Micron stock traded at $902.43 after hours on October 29, 2026, following a 4.98% decline in the regular session. South Korean chip shares also fell sharply the next morning, with SK hynix down 8.65% by late morning in Seoul.

Key Takeaways

  • Micron closed Thursday at $934.27 and traded 3.41% lower after hours.
  • The KOSPI was down 5.25% at 11:20 a.m. Seoul time on Friday.
  • Sandisk reported revenue above expectations, while SK hynix recently posted record quarterly operating profit.

Micron stock extends its decline after hours

Micron shares closed at $934.27 on Thursday, October 29, down $48.96 from Wednesday’s $983.23 close. The stock traded between $927.24 and $971.01 during the regular session.

At 7:59 p.m. Eastern time Thursday, the shares traded at $902.43 after hours. That quote was below the regular-session close but did not establish where Micron would open on Friday.

South Korean shares fall on Friday

At 11:20 a.m. Seoul time on October 30, the KOSPI was down 5.25% at 5,626.02. SK hynix shares had fallen 8.65%, while Samsung Electronics was down 6.03%.

The declines followed a difficult US session for technology stocks: Alphabet fell 12.6% on Thursday after reporting its quarterly results. The timing of the moves does not establish a single cause for the chip-stock declines.

Memory results provide contrasting backdrop

Sandisk reported fiscal first-quarter revenue of $11.0 billion, above expectations of about $10.7 billion. Its data-center revenue rose 61% from the prior quarter, and the company issued revenue guidance of $12.2 billion to $12.6 billion. Sandisk shares fell 5.32% during Thursday’s session and declined further after hours.

Earlier in the week, SK hynix reported preliminary third-quarter operating profit of 83.3338 trillion won. In its third-quarter results announcement, the company also said long-term agreements covered more than 50% of its production capacity for 2027 and 2028. The results and agreements do not establish what drove Friday’s share-price decline.

Next milestone

The next confirmed market milestone is Friday’s US trading session, when Micron shares will reopen for regular trading.

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