Key Highlights

  • SanDisk closed at $1,960 on June 23, down $310.13, as Korean memory peer losses of more than 12% triggered contagion across US memory names.
  • The stock had surged nearly 5,000% since its 2025 spinoff from Western Digital, leaving it exposed to aggressive profit-taking in any risk-off session.
  • A circulated valuation note flagged SanDisk's price-to-earnings ratio above 79 as unsustainable relative to cyclical memory industry norms.
  • Year-to-date gains still exceeded 727% heading into the close, underscoring the extraordinary run preceding the June 23 pullback.

 

SanDisk Corp. (NASDAQ:SNDK) fell 13.64% to close at $1,960 on June 23, 2026, as a combination of Korean memory sector contagion and renewed valuation scrutiny triggered broad profit-taking in one of the year's most spectacular performers.

The stock had been on an extraordinary trajectory since its spinoff from Western Digital in February 2025, rising nearly 5,000% as investors positioned it as a pure-play beneficiary of NAND flash demand driven by AI data centres and enterprise storage buildout. That ascent had pushed its trailing price-to-earnings ratio above 79, well above levels typically associated with cyclical memory producers.

On June 23, the South Korean Kospi fell 10%, pulling Samsung Electronics and SK Hynix each lower by more than 12% in local trading. The Korean declines reflected a combination of global risk aversion and concerns about the pace of AI capital spending that had underpinned the entire memory complex. With SanDisk trading at a stretched multiple, institutional desks moved quickly to reduce exposure.

A circulated note from a major investment bank added to the pressure, questioning whether SanDisk's valuation incorporated sufficiently conservative assumptions for the next down cycle in NAND pricing. Memory markets are structurally cyclical, and the note argued that the premium priced into SanDisk's shares left little margin for any moderation in demand from hyperscalers.

Despite the session's severity, SanDisk's year-to-date gain of more than 727% means investors who entered early in 2026 remain significantly profitable. The pullback brought the stock to approximately 83% of its 52-week high of $2,350.