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SK Hynix Seoul shares clock worst session, sinking over 15% after Nasdaq debut

7/21/2026

South Korean shares of SK Hynix Inc.

fell more than 15% in Seoul on Monday, the worst single-day decline the chipmaker's local listing has recorded, arriving in the session immediately following its blockbuster Nasdaq debut.

The gap the tape reveals The number that matters: more than 15% lower in Seoul. For a buy-side reader, that print sits in sharp contrast to what had been described as a stellar Nasdaq performance.

The two data points arrived in sequence. Then the steepest domestic session on record for SK Hynix. The source does not attribute the Seoul drop to a specific trigger beyond its timing relative to the Nasdaq debut.

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