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The Kospi fell 3.65% to 6,384 as foreign selling reached 199 trillion won this year, even as Microsoft's new AI chip points to far more HBM demand.
The Kosdaq dropped 4.83%, and analysts say thin supply and demand, with SK Hynix's buyback nearly complete, makes the market sensitive to small negatives. Meanwhile, Microsoft's Maia 300 raises HBM per rack about 2.7 times, and its chip chief said the company is securing supply up to five years ahead. Separately, SK Hynix's U.S. shares trade at a 40% premium, bond funds drew 1.6 trillion won in four days, and the Bank of Korea governor expects inflation above 2% for some time.

Sources:
- Microsoft Runs AI Data Centers on Its Own HBM-Heavy Chip: Samsung and SK Hynix Demand Triples — Seoul Economic Daily, Oct 12, 2026
- Foreigners Sell 200 Trillion Won in the Kospi This Year, and the Buyback Shield Fades — Seoul Economic Daily, Oct 12, 2026
- Microsoft's Maia Chief: "HBM Is Short, We're Securing Supply Five Years Ahead" — Seoul Economic Daily, Oct 12, 2026
- With the Lockup Lifted, Will SK Hynix Issue More ADRs? — Seoul Economic Daily, Oct 12, 2026
- Bond Funds See Heavy Inflows: 1.6 Trillion Won in Four Days — Seoul Economic Daily, Oct 12, 2026
- BOK Governor Shin: "Inflation Will Stay Above 2% for Some Time" — Seoul Economic Daily, Oct 12, 2026

About AI PRISM:
AI PRISM is Seoul Economic Daily's WAN-IFRA award-winning newsroom AI series, delivering Korean economic news adapted for global audiences. Episodes are produced with AI assistance and reviewed by a human editor.

Tags:
#KOSPI #KOSDAQ #ForeignSelling #SKHynix #HBM #BondFunds #AIPRISM #SeoulEconomicDaily #WANIFRA

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00:02You're listening to AI Prism from Seoul Economic Daily.
00:06The Kospi fell 3.65% to 6,384, its first closed below 6,400 in two months.
00:17Foreign investors have sold 199 trillion won of Korean stocks this year,
00:22and SK Hynix's buyback is nearly done.
00:26Microsoft's new AI chip will use 2.7 times more HBM per rack.
00:31Yet SK Hynix's U.S. shares trade 40% above its Korean shares.
00:37And bond funds took in 1.6 trillion won in just four trading days.
00:42It's Tuesday, October 13th.
00:44Here's what today's story could mean for the Korean market.
00:47Korea's market reopened after the October 8th and 9th holidays to a weak finish in U.S.
00:52Chip stocks.
00:53Meanwhile, strategists say thin supply and demand is making Korean stocks react sharply
00:58to small negatives, even with record corporate earnings.
01:02And big tech is signaling it needs far more memory, which is the long-term case for Korea's chipmakers.
01:08Here's what the numbers show.
01:09The KOSPI closed down 3.65% at 6,384.24, its first closed below 6,400 since August 11th,
01:20and the KOSDAQ fell 4.83% to 849.19.
01:25Foreign investors sold a net 2.0115 trillion won,
01:30lifting their year-to-date net selling to 199.1 trillion won.
01:35The Philadelphia Semiconductor Index fell 3.78%,
01:40and Micron 5.42%,
01:42while Korea was closed on October 8th and 9th.
01:45Yet Taiwan's TayX barely moved,
01:48down 0.02%.
01:50Microsoft's Maya 300 uses 8 HBM4 stacks per chip,
01:55and 96 accelerators per rack, raising HBM per rack from 288 to 768, about 2.7 times.
02:06SK Hynix's U.S.
02:08ADR closed at $169.03 on October 9th,
02:13a 40.42% premium to its Korean shares,
02:17with its buyback about 90% complete and expected to finish around October 20th.
02:23Bond funds drew $1.5911 trillion won from October 1st to 7,
02:29above all, of September's $1.1769 trillion won,
02:34as the Bank of Korea governor said inflation will stay above 2% for some time.
02:38So what does this mean for investors watching the board today?
02:41Earlier, we said foreign investors have sold $199 trillion won this year,
02:46and SK Hynix's buyback is nearly done.
02:49Here's what that actually means for you.
02:51Analysts say supply and demand is thin, so even small negatives hit hard.
02:57And they expect a gradual recovery, rather than a sharp V-shaped rebound,
03:01unless rates in oil, calm, and chip profit growth looks durable.
03:05Watch SK Hynix's October 27th earnings,
03:09where observers expect guidance on further buybacks and ADR issuance.
03:13And big tech earnings later this month for AI spending signals.
03:18This is market context, not investment advice.
03:22What to watch.
03:24SK Hynix's third quarter earnings, expected around October 27th, for buyback and ADR guidance.
03:31Big tech earnings at the end of this month,
03:34where AI revenue growth and investment plans will be checked.
03:37And this month's Bank of Korea rate meeting,
03:40around which one analyst expects short-term yields to rise sharply.
03:44That's today's AI Prism, stock investors.
03:49This episode was produced with AI assistance based on Seoul Economic Daily reporting,
03:54and reviewed by a human editor.
03:57AI Prism is a Juan Ifra award-winning series.
04:00We'll be back tomorrow.
04:01You've been listening to AI Prism from Seoul Economic Daily.

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