U.S. markets on Tuesday displayed broad volatility as a mix of sector-specific news and wider market flows produced notable winners and losers across market-cap categories. Semiconductor and networking names among mega-caps were among the most heavily impacted, while a diverse set of mid- and small-cap companies reported outsized gains and losses.
Mega-cap movers
Stocks with market capitalizations of $200 billion or more posted some of the day’s steepest slides. Marvell Technology Group Ltd (MRVL) was down -10.83%, and Arm (ARM) declined -8.72%. Qualcomm Inc (QCOM) fell -8.26%. Other large technology and semiconductor names were also lower: Dell Inc (DELL) -7.55%, Adv Micro Device (AMD) -6.0%, Intel Corp (INTC) -4.98%, Micron Tech (MU) -5.23%. Data and software names slipped as well, with Palantir Technologies Inc (PLTR) -4.18%, Cisco Sys Inc (CSCO) -3.95% and Palo Alto Netwrk (PANW) -3.91%.
Large-cap movers
Among companies with market capitalizations between $10 billion and $200 billion, recent headlines and sector sentiment pushed several stocks lower. Applied Optoelectronics (AAOI) dropped -15.12% and Coherent (COHR) slid -12.47%. SailPoint Tech (SAIL) fell -12.41%, dMY Technology Group III (IONQ) was down -9.71%, and Super Micro Compu (SMCI) declined -9.09%. Other notable down days included Corning Inc (GLW) -9.02% and Lumentum Holdings Inc (LITE) -9.34%.
Counterbalancing some of those losses, a handful of names in the large-cap bucket rallied: Diamond Eagle Acquisition Corp (DKNG) gained +9.04% and Jm Smucker Co (SJM) climbed +9.48%. Financials saw a strong move as Credicorp Ltd (BAP) rose +10.01%.
Mid-cap movers
In the $2 billion to $10 billion market-cap bracket, activity was dominated by sharp winners and losers. Nuvalent (NUVL) posted the session’s biggest advance, jumping +39.08%. Alignment Healthcare LLC (ALHC) rallied +20.62%, and CECO Environmenta (CECO) advanced +13.63% after updating its 2026 outlook following the Thermon acquisition. On the downside, Uranium Energy Corp (UEC) declined -17.01%, Redwire (RDW) fell -16.48% and Primoris Services (PRIM) slid -15.27% after announcing a management change in its renewables organization. Cree Inc. (WOLF) was down -14.25% as Wolfspeed introduced a new generation of silicon carbide technology, and POET Tech NAQ (POET) dropped -13.23%. CF Acquisition Corp VI (RUMBW) was lower by -7.41%.
Small-cap movers
Smaller capitalization names produced mixed results with substantial intraday dispersion. Select moves included SJM +9.6%, CECO +14.44%, FuelCell Energy (FCEL) +14.58%, BAP +10.52% and PAYO +26.17%. On the negative side, several smaller issuers fell sharply: DBI -19.59%, UL-listed JD-like names JLHL -34.07% and AAOX -25.78%. Additional declines included EH -21.3%, UEC -16.93% and LITX -16.2%.
Consolidated quotes and additional movers
The session saw repeated appearances by many names across market-cap tables. Representative moves cited during the day included INTC -3.59%, DELL -5.94%, CSCO -3.51%, GLW -8.65%, QCOM -7.22%, MRVL -9.02%, MU -4.72% and AMD -4.76%. Mid- and small-cap names with notable moves included WOLF -11.02%, COHR -10.92%, PRIM -15.01%, SMCI -8.25%, DKNG +9.26%, PLTR -3.39% and IONQ -8.94%. Several SPACs and special-purpose issuers were active: RUMBW -7.41%, PAYO +27.43% and others.
Sectors and themes affected
- Semiconductors and hardware: Heavy selling in marquee semiconductor names contributed to the session's declines among mega-caps and large-cap technology firms.
- Health care and biotech: A handful of mid-cap health-care names produced outsized gains, led by Nuvalent and Alignment Healthcare.
- Financials: Credicorp (BAP) was a notable financial services gainer within the large-cap group.
Market context and final note
The trading day featured a broad cross-section of moves driven by company-level news, sector dynamics and likely flow-driven adjustments. The list of movers included familiar mega-cap names as well as SPACs, acquisition vehicles and smaller companies undergoing operational or strategic updates. Intraday volatility produced both double-digit gains and losses across market-cap segments.