experiencing a steep drop tied to a financing event.

Mega-cap performers

  • Micron Technology (MU) climbed 7.03% after plans for a $3 billion U.S. semiconductor supply chain investment were disclosed.
  • Advanced Micro Devices (AMD) rose 7.21% following the initiation of coverage at Market Perform by William Blair, which cited AI-related growth as a factor.
  • Lam Research Corp (LRCX) advanced 7.42%.
  • Arm (ARM) led the list with an 11.39% gain.
  • Intel Corp (INTC) increased 2.56%.
  • SanDisk Corp-Exch (SNDK) was up 6.38%.
  • Marvell Technology Group Ltd (MRVL) added 5.65%.

Large-cap movers

  • BridgeBio Pharma Inc (BBIO) jumped 15.87%.
  • Alnylam Pharmaceuticals (ALNY) gained 11.29%.
  • Nanometrics Incor (ONTO) climbed 10.98%.
  • Lumentum Holdings Inc (LITE) rose 10.16%.
  • Corning Inc (GLW) was higher by 7.38%.
  • Entegris Inc. (ENTG) added 7.54%.

Mid-cap movers

  • Allegro Microsystems Inc (ALGM) increased 9.87%.
  • 10X Genomics Inc (TXG) climbed 11.42%.
  • Cohu (COHU) rose 9.47% after Baird initiated coverage with an outperform rating.

Small-cap moves

  • First Tracks Biotherapeutics (TRAX) surged 41.98%.
  • AMDL (AMDL) was up 15.23%.
  • MVLL (MVLL) gained 11.26%.
  • Bull Horns (ZSQR) increased 12.43%.
  • Gloo Holdings Ltd (GLOO) declined 20.6% after pricing a public offering of 7 million shares at $3.25 each.

These moves reflect a session in which chip makers and related equipment suppliers were particularly strong across market-cap classifications, while financing activity drove pronounced weakness in at least one small-cap name.

Market participants monitored analyst actions and corporate financing decisions as proximate drivers of individual stock behavior, with coverage initiations and capital-raising events explicitly linked to share-price changes in several cases.

Methodology note

The items above summarize the most substantial percentage changes called out for the trading day, grouped by market-cap strata: mega-caps ($200 billion or higher), large-caps ($10 billion to $200 billion), mid-caps ($2 billion to $10 billion) and small-caps ($300 million to $2 billion).

Risks

  • Financing activity can depress share prices in the near term; Gloo Holdings fell 20.6% after pricing a public offering of 7 million shares at $3.25 each - impacting small-cap investors and the small-cap sector.
  • Analyst coverage changes can alter market perception and cause notable short-term moves, as seen with AMD after William Blair initiated coverage at Market Perform and with Cohu after Baird initiated coverage with an outperform rating - affecting semiconductor and equipment names.
  • High single-day percentage swings across multiple tiers indicate elevated short-term volatility for investors, particularly in semiconductor and biotech segments.

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