From an all-time high of 9,114 to two circuit breakers — KOSPI swung nearly 7% in a single week, Micron's earnings beat confirmed the memory supercycle, and the AI capital cycle kept flowing regardless of the short-term collapse
From an all-time high to two circuit breakers, KOSPI traced a 9,114 → 8,203 → 8,930 → 8,411 path — nearly a 7% round-trip across five days. At the epicenter, Micron confirmed the memory supercycle with a historic earnings beat (revenue $41.46B · EPS $25.11 · Q4 guide $50B · GM 86%), but that supercycle quickly issued its invoice to Apple and Microsoft in the form of product price hikes. Prices lurched violently; the underlying AI capital cycle did not stop. Memory concentration simply amplified the swings. The key questions for next week: will volatility settle, will June-end foreign rebalancing conclude, and will interest rates steer this capital cycle toward expansion or contraction?
Reader's Brief — 30-second TL;DR
Intermediate
Why Now
6/22 KOSPI 9,114 (+0.69%) first close above 9,100, all-time high, SK hynix takes the top market-cap spot for the first time in 25 years and 7 months, vs US big-tech AI talent exodus (Alphabet -6% · Nasdaq -1.32%) → 6/23 KOSPI -9.99% (8,203), a record 910-point drop, the year's fourth circuit breaker, Samsung Electronics and SK hynix each -12%, leveraged semiconductor ETF regulatory concerns, Korea again left off the MSCI DM watchlist, hawkish FOMC repricing cited by foreign media, global AI selloff (Nasdaq -2.21% · VIX +22.5%) → 6/24 Samsung Electronics +9.84% on 90-trillion-won buyback reports · KOSPI +3.26% (8,471) · Micron FQ3 earnings beat after the US close (after-hours +13%) → 6/25 KOSPI +5.42% (8,930) rebound · Apple -6.13% (memory-driven price hikes) → 6/26 KOSPI -5.81% (8,411), fifth circuit breaker of the year, foreign investors six consecutive net-selling sessions, OpenAI IPO delay reports.
Winners ?? Losers
Week's winners — Micron (earnings beat, memory supercycle quantified), the memory cycle itself (commodity DRAM margins 88–90% now inverting above HBM), Samsung Electronics (+9.84% rebound on buyback reports). Under pressure — KOSPI (7% round-trip, foreign investors six straight net-selling days), Apple (memory cost pass-through sent the stock -6%-plus, June-quarter GM guided to 47.5–48.5%), big-tech Mag 7 (Nasdaq weak for five consecutive sessions). Watch closely — whether volatility normalizes, June-end foreign rebalancing concluding, interest rate trajectory (the new key to AI capex), memory inflation spreading to more OEM product prices, OpenAI IPO delay (currently at the rumor stage).
Watch For
Reading depth
6/22 (Mon) — KOSPI 9,114, First Close Above 9,100, All-Time High; US Big-Tech AI Talent Exodus
The week opened at a record high. KOSPI closed at 9,114, clearing 9,100 for the first time and setting a new all-time high.
Korea at record highs, the US already shaken
Even with foreign investors selling roughly 2 trillion won worth of shares, the index advanced +0.69% (9,114.55) to a new record. The momentum concentrated in the memory pair — Samsung Electronics and SK hynix — absorbed the foreign selling. It was a narrow rally. That same day, SK hynix overtook Samsung Electronics as the largest company on the KOSPI by market capitalization for the first time in 25 years and 7 months — a symbolic marker of just how concentrated this rally had become in a single memory axis. The US told a different story. Big-tech talent concerns rattled sentiment. Reports that a DeepMind Nobel laureate-researcher was moving to Anthropic sent Alphabet down 6%, dragging Amazon, Meta, and Microsoft with it — Nasdaq closed -1.32% (26,166).
Macro gave a brief respite
Oil retreated. A US-Iran 60-day roadmap agreement eased supply fears, pushing WTI down -4.26% to $74. The Middle East geopolitical risk that had weighed on markets through 2025–26 stepped back for one . That said, a stronger dollar and continued foreign selling pushed USD/KRW above 1,530 (1,537), levels not seen in ten days. 6/22 was an asymmetric day — Korea wrote a historic record while the US began pricing in cracks in its most intangible asset: AI talent.
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This report is provided for informational purposes only and does not constitute a recommendation to buy or sell any financial instrument. Investment decisions should be made based on your own judgment and responsibility. The analysis and opinions contained herein are based on information available at the time of writing and are subject to change.