Foreigners swept up 2.5 trillion won in spot and futures: The real reason the market surged today / How the market will move after Chuseok | CEO Kim Dong-yeop

[Real Market Conditions] Foreigners swept up 2.5 trillion won in spot and futures… The real reason the market surged today / How the market will move after Chuseok | CEO Kim Dong-yeop
Watch on YouTube ↗  |  September 18, 2026 at 11:00  |  26:08  |  815 Money Talk (815머니톡)
Speakers
Kim Dong-yeop — CEO, Decenter

Summary

Kim Dong-yeop, CEO of S1 Investment Research, reviews the September 18 Korean market surge, arguing that AI speed-control fears have faded and AI infrastructure demand remains strong. He highlights memory semiconductors, optical communications, AI power infrastructure, cybersecurity, space/aerospace events, nuclear/gas tied to the US investment deal, fuel cells, and small/mid-cap theme rotation. He expects near-term supply noise around Chuseok but a stronger KOSPI after Samsung's early-October preliminary earnings.

  • AI speed-control worries eased after Jensen Huang's confident chip-demand comments.
  • Samsung and SK hynix led as foreigners returned to AI memory names.
  • Optical communications, power equipment, and cybersecurity were highlighted as AI-linked sectors.
  • Space/aerospace has catalysts from Starship and Nuri launch events.
  • Korean nuclear and gas stocks depend on the US investment deal outcome.
  • Fuel-cell and Bloom Energy value-chain names drew attention on AI power demand.
  • The speaker expects small/mid-cap theme rotation before Chuseok and a stronger KOSPI after early-October earnings.
  • Near-term risks include individual selling and the end of buyback support around mid-October.
Ideas
Kim Dong-yeop CEO, Decenter 0:39
AI demand intact despite speed-control noise.
The AI speed-control scare was neutralized by Jensen Huang's confident comments that Nvidia will sell twice as many chips next year, while Trump and Korean officials also pushed back. The speaker therefore argues that AI infrastructure demand remains intact and that AI-linked bottlenecks should stay supported.
AIQ AI Data Centers HIGH
Kim Dong-yeop CEO, Decenter 2:36
Memory shortage drives Samsung, SK hynix upside.
Samsung Electronics' own forecast implies strong H2 semiconductor operating profit, and its early-October preliminary 3Q results should confirm at least around 11 trillion won of profit. DRAM shortages are expected through 2031, lead times are long, order cancellations are absent, and LTAs support several years of upward profit; Micron's late-September earnings are also expected to be strong.
005930.KS 000660.KS MU HIGH
Kim Dong-yeop CEO, Decenter 7:01
AI networking lifts optical communications demand.
Optical communications and telecom equipment are hot because AI data centers need high-spec packages and flexible networking, creating telecom-equipment shortages. The speaker says both US and Korean optical communications names are rising, with Sung Ho Electronics and Bitsaem Electronics showing leading momentum.
Optical communications IYZ 043260.KQ Bitsaem Electronics MED
Kim Dong-yeop CEO, Decenter 7:12
AI power bottlenecks favor transformers, wires.
AI data centers keep running into power shortages, making transmission and distribution equipment a persistent bottleneck. The speaker highlights transformers and electric wire stocks as beneficiaries as AI investment continues.
Transformers AI-SECTOR Electric wires HIGH
Kim Dong-yeop CEO, Decenter 7:28
AI growth stokes cybersecurity, quantum security.
The AI speed-control debate and AI proliferation raise cyber and hacking risks. The speaker says cybersecurity was a leading US sector, and quantum-resistant security names move alongside it; as AI expands, communication and security markets should expand together.
CIBR Quantum-resistant security MED
Kim Dong-yeop CEO, Decenter 13:35
US deal may lift nuclear, gas.
The US investment agreement is still being negotiated, and Korea wants at least two of eight reactors to use Korean-type technology. If the deal is favorable, Korean nuclear and gas-related stocks could benefit; if all reactors are US-type, disappointed expectations could hit those stocks.
KORU Korean gas-related stocks MED
Kim Dong-yeop CEO, Decenter 16:14
KOSPI to rise after Chuseok earnings.
Despite near-term individual selling and buyback support ending around mid-October, the speaker expects Samsung's early-October preliminary earnings and strong AI/memory results to help the index overcome the post-Chuseok gap. After mid-October, the KOSPI is expected to move higher again.
EWY MED
Kim Dong-yeop CEO, Decenter 16:21
Small/mid-cap theme rotation leads pre-Chuseok.
From late September into early October, the speaker expects large caps to lag while small- and mid-cap themes rotate quickly across areas such as secondary batteries, nuclear, quantum, telecom, robots, cosmetics, and space. This rotation is treated as the market's normal breadth and the favored style in that window.
Korean small/mid-cap thematic stocks MED
Kim Dong-yeop CEO, Decenter 20:04
Space catalysts create event-driven setup.
SpaceX's Starship orbital test on September 22 and Korea's Nuri fifth launch around October 7 are major catalysts. If Starship succeeds, it would be an early step toward Musk's space data-center project, supporting the space/aerospace theme around Chuseok.
Space/Aerospace MED
Kim Dong-yeop CEO, Decenter 21:50
AI power shortage lifts fuel cells.
AI power shortages make immediately deployable hydrogen and fuel-cell power attractive. Nancy Pelosi's disclosed Bloom Energy purchase has driven Bloom and Korean value-chain names higher, so the speaker wants investors to watch Korean fuel-cell and renewable names, especially those with Bloom Energy business ties, next week.
HYDR Korean Bloom Energy value chain BE MED
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This 815 Money Talk (815머니톡) video, published September 18, 2026, features Kim Dong-yeop discussing AIQ, AI Data Centers, 005930.KS, 000660.KS, MU, Optical communications, IYZ, 043260.KQ, Bitsaem Electronics, Transformers, AI-SECTOR, Electric wires, CIBR, Quantum-resistant security, KORU, Korean gas-related stocks, EWY, Korean small/mid-cap thematic stocks, Space/Aerospace, HYDR, Korean Bloom Energy value chain, BE. 10 trade ideas extracted by AI with direction and confidence scoring.

Speakers: Kim Dong-yeop  · Tickers: AIQ, AI Data Centers, 005930.KS, 000660.KS, MU, Optical communications, IYZ, 043260.KQ, Bitsaem Electronics, Transformers, AI-SECTOR, Electric wires, CIBR, Quantum-resistant security, KORU, Korean gas-related stocks, EWY, Korean small/mid-cap thematic stocks, Space/Aerospace, HYDR, Korean Bloom Energy value chain, BE