CXMT surges over 500% in Shanghai IPO debut, triggering global memory stock sell-off

David Moadel Mon, July 27, 2026 at 8:07 AM PDT | 5 min read

• SNDK
• MU
• SKHY
• WDC
• ^NDX

Quick Read

• SanDisk sinks 12% and Micron drops 5% as China's CXMT surges 500% in its Shanghai debut, rattling memory stocks sector-wide.
• Apple testing CXMT chips accelerates fears of Chinese memory reaching top-tier customers, as Western Digital falls 7% and the DRAM ETF drops 4%.
• SanDisk's 505% YTD gain and Micron's 223% run made both stocks ripe for profit-taking, with SK Hynix Q2 earnings due July 28.
• Act now: the analyst who called NVIDIA in 2010 just named his top 10 AI stocks — and Micron Technology didn't make the cut. Grab the names FREE today.

Memory and storage stocks are selling off sharply Monday morning as the broader NASDAQ 100 rises and falls. SanDisk (NASDAQ:SNDK) stock is down 12% to $1,270, while Micron Technology (NASDAQ:MU) shares are off 5% to $871.

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Western Digital (NASDAQ:WDC) stock is down 7% to $483, and SK Hynix (OTC:SKHY) ADRs are down 6% to $145 after giving back an earlier Monday gain ahead of the company's Q2 2026 report tomorrow after the U.S. close. The coordinated selloff spans NAND and DRAM names alike, signaling a sector-wide reaction rather than a single-stock story.

The Roundhill Memory ETF (NASDAQ:DRAM) is down 4% to $51, reflecting the coordinated hit across memory names on an otherwise up market day. The ETF's decline highlights how concentrated the selling is within the memory theme.

The trigger is a blockbuster Shanghai IPO that has revived long-running fears of Chinese memory competition. That anxiety is landing on top of enormous year-to-date (YTD) gains, giving today's action the look of both fresh news and profit-taking after a historic run.

CXMT IPO Sparks Competition Fears

The catalyst is China's ChangXin Memory Technologies (CXMT), which soared more than 500% in its Shanghai STAR Market debut to become mainland China's most valuable company at approximately $540 billion in market cap. The offering raised between $8.6 billion and $9.8 billion.

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CXMT is the world's fourth-largest DRAM maker at 8% share, trailing Samsung at 36%, SK Hynix at 29%, and Micron at 24%. New Chinese supply could eventually pressure DRAM and NAND pricing, which has expanded gross margins across the incumbents throughout 2026.

Apple (NASDAQ:AAPL) is reportedly testing CXMT's DRAM chips, adding weight to the concern that Chinese memory could reach top-tier customers sooner than bulls had assumed. Analysts note that CXMT remains constrained by U.S. export controls on advanced chipmaking tools and is unlikely to ease the near-term memory shortage.

Two political headwinds may also cap CXMT's near-term reach. The company sits on the Pentagon's list of firms with alleged military ties, and some U.S. lawmakers have signaled interest in restricting American purchases of its chips.

Profit-Taking Meets a Massive YTD Run

Today's move lands on top of extraordinary YTD gains. SanDisk stock had climbed 505% YTD heading into today, while Micron shares were up 223% and Western Digital stock had gained 202%.

SanDisk's rally has been fueled by a fundamental transformation. The company posted fiscal Q3 2026 revenue of $5.95 billion and non-GAAP EPS of $23.41, with a 78.4% gross margin. SanDisk CEO David Goeckeler called it a "fundamental inflection point" for the business.

Micron's fiscal Q3 2026 revenue landed at $41.46 billion, up 345.7% year over year (YoY), with non-GAAP EPS of $25.11. The company guided Q4 2026 revenue to $50 billion, underscoring the pricing power that new Chinese competition may now threaten.