U.S. equity trading on Tuesday saw pronounced volatility, with major technology and industrial names among the heaviest decliners and a subset of mid- and small-cap issues posting sizable gains. Company-specific announcements and guidance updates appeared to drive many of the largest moves across market-cap buckets.
Key movers by market-cap category
Mega-Cap Movers ($200B+ Market Cap)
- MongoDB (MDB) - MongoDB stock plunges 20% on weak guidance, despite Q4 earnings, revenue beat: -25.74%
- Micron Technology (MU) - Micron ships 256GB low-power memory samples for AI servers: -8.84%
- Intel Corp (INTC): -6.84%
- GE Vernova LLC (GEV): -7.61%
- Alibaba-exch (BABA) - US Mulls Capping Nvidia H200 Sales At 75,000 Per Chinese Buyer - Bloomberg: -6.33%
- Kla-tencor Corp (KLAC): -6.76%
- Applied Matls Inc (AMAT): -5.93%
- Caterpillar (CAT): -5.78%
- Lam Research Corp (LRCX): -6.36%
- Adv Micro Device (AMD) - US Mulls Capping Nvidia H200 Sales At 75,000 Per Chinese Buyer - Bloomberg: -4.95%
- Oracle Corp (ORCL): -3.87%
Large-Cap Stock Movers ($10B-$200B Market Cap)
- Sea Limited (SE): -23.4%
- Credo Technology Holding (CRDO) - Credo Technology shares tumble 10% despite better-than-expected Q3 results: -18.67%
- Hecla Mining Comp (HL): -16.26%
- AngloGold Ashanti Ltd (AU): -12.79%
- Coeur dAlene Mines Corp (CDE): -13.84%
- Venture Global Inc (VG): +6.46%
- Soc Quimica ADR (SQM): -12.59%
- On Holding (ONON): -12.87%
- Xp Inc (XP): -10.82%
Mid-Cap Stock Movers ($2B-$10B Market Cap)
- Panacea Acquisition (NUVB): -23.46%
- Surgery Partners Inc (SGRY) - Surgery Partners nosedives 25% on weak guidance, Q4 earnings miss: -21.6%
- StoneCo Ltd (STNE): -19.14%
- AXT Inc (AXTI): -19.19%
- Alamo Group Inc (ALG) - Alamo Group posts disappointing Q4 results, shares edge lower: -17.3%
- Mudrick Capital A (HYMC): -17.82%
- Polestar Automotive Holding Plc (PSNY): -15.13%
- Plug Power (PLUG) - Plug Power names Jose Luis Crespo as new CEO: +15.54%
- Kontoor Brands (KTB) - Kontoor Brands beats estimates on strong Helly Hansen addition: +18.17%
- Sportradar (SRAD) - Sportradar reports 17% revenue growth to €1.29 billion in 2025: -13.89%
Small-Cap Stock Movers ($300M-$2B Market Cap)
- j2 Global (ZD) - Ziff Davis to sell Connectivity division to Accenture for $1.2B: +74.16%
- Theravance Biopharma Inc (TBPH) - Theravance to cut costs 60% after drug trial fails primary endpoint: -26.23%
- Imprimis Pharmaceuticals Inc (HROW) - FDA clears Harrow’s Phase 3 trial for post-cataract surgery drug: -26.74%
- Cerus Corp (CERS) - Cerus falls 7% after posting in-line Q4 earnings, revenue beat: -23.91%
- ThredUp (TDUP): -25.55%
- UVIX: +28.67%
- Hexindai (AHG): +13.5%
- ProShares Ultra VIX Short-Term Fut (UVXY): +21.01%
- TimefireVR (RCAT): +5.85%
- Sigma Lithium US (SGML): -15.12%
Across market caps, the session was characterized by sector-specific catalysts and company announcements that translated into outsized moves. Within mega-caps, several semiconductor equipment and chipmakers were lower, while large-cap miners and e-commerce names also posted steep declines. In the mid- and small-cap universes, a mixture of operational updates, executive changes, regulatory developments and clinical-trial-related news pushed individual names sharply in both directions.
Traders and investors assessing exposures may note the breadth of sectors impacted - technology, semiconductors, mining, retail and biotech all registered significant price action during the day. The listed percentage changes reflect the intraday moves reported for each security.
Key points
- Major technology and industrial names led the declines among mega-cap stocks, with MongoDB and Micron notable for their sharp drops.
- Energy, hydrogen and specialty small-caps recorded some of the largest gains, driven by discrete company events and transactions.
- Sectors affected include technology and semiconductors, mining and basic materials, biotech and small-cap specialty finance and services.
Risks and uncertainties
- Guidance changes and earnings surprises can produce abrupt share-price moves across sectors - technology and industrials were particularly affected on this session.
- Company-specific operational outcomes, including clinical-trial results and executive changes, create volatility especially in biotech and mid-/small-cap stocks.
- Regulatory or policy-related reports noted for certain names can influence trading in semiconductors and related equipment suppliers.