Stock Markets August 5, 2026 10:35 AM

Market movers: Amgen lifts while chip and aviation names slide in Wednesday trading

A mix of earnings beats, guidance revisions and guidance-related concerns sent large swings across mega-, large- and mid-cap stocks

By Jordan Park
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Wednesday’s session produced a wide range of price moves across market capitalizations. Amgen rose after beating second-quarter estimates and raising guidance, while chipmaker Advanced Micro Devices and aerospace name SpaceX were among the larger decliners. Several companies reported earnings beats that were met with positive share reactions, while others saw sharp drops tied to weak revenue, disappointing guidance or mixed outlooks.

Market movers: Amgen lifts while chip and aviation names slide in Wednesday trading
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Key Points

  • Amgen beat Q2 estimates on strong drug sales and raised its guidance, prompting a mid-single-digit share gain.
  • Several companies posted earnings beats and upward guidance that were met with positive price reactions, including Charles River, Dynatrace, Materion and Shopify.
  • A number of companies experienced sharp declines after weak revenue, disappointing guidance or mixed outlooks, notably Insulet, SolarEdge, Teradata, Extreme Networks and Chemours.

Market overview

Trading on Wednesday featured pronounced volatility across a spectrum of companies, from mega-cap names to small-cap listings. A handful of stocks advanced after reporting stronger-than-expected results or raising guidance, while others slid sharply following weak revenue reports, soft outlooks or investor concerns about guidance.


Mega-cap movers

  • SpaceX (SPCX) -7.27%: listed among the larger decliners in the session.
  • Advanced Micro Devices (AMD) -6.7%: a notable loser among technology and semiconductor names.
  • Amgen Inc (AMGN) +5.82%: Amgen beat second-quarter estimates on strong drug sales and raised its guidance, prompting a positive share reaction.

Large-cap movers

  • Insulet Corp (PODD) -17.69%: one of the steeper drops in the large-cap grouping.
  • Regal Beloit Corp (RRX) -13.02%: shares tumbled on weak revenue and a soft guidance signal.
  • Ritchie Bros. Auctioneers (RBA) -13.87%: a substantial decline for the auctioneer.
  • CDW Corp (CDW) -12.4%: shares fell despite the company beating second-quarter estimates.
  • Charles River Laboratories International (CRL) +11.65%: the stock rose after a Q2 beat and a raised guidance.
  • Dynatrace Holdings LLC (DT) +14.69%: shares climbed following an earnings beat and stronger guidance.
  • Shopify Inc (SHOP) +17.71%: a strong advance among software and e-commerce related names.

Mid-cap movers

  • Materion Corp (MTRN) +24.88%: shares leapt after an earnings beat and an increased outlook.
  • Latham Group (SWIM) +23.6%: another sizable mid-cap gainer.
  • Zeta Global Holdings (ZETA) +15.13%: the stock moved higher despite guidance concerns referenced in commentary.
  • Retrophin I (TVTX) +17.17%: a double-digit advance for the smaller biotech-related listing.
  • SolarEdge Technologies Inc (SEDG) -22.12%: one of the sharper losses in the mid-cap cohort.
  • Teradata (TDC) -19.86%: shares tumbled on weak third-quarter guidance.
  • Extreme Networks (EXTR) -19.16%: the stock fell after management issued mixed guidance despite a Q4 beat.
  • Chemours Co (CC) -16.79%: a significant decline for the chemicals company.
  • Lucid Group Inc (LCID) -13.88%: shares fell on weak Q2 revenue and a wider-than-expected loss.

Small-cap and miscellaneous movers

  • AMGN +6.33% (small-cap list reference): reflected gains in Amgen in another summary listing.
  • EXTR -18.55% (small-cap list reference): corroborating Extreme Networks' declines.
  • TDC -19.92% (small-cap list reference): matching the weakness noted for Teradata.
  • AMD -6.76% (small-cap list reference): reiteration of the chipmaker's decline.
  • PODD -17.52% (small-cap list reference): consistent with Insulet's drop in other listings.
  • CRL +12.32% (small-cap list reference): another listing showing Charles River's gain.
  • RRX -13.65% (small-cap list reference): consistent with the weak revenue-driven move.
  • MTRN +24.55% (small-cap list reference): reflecting Materion's positive reaction.
  • VPG -23.64%: a pronounced decline for Vishay Precision Group.
  • BLMN +39.63%: Bloomin' Brands surged after an earnings beat and raised guidance.
  • RBA -14.18% (small-cap list reference): another listing capturing Ritchie Bros. weakness.
  • APPS +42.27%: Mandalay Digital Group Inc posted a large advance.
  • CDW -12.7% (small-cap list reference): reiterating CDW's pullback despite a beat.
  • TVTX +16.97% (small-cap list reference): matching the mid-cap listing for Retrophin I.
  • LMB -29.89%: Latham Group showed a sharp decline in one of the summary lines.
  • SEDG -22.79% (small-cap list reference): reiterating SolarEdge's steep loss.
  • SHOP +17.56% (small-cap list reference): confirming Shopify's strong rise in another summary line.
  • CC -16.79% (small-cap list reference): echoing Chemours' decline.
  • DT +14.59% (small-cap list reference): reinforcing Dynatrace's positive move.
  • LCID -14.14% (small-cap list reference): reflecting Lucid's fall in another summary entry.
  • TBLA -23.82%: Taboola shares fell on an earnings miss and weak guidance.
  • SWIM +23.86% (small-cap list reference): reinforcing Latham Group's gain.
  • ZETA +13.56% (small-cap list reference): another positive reference for Zeta Global.
  • SPCX -8.45% (small-cap list reference): additional listing noting SpaceX weakness.

Data notes

The session's movers include companies that reported earnings beats and raised guidance, companies that beat but still saw shares fall, and companies that reported weak revenue or provided softer guidance. Some tickers appear multiple times across the summary lists with closely aligned percentage moves that reflect separate summary lines in the source material.


Summary takeaway

Wednesday’s tape was characterized by divergent investor reactions: pharmaceutical and certain service names rallied after positive results and guidance, while technology, industrial and energy-related names saw notable declines tied to weak revenue, mixed guidance and other company-specific updates.

Risks

  • Companies that issued soft or weak guidance experienced steep share declines, highlighting the risk that forward-looking commentary can offset positive quarterly results - sectors impacted include industrials, software and renewable energy.
  • Some firms saw shares fall despite beating estimates, indicating that investor focus on guidance or other qualitative factors can increase volatility - sectors impacted include technology and enterprise services.

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