Key Highlights

  • The PHLX Semiconductor index rose 5.66% to 10,564.11 on Wednesday, November 11, 2026, its highest close since November 3, with every one of its members finishing higher.
  • Memory and processor makers led: Sandisk gained 13.69%, Arm 12.05%, Micron 11.89%, AMD 7.32% and TSMC's US shares 4.25%.
  • The rally followed CoreWeave's strong third-quarter report, which signalled continued heavy spending on AI infrastructure.
  • iShares Semiconductor ETF (NASDAQ:SOXX) tracked the move as technology became the best performing sector, up 3.23%.

The Catalyst Behind the Move

CoreWeave, one of the largest buyers of AI accelerators, reported Revenue of USD 3.66 billion, raised its 2026 revenue outlook to USD 13.0 billion to USD 13.3 billion and guided Capital spending of USD 37 billion to USD 39 billion. Its shares jumped 24.71%. For chipmakers, the message was that Demand for computing capacity remains strong and is being financed by customer prepayments rather than risky debt. That eased a key worry that had pulled the sector lower in recent weeks. Equipment and test suppliers joined the rally after several Brokers raised their ratings: Teradyne rose 8.30%, FormFactor 11.85% and Corning 7.43%. Taiwan's stock market rose 3.62% overnight, with TSMC's local shares up 4.81%, after the foundry reported October revenue up 59.7% from a year earlier the previous day. The breadth of the move, with no member falling, showed buyers returning across the Supply chain.

Why Memory Led

Memory stocks posted the largest gains because AI servers require large volumes of high-bandwidth memory and storage, and supply has been tight. Micron and Sandisk had fallen during the broader technology correction, so the rebound was sharp when sentiment improved. Arm, whose designs are used in data-center processors as well as phones, also benefited. Nvidia lagged the group, rising 2.87%, after a broker downgrade and continuing governance concerns. The divergence was notable: investors bought AI hardware broadly while staying cautious on the sector's largest name. AMD rose 7.32% and then gained further in extended trading as Nvidia fell, reflecting a view that rivals could benefit from any disruption at the market leader. The SOXX fund holds a broad basket of chip companies with caps on individual weights, which made it a direct way to capture the wide rally. Fund flows into sector ETFs often amplify moves like this, because buying the basket lifts smaller members alongside the leaders.

Risks to the Rebound

The gains proved fragile. After the close, reports that Nvidia's board was preparing to remove chief executive Jensen Huang sent its shares down sharply after hours, and on Thursday the company announced that Huang had resigned, with CFO Colette Kress as interim chief executive, which weighed on Asian chip stocks. Rising Treasury yields also pose a headwind for richly valued growth shares. Investors will need confirmation from upcoming reports that AI demand remains as strong as CoreWeave suggested. Export rules are another variable, since lawmakers are pressing for tighter controls on chip shipments to Asian intermediaries after the Nvidia investigation. Valuations have also rebuilt quickly: after a one-day gain of this size, any disappointment from a large customer or a supplier could trigger a similar reversal. The index remains below its autumn peak, and the recent correction showed how quickly crowded AI trades can unwind when sentiment shifts.

Where Things Stand

The SOX index recovered to its highest close in more than a week on a single strong customer report, a gain of about 5.7% in one session. The next tests come from Applied Materials results after the close on November 12 and Nvidia's report on November 17. Any Leadership change at Nvidia will also shape sentiment across the chip sector. Any upward revision to AI spending plans from large cloud providers would reinforce the rebound, while a cut would test it quickly.