Key Highlights

  • Sandisk (NASDAQ:SNDK) closed up 13.69% at about USD 977.69 on November 11, 2026, while Arm Holdings gained 12.05%.
  • Memory makers led the rebound, with Micron up 11.89% to about USD 811.30 and Western Digital up roughly 8%.
  • The semiconductor index rose about 5.7% to its highest close since November 3, with every component higher.
  • The move reversed part of a steep early November selloff in which Sandisk fell more than 22% and Micron about 17.5% in a single session on November 5.

The Catalyst Behind the Rally

The rebound began with an Earnings report from outside the chip sector. On November 10, a large AI cloud provider reported third quarter Revenue of USD 3.66 billion, up 168% year over year, raised its 2026 revenue outlook and said it expected about USD 9 billion of customer prepayments and deposits within three months. That eased fears, which had built through early November, that the AI Data Center build-out was slowing or struggling to find financing. On November 11, investors rotated back into the suppliers that benefit most directly from that spending. The technology sector gained 3.23%, the Nasdaq rose 1.6% and the Nasdaq-100 2.28%. Memory makers moved most because their earnings are the most leveraged to data center demand, with AI servers requiring large amounts of high bandwidth DRAM and enterprise flash storage. Breadth was unusually strong, with advancing issues outnumbering decliners on both major exchanges and every member of the semiconductor index finishing higher.

Why Memory and Chip Design Led

Shares of Sandisk (NASDAQ:SNDK) rose 13.69% as investors bet that AI inference workloads will keep Demand for high-capacity enterprise solid state drives strong, supporting flash pricing into 2027. Micron rose 11.89% and Western Digital about 8%, and hard disk maker Seagate gained about 10%, as storage demand from data centers remained a central theme. Part of the move was a recovery from oversold levels. On November 5, Sandisk had fallen more than 22% and Micron about 17.5% in a single day, so the bounce reflected short covering and repositioning as well as new buying. Some market commentary argued that the pullback had improved the risk and reward balance in memory names. Arm, whose instruction set and designs are used in data center processors as well as smartphones, gained 12.05% as investors priced in growing Royalty income from custom AI chips built by large cloud companies.

What Could Interrupt the Rebound

The recovery was fragile. After the close, the largest AI chip designer fell about 8% in extended trading on media reports that its board was preparing to remove its chief executive, and several AI hardware names slipped after hours. Memory stocks are also cyclical, and the scale of recent swings, with double-digit moves in both directions within a week, shows how sensitive valuations are to any sign of slowing AI orders or rising supply. Investors will watch results from chip equipment makers, including a report due on November 12, for signals on memory capacity Investment in 2027, as well as pricing data for DRAM and flash. Arm's next catalysts are licensing deals with cloud providers and royalty trends. Rising Interest Rate expectations, with a December Federal Reserve hike priced, could also pressure high-multiple technology shares if bond yields climb further and investors rotate toward cheaper sectors.

Where Things Stand

Sandisk (NASDAQ:SNDK) jumped 13.69% and Arm 12.05% on November 11, 2026 as memory and chip design stocks led a 5.7% rebound in semiconductors after a strong AI cloud earnings report. The move recovered part of a sharp early November selloff. Leadership uncertainty at the largest AI chip company and the cyclical nature of memory remain key risks.