News/Markets/Oct 13, 2026

SK hynix closes down 10.1% in Seoul on CXMT claim and heavy foreign selling

SK hynixSKHYHBM (high-bandwidth memory)

SK hynix's Seoul shares closed 10.09% lower at 1,443,000 won on October 13, Samsung Electronics fell 7.39%, and the KOSPI closed down 5.46% at 6,035.35. Foreign investors sold a net 4.51 trillion won. Causes cited were CXMT's 4F² claim, a Financial Times report that OpenAI's annualized revenue was about 30% below a previously reported figure, and the loss of share buybacks that had been cushioning the stock.

  • SK hynix Seoul close: down 10.09% to 1,443,000 won
  • Samsung Electronics: down 7.39% to 232,000 won
  • KOSPI close: down 5.46% to 6,035.35
  • Foreign net selling: 4.51T won
SKHY around the story · hourly24 h reaction ▼ 3.83%
137.43154.19170.95SK hynix closes down 10.1% in Seoul on CXMT claim and heavy foreign selling1Oct 9Oct 11Oct 13Oct 15Oct 17

Moves this explains

ALAB−10.33%Oct 13 · Fell about 10.3% as the AI hardware selloff deepened, with SK hynix down 10.1% in Seoul on a CXMT memory claim and worries about AI funding and higher rates weighing on AI-exposed stocks.AVGO−4.28%Oct 13 · Fell about 4.3% on a day when the S&P 500 fell 1.3% and memory-chip stocks were hit by a claim from China's CXMT about a denser DRAM design (SK hynix ADR -9.2%). No Broadcom-specific news was reported.BE−12.84%Oct 13 · Fell about 12.8% as AI-infrastructure stocks sold off with chips after SK hynix dropped about 10% in Seoul on China's CXMT memory claim; the S&P 500 lost 1.3%.CRDO−12.16%Oct 13 · Fell about 12.2% as the AI hardware selloff deepened, with SK hynix down 10.1% in Seoul on a CXMT memory claim and worries about AI funding and higher rates weighing on AI-exposed stocks.GEV−8.08%Oct 13 · Fell about 8.0% on a day when the S&P 500 fell 1.3% and memory-chip stocks were hit by a claim from China's CXMT about a denser DRAM design; AI-linked names led, with Vertiv -9.8% and Broadcom -4.3%. No GE Vernova-specific news was reported.MRVL−11.60%Oct 13 · Fell about 11.6% in a broad chip selloff after SK hynix dropped about 10% in Seoul on China's CXMT memory claim; the S&P 500 lost 1.3%.NBIS−14.53%Oct 13 · Fell about 14.5% as the AI hardware selloff deepened, with SK hynix down 10.1% in Seoul on a CXMT memory claim and worries about AI funding and higher rates weighing on AI-exposed stocks.NVDA−4.90%Oct 13 · Fell about 4.9% as chip and AI-infrastructure stocks sold off for a fifth straight session, after memory maker SK hynix dropped about 10% in Seoul on China's CXMT memory-design claim and heavy foreign selling; the S&P 500 lost 1.3%.ORCL−10.96%Oct 13 · Fell about 11.0% as the AI hardware selloff deepened, with SK hynix down 10.1% in Seoul on a CXMT memory claim and worries about AI funding and higher rates weighing on AI-exposed stocks.SKHY−9.19%Oct 13 · Fell about 9.2% after SK hynix shares dropped about 10% in Seoul when China's CXMT said it had advanced a denser DRAM cell design, with heavy foreign selling; the S&P 500 fell 1.3%.SPY−1.33%Oct 13 · Fell about 1.3% on a day when the S&P 500 fell 1.3% and memory-chip stocks were hit by a claim from China's CXMT about a denser DRAM design, with AI-linked names such as Vertiv, GE Vernova and Broadcom falling 4% to 10%.TSM−5.04%Oct 13 · Fell about 5.0% as chip and AI-infrastructure stocks sold off for a fifth straight session, after memory maker SK hynix dropped about 10% in Seoul on China's CXMT memory-design claim and heavy foreign selling; the S&P 500 lost 1.3%.VRT−9.75%Oct 13 · Fell about 9.8% on a day when the S&P 500 fell 1.3% and memory-chip stocks were hit by a claim from China's CXMT about a denser DRAM design; AI-linked names led the drop. No Vertiv-specific news was reported.
Source
The Korea Times
Oct 13, 2026
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