CXMT surges 500% in Shanghai debut, triggering global memory stock selloff

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

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.

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.

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.

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.
• 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.
• Micron shares were up 223%.
• 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 supply could eventually erode.