Micron falls about 4% on Monday after CXMT reportedly advances stacked DRAM

Micron fell about 4% on Monday, October 12, 2026, in the morning session. The Motley Fool attributed the move to reports that China's ChangXin Memory Technologies (CXMT) has made progress on stacked DRAM using a 4F-square cell architecture, which raises density, with a product for AI data centers planned later in 2026. The article also noted that SK Hynix and Samsung have reported similar progress, which adds competition to Micron's DRAM share.

• Down 4.2% at 10:55 a.m. ET; a later quote showed $989.04, down 3.88%
• Implied prior close about $1,029.00; day range $978.50 to $1,002.67
• Cause cited: CXMT progress on stacked DRAM (4F-square architecture)
• SK Hynix and Samsung have reported comparable stacked DRAM progress