KOSPI falls 7.4% as Samsung and SK Hynix drop 10%
South Korea’s benchmark index plunged 7.4% on Oct. 12, hitting a circuit‑breaker, after Samsung Electronics and SK Hynix fell about 10% amid AI‑spending doubts and high U.S. Treasury yields.
Key points
- KOSPI Composite Index fell 7.4% on Oct. 12, triggering a circuit‑breaker.
- Samsung Electronics and SK Hynix each dropped roughly 10%.
- Foreign investors sold tech stocks amid doubts about AI spending and near‑24‑year‑high U.S. Treasury yields.
- The yield rise followed the September CPI report released on Oct. 14, 2026.
- The sell‑off was linked to concerns over AI investment and high U.S. interest rates.
On Tuesday, October 12, 2026, South Korea's benchmark KOSPI Composite Index dropped 7.4% in a single session, triggering the market’s circuit‑breaker.
The decline was led by semiconductor makers Samsung Electronics and SK Hynix, each falling roughly 10% as foreign investors sold technology stocks amid doubts about artificial‑intelligence spending.
Analysts linked the sell‑off to near‑24‑year‑high U.S. Treasury yields, which had risen after the September Consumer Price Index report released on October 14, 2026.
Your questions, answered
Why did the KOSPI fall 7.4% on Oct. 12, 2026?
The index dropped 7.4% after Samsung Electronics and SK Hynix fell about 10% amid AI‑spending doubts and high U.S. Treasury yields.
What caused the sell‑off of Samsung and SK Hynix?
Foreign investors sold technology stocks due to doubts about artificial‑intelligence spending and near‑24‑year‑high U.S. Treasury yields.
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