KOSPI Crashes -4.11% Yet SK Hynix +2.59%, KOSDAQ +3.01% — Triple-Witching Split
Hey, Dongchun here.
KOSPI closed -4.11% and KOSDAQ +3.01% on June 11, 2026. Here is what moved the Korean stock market today and what foreign investors should watch for tomorrow.
The single thing that matters today is that this was an expiry-day shakeout, not a supercycle break. The KOSPI fell -4.11% on triple-witching unwinds and profit-taking after a +8.18% melt-up, yet SK Hynix actually rose +2.59% and the KOSDAQ gained +3.01% — the memory thesis held while the index mechanics did not. Watch whether foreigners come back to chips tomorrow, because US futures are pointing up while Korea sold off alone.
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1. KOSPI and KOSDAQ Close: Korean Stock Market Today
The KOSPI plunged -4.11% (-332.98 points) to 7,763.95, slicing through both the 8,000 and 7,800 levels in a single session. The drop unwound much of the prior day's +8.18% melt-up. In contrast, the KOSDAQ rose +3.01% (+29.12 points) to 996.93, pushing back toward 1,000 — a rare same-day split between the two benchmarks.
The single biggest driver was Korea's quarterly triple-witching, the simultaneous expiry of KOSPI 200 futures and options held on the second Thursday of March, June, September and December. Profit-taking pressure built up during the +8.18% surge collided with expiry-day program selling and liquidation, dragging large-cap names lower while domestic money rotated into KOSDAQ growth stocks.
This was a narrow, mechanical decline rather than broad panic. The two largest weights held up far better than the index — Samsung Electronics fell only -1.16% and SK Hynix actually rose +2.59% — signaling the sell-off was led by expiry flows and non-semiconductor large-cap profit-taking, not a memory-cycle break. The VIX rose +6.95% to 21.25, elevated but still below the panic zone.
| Index | Close | Change | Volume |
|---|---|---|---|
| KOSPI | 7,763.95 | -4.11% | Expiry-heavy session |
| KOSDAQ | 996.93 | +3.01% | Growth-led rotation |
2. Foreign Investor Flow in Korean Stocks
The dominant flow today was expiry-day liquidation. Hedge positions built up during the prior +8.18% surge were unwound at triple-witching, pressuring KOSPI large caps, while part of that capital rotated into KOSDAQ growth names — the -4.11% versus +3.01% gap captures the rotation directly.
The notable feature was the resilience of memory. SK Hynix closed +2.59% against a sharply falling index, a sign that HBM4 supercycle conviction survived the expiry selling, while Samsung fell only -1.16%, a quarter of the index's drop. Domestic and foreign profit-taking concentrated in non-semiconductor large caps rather than the chip twins.
The combined pattern implies today's drop was a technical give-back, not a structural exit. US overnight futures up about +0.6-0.9% are the leading indicator to watch tonight; if they hold, foreign chip buying could resume tomorrow once derivative flows settle.
| Investor | KOSPI Net | KOSDAQ Net | Trend |
|---|---|---|---|
| Foreigners | Net sell, large-cap | Net buy | Expiry-day profit-taking |
| Institutions | Net sell, program | Mixed | Triple-witching unwind |
| Retail | Mixed | Net buy | Rotating into KOSDAQ |
3. Korean Sector Breakdown: Today's Movers
The dominant theme was a split tape driven by triple-witching rather than fundamentals. Large-cap value and domestic heavyweights were hit by expiry program selling, while KOSDAQ growth and select internet names rose against the grain.
The leaders were memory and internet. SK Hynix (000660) gained +2.59%, climbing against a -4.11% index on intact HBM4 demand, and Kakao (035720) rose +3.01% in step with KOSDAQ strength. These moves show the decline was not a sector collapse.
The laggards were expiry-pressured large caps. NAVER (035420) fell -1.32%, diverging from Kakao within the internet group, while Samsung Electronics (005930) slipped -1.16%, Hyundai Motor (005380) -0.83%, and LG Energy Solution (373220) -0.26%. The key tomorrow is whether foreign buyers return to the chip twins now that expiry flows have cleared.
| Sector | Direction | Key Stock | Change | Reason |
|---|---|---|---|---|
| Semiconductors | ▲ Strong | SK Hynix (000660) | +2.59% | HBM4 conviction held |
| Internet | ▲ Strong | Kakao (035720) | +3.01% | KOSDAQ growth rotation |
| Semiconductors | ▼ Weak | Samsung (005930) | -1.16% | Expiry profit-taking |
| Internet | ▼ Weak | NAVER (035420) | -1.32% | Large-cap unwind |
| Autos | ▼ Weak | Hyundai (005380) | -0.83% | Risk-off large-cap |
4. Korean Stocks on My Radar
Prices below are the latest US close (June 10, local); the US June 11 session had not opened at Korea's close. Facts only, no buy/sell advice.
| Ticker | Price | Session % | Key Event |
|---|---|---|---|
| BMNR | $15.64 | -3.46% | Crypto risk-off; ~$9.6B in ETH/BTC/cash as of June 7 |
| SMCI | $29.27 | -27.98% | $7B equity raise to fund $39B AI-server backlog; dilution overhang |
| ASTS | $87.32 | -1.57% | BlueBird 8/9/10 launch set for June 17 from Cape Canaveral |
| POET | $10.98 | +1.90% | Lone gainer; Lumilens AI-photonics deal and $400M raise |
| RBLX | $41.50 | -3.49% | Russia lifted its Roblox ban; class-action suit overhang |
SMCI remains parked at its -27.98% level after announcing a roughly $7B equity and equity-linked financing to fund a $39B AI-server backlog; dilution fears still outweigh the demand signal, with an 18-analyst average target of $37.63.
RBLX closed -3.49% but picked up a fresh catalyst as Russia lifted its ban on Roblox, resuming the platform locally, though a shareholder class-action suit remains an overhang. POET rose +1.90%, the lone gainer, on its Lumilens AI-photonics supply deal and a $400M raise.
BMNR slipped -3.46% on crypto risk-off while holding about $9.6 billion in Ethereum, Bitcoin and cash as of June 7. ASTS held up best at -1.57% ahead of its June 17 BlueBird 8/9/10 launch from Cape Canaveral, though Barclays cut its target to $60 from $65 with an underweight rating.
5. KOSPI Tomorrow: Korean Market Outlook for Next Session
This is the most important section for PM readers. After a -4.11% expiry-day drop, the KOSPI faces a setup where US overnight futures are pointing higher — Nasdaq futures +0.93% to 28,819.00, S&P 500 futures +0.62% to 7,323.50, Dow futures +0.58% to 50,279.00. That divergence — Korea down alone while US futures recover — raises the odds of a gap-up attempt at tomorrow's open.
The key after-hours event tonight is Adobe's fiscal Q2 report after the US close, with consensus near $5.81 EPS on about $6.45B revenue. A clean print could rewarm AI-software sentiment and give Samsung Electronics (005930) and SK Hynix (000660) a reason to gap up, while a miss could reignite AI-capex fatigue and pressure Korean chips again.
On macro, US yields eased — the 10-year fell to 4.53% (-0.53%) — and oil cooled to WTI $90.37, relieving the inflation scare that drove yesterday's rout. The VIX at 21.25 is elevated but not panicked, leaving risk appetite cautious rather than fearful into tomorrow.
| Scenario | Trigger Condition | KOSPI Target |
|---|---|---|
| Bull | Nasdaq futures hold +0.5%+, Adobe beats, foreign chip buying resumes | Reclaims 7,800+ |
| Neutral | Adobe in line, expiry flows fade, memory holds | 7,700-7,900 range |
| Bear | Adobe misses or AI-capex fatigue returns, foreign selling persists | Tests 7,700 support |
Base case is a partial rebound that digests today's expiry shock as US futures lend support, capped until Adobe and foreign flows confirm direction. International readers without KRX access can track the move via the EWY (iShares MSCI South Korea ETF) or Samsung Electronics GDRs.
Today was not the day the supercycle broke; it was the day the calendar broke the index. The one line that tells tomorrow's story is SK Hynix closing green while the KOSPI bled.
So — where does this leave us going into tomorrow?
That's the PM breakdown for June 11, 2026. Trade safe.
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