SK hynix Inc. saw its stock fall sharply in early trading Thursday, after recent rallies driven by strong tech stock sentiment.

The shares were trading at 276,000 won ($198.48) as of 9:38 a.m., down 6.76 percent from the previous session on the Korean stock market. Itslargest shareholder, SK square Co., and SK Inc. also saw their shares tumble 8.62 percent and 6.49 percent respectively.

The downward movements reflect rising concerns as profit-taking pressure mounts following recent gains and a weakening outlook for memory semiconductor prices.

Earlier, Daishin Securities Co. revised its 2026 forecast for the average selling price (ASP) of HBM from 7 percent growth to a 6 percent decline compared to 2025, citing the potential erosion of HBM4 price premiums.

The brokerage noted that SK hynix’s short-term revaluation potential is limited from a valuation perspective and its stock appeal has declined compared to the past. However, it said it is not yet time to downgrade its investment rating to hold, as SK hynix remains a market leader.

Meanwhile, artificial intelligence (AI) cybersecurity specialist Sands Lab Inc. saw its shares surge after the company announced it registered three security technologies with the U.S. Patent and Trademark Office (USPTO).

Sands Lab shares were trading at 10,330 won as of 9:12 a.m., up 26.59 percent from the previous session, after rising as high as 10,600 won immediately after the open.

Sands Lab said the patents cover technologies for malware analysis automation, real-time natural language analysis, and automatic generation of natural language security reports.

SK hynix shares closed at 269,500 won, while Sands Lab shares closed at 9,530 won.

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