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Stock Markets January 28, 2026

Market Caps See Wide Moves Midweek as Intel, Seagate Lead Gains and Amphenol Slides

Mega-, large-, mid- and small-cap names post notable swings on corporate news, analyst actions and regulatory updates

By Derek Hwang APH INTC MU UNH
Market Caps See Wide Moves Midweek as Intel, Seagate Lead Gains and Amphenol Slides
APH INTC MU UNH

Equity markets experienced notable intraday volatility on Wednesday, with a mix of strong rallies and steep declines across market-cap segments. Among the largest moves, Intel and Seagate climbed sharply, while Amphenol posted a double-digit drop. A range of analyst upgrades, coverage initiations and regulatory developments underpinned many of the individual stock moves.

Key Points

  • Major-cap names split between sharp gains and losses, with Intel and Seagate among the largest winners and Amphenol posting a steep decline.
  • Analyst upgrades, initiations of coverage and regulatory updates drove notable moves across large- and mid-cap stocks.
  • Small-cap volatility was pronounced, with preliminary results, clinical regulatory actions and rating downgrades producing some of the day's largest percentage moves.

Trading on Wednesday produced pronounced divergences across individual equities, with some names rallying strongly and others falling back on news flow including analyst actions and regulatory updates.

Below is a categorized rundown of some of the day’s most significant market-cap stock movers, grouped by mega-cap, large-cap, mid-cap and small-cap classifications. Percent moves and cited catalysts are reported as released in market updates.

Mega-Cap Movers

  • Amphenol Corp (APH); -13.0%
  • Intel Corp (INTC); NVIDIA Feynman Architecture Generation will reportedly seek Intel cooperation; +8.92%
  • Micron Tech (MU); +3.96%
  • United Health Group (UNH); +2.5%
  • Alibaba-exch (BABA); +1.26%
  • Eli Lilly And Co (LLY); -2.33%

The mega-cap list shows both the day’s strongest percentage gainers and largest declines, reflecting a mix of sector-specific updates and broader market sentiment.

Large-Cap Stock Movers

  • Seagate Technology (STX); +16.74%
  • Nextracker (NXT); KeyBanc upgrades Nextpower stock to Overweight on growth outlook; +15.86%
  • Texas Instru (TXN); +7.77%
  • F5 Networks Inc (FFIV); +8.15%
  • Circle Internet Group Inc (CRCL); Mizuho upgrades Circle Internet Group stock rating to Neutral on Polymarket growth; +5.37%
  • Bloom Energy Corp (BE); Barclays initiates coverage on Bloom Energy stock with Equalweight rating; +4.59%
  • AltC Acquisition (OKLO); Texas Capital Securities initiates Buy rating on Oklo stock with $138 target; +5.15%
  • Figure Technology Solutions Ltd (FIGR); +6.61%
  • Textron Inc (TXT); Textron reports in-line Q4 results, guides 2026 below expectations; -8.21%
  • Albemarle (ALB); -7.46%

Large-cap momentum was led by Seagate’s substantial gain, while several names moved on fresh analyst coverage and ratings changes.

Mid-Cap Stock Movers

  • K12 Inc (LRN); Stride surges as second quarter earnings soar past estimates; +20.29%
  • Littelfuse (LFUS); +8.19%
  • Avnet Inc (AVT); +7.97%
  • WIX.COM LTD. (WIX); Wix authorizes $2 billion share and convertible note repurchase program; +7.8%
  • Glaukos Corp (GKOS); FDA approves repeat treatment protocol for Glaukos’ iDose TR; +7.02%
  • New Oriental Education & Tech (EDU); New Oriental Education shares rise as earnings soar on strong revenue growth; +4.98%
  • Prosperity Bancshares Inc (PB); -8.53%
  • Vf Corp (VFC); -8.41%
  • Badger Meter Inc (BMI); -9.41%
  • Apellis Pharma (APLS); +5.71%

Among mid-caps, earnings beats and corporate actions supported advances in several stocks, while other names retreated on mixed results or investor re-pricing.

Small-Cap Stock Movers

  • Venu Holding (VENU); Venu reports preliminary Q4 results with revenue up to $4.8 million; -26.43%
  • Regenxbio Inc (RGNX); FDA places clinical hold on REGENXBIO gene therapies after tumor case; -17.41%
  • Portfolio Recover (PRAA); Portfolio Recovery Associates stock rating downgraded by Citizens; -14.99%
  • Richtech Robotics (RR); -12.88%
  • Destiny Tech100 (DXYZ); +12.96%
  • Junee (SUPX); +13.44%
  • Stellar Bancorp (STEL); +11.45%
  • Amplify Snack Brands Inc (BETR); +10.17%
  • Kosmos Energy Ltd (KOS); +7.97%
  • Hyperliquid Strategies (PURR); +6.55%

Small-cap action reflected company-specific developments, regulatory decisions and rating changes that drove outsized intraday moves in both directions.

These movements reflect intraday market responses to the individual corporate items and analyst notes cited above. For traders and investors seeking minute-by-minute updates, real-time market services were recommended by market participants during the session.

Risks

  • Regulatory actions affecting biotech and gene therapy firms - as seen with a clinical hold on REGENXBIO therapies - can produce sharp negative moves in affected healthcare names.
  • Company-specific earnings or preliminary financial disclosures may trigger outsized volatility for smaller issuers - illustrated by Venu Holding's reaction to preliminary Q4 revenue figures.
  • Analyst rating changes and coverage initiations can materially influence investor demand for individual stocks, contributing to large intraday moves in large-cap and mid-cap names.

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