Micron and SanDisk shares fell roughly 8-9% in premarket trading after South Korea's KOSPI index crashed nearly 10%, dragging the global semiconductor

Micron shares are still up over 260% since the start of the year, when the chipmaker’s stock traded around the $300 mark.

South Korea's KOSPI index plunged 8.3% as Samsung and SK Hynix led a semiconductor sell-off, triggering circuit breakers for the third time in 2026.

On Monday, AI leaders powered higher. Not this morning.