Key Highlights

  • Sandisk fell 22.26% on Thursday, November 5, 2026, making it the worst performer in the S&P 500 as a broad AI and chip selloff hit memory and storage names.
  • Western Digital dropped 17.35% and Seagate fell more than 16%, so all three storage names lost at least 16% in a single session.
  • The Nasdaq Composite fell 5.52% and the S&P 500 lost 4.36%, the worst session since April 2025, with technology shares down 8.00%.
  • Qualcomm fell about 19% despite strong results because its outlook cited a memory-component shortage for smartphone chips, per published reports.

Memory and Storage Shares Fall in Unison

Sandisk (NASDAQ:SNDK) fell 22.26% on Thursday, November 5, 2026, the largest decline among S&P 500 members. Western Digital (NASDAQ:WDC) dropped 17.35% in the same session. Seagate (NASDAQ:STX) fell more than 16%. The company makes flash storage used in phones, computers and data centers, while Western Digital and Seagate focus on hard drives. One market wrap reported Micron and AMD each down about 17% and Nvidia down 9%, a figure not confirmed by a second source. The common thread was a rotation out of AI-linked hardware.

What Set Off the AI Hardware Selloff

Market wraps tied the selling to fears that Democratic wins in Congress, Texas and Georgia could slow data-center construction through tighter rules or local backlash. Weak guidance from Qualcomm, whose outlook pointed to a memory-component shortage, also weighed on chip names. The mechanics matter for Sandisk (NASDAQ:SNDK): Demand for flash storage is tied to AI data-center buildouts, so any hint of delays can reprice expectations quickly. The shares had no company-specific announcement in the material reviewed, so the move looks sector-driven. The Nasdaq Composite fell 5.52% and the S&P 500 lost 4.36% that day. Chip makers including Broadcom and Intel each fell about 10%, which shows the pressure was not limited to storage. A published report also described the pullback as the unwinding of a crowded AI trade.

Cycle Risk and What Comes Next for Sandisk

Memory and storage pricing is cyclical, and shares of such companies often move more than the market in both directions. A drop above 20% in a single session is unusual for an S&P 500 member and reflects how crowded the AI hardware trade had become, a reading from market commentary rather than a verified positioning figure. Sandisk (NASDAQ:SNDK) and its peers will be judged on whether data-center orders hold, whether pricing stays firm and whether the selloff spreads or fades. Futures were mixed on Friday, and the October jobs report arrives before the open, which could add to volatility. Large single-day drops can partly reverse or extend, and no outcome is assured. Investors should also weigh balance-sheet strength, product pricing and customer concentration when comparing the three names, since each depends heavily on a handful of large cloud buyers.

Where Things Stand

The slump traced to a sector-wide unwind, not a Sandisk-specific event. Sandisk (NASDAQ:SNDK) lost 22.26% as AI-linked hardware sold off on data-center worries and a weak Qualcomm outlook, with Western Digital down 17.35% and Seagate down more than 16%. No company announcement was found to explain the move, and one memory shortage reading that hurt Qualcomm sits oddly beside the storage selloff. Next markers are Friday trading, any data-center policy news and the next company updates. The figures reflect November 5 closing data and may change as Friday trading develops and as investors reassess how exposed each company is to data-center spending.