Kospi Plunges Over 8% as AI Regulation Fears Hit Korean Chipmakers

what happened

Barron's reports that South Korean stocks are drawing close attention ahead of Sunday's session, after the benchmark Kospi index dropped more than 8% on Friday. The slide followed a sharp fall in US tech shares on Thursday and fears that Democratic-led state and federal governments could tighten rules on AI expansion.

Shares of Samsung Electronics lost more than 6% in local trading, while SK Hynix's Korea-listed stock fell over 10%. Together the two companies make up nearly half of the index. The Kospi broke below the key 5,000-point level and was halted for 20 minutes just three minutes into the session. It reopens at 9 a.m. Monday local time.

Analysts quoted by Barron's see further risk. Arthur Budaghyan of BCA Research said domestic retail investors, who had been large buyers for 9-12 months, have not yet capitulated and that momentum has turned sharply negative. Goldman Sachs noted the Kospi has fallen more than 44% from its June peak and said a further decline to 50% cannot be ruled out.

why it matters

The index's reliance on two chipmakers means the AI chip demand cycle and US regulatory headlines feed directly into Korean equities. Investors will watch whether retail selling continues and whether Korean authorities step in to stabilize the market.

market impact

Korean equities: heavy selling in Kospi, Samsung and SK Hynix on AI data center regulation fears.

• ▼Kospi pressure down — retail selling and negative momentum in chip stocks deepen the sell-off
• ▼Samsung Electronics pressure down — fears of tighter AI data center rules weigh on expected chip demand
• ▼SK Hynix pressure down — large index weight and reliance on hyperscaler demand for memory chips

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