Dow -1.21% Snaps 9-Day Streak Yet SOX +1.39% Diverges — Memory Decouples
Hey, Dongchun here.
KOSPI and KOSDAQ open on June 04, 2026 after US markets closed with Nasdaq -0.89% and S&P 500 -0.74%. Here is the Korean stock market preview for foreign investors.
The single most important fact today is that every major US index fell while the semiconductor SOX index rose +1.39% alone. Why it matters: Nvidia and Microsoft both dropped more than 3% in a broad selloff, but memory chips decoupled and held the chip complex up on supercycle demand. Watch whether that decoupling carries into Samsung Electronics when Korea reopens, or whether the oil, yield, and FX drag pulls foreigners out first.
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1. US Market Close: Impact on Korean Stocks
US stocks fell broadly on June 3, snapping the S&P 500's nine-day winning streak. The S&P 500 dropped -0.74% to 7,553.68, the Nasdaq -0.89% to 26,853.98, the Dow -1.21% to 50,687.07, and the Russell 2000 -1.31% to 2,893.51. The pullback came after a record-chasing run that had stretched valuations.
The single biggest catalyst was renewed US-Iran tension. New strikes between the two sides revived supply-disruption fears, lifting WTI +1.82% to $95.47 and pushing the 10-year Treasury yield to 4.49% (+0.81%). Higher oil and yields together pressured equities.
Breadth was weak but split. Mega-cap tech led the drop — Nvidia and Microsoft both fell more than 3% — while the Russell 2000's -1.31% showed small-caps hit hardest by rising rates. VIX rose +1.84% to 16.06, still calm but ticking up.
The one exception was semiconductors. The SOX index gained +1.39% to 13,916.96, decoupling from the broad selloff on memory-supercycle demand. That divergence is directly supportive for Samsung Electronics and SK Hynix at the Korea open.
| Index | Close | Change |
|---|---|---|
| S&P 500 | 7,553.68 | -0.74% |
| Nasdaq | 26,853.98 | -0.89% |
| Dow Jones | 50,687.07 | -1.21% |
| Russell 2000 | 2,893.51 | -1.31% |
2. KOSPI and KOSDAQ Today: Korean Market Opening Outlook
Korea's last session was June 2; June 3 was a local-election holiday, so today is the first reopening in two days. KOSPI closed +0.15% at a record 8,801.49 while KOSDAQ fell -2.29% to 1,026.03 — a split between record-chasing large-caps and sold-off small-caps.
In that session foreigners dumped a net 8.1 trillion won on KOSPI while retail investors absorbed almost the exact mirror image at +8.2 trillion won. Institutions were flat at -100 billion won. Samsung Electronics rose +3.30% to a record 360,500 won, though SK Hynix slipped -0.13%.
The combined flow leaves the reopening hostage to whether retail can keep absorbing foreign supply, now against a US selloff and USD/KRW at 1,516.60. Foreign direction in Samsung at the open is the cleanest tell.
| Index | Prev Close | Change | Key Level |
|---|---|---|---|
| KOSPI | 8,801.49 | +0.15% | 8,650 support |
| KOSDAQ | 1,026.03 | -2.29% | 1,000 support |
| Investor | KOSPI Net | KOSDAQ Net | Trend |
|---|---|---|---|
| Foreigners | -8,100 B KRW | Net selling | 100T+ won YTD exodus |
| Institutions | -100 B KRW | Mixed | Flat |
| Retail | +8,200 B KRW | Net buying | Sole index defender |
3. Korean Sector Breakdown: What is Moving Today
The dominant US theme was a broad risk-off led by mega-cap tech, with energy the only relative haven on the oil bounce. Nvidia and Microsoft both fell more than 3%, dragging tech, communications, cyclicals, and financials lower.
For Korea, the top read-through is semiconductors via memory. SOX +1.39% and the HBM supercycle support Samsung Electronics (005930) +3.30% and SK Hynix (000660) -0.13%, with memory demand booked out through 2027–2028. Internet also held firm, with NAVER +3.31%.
The laggards are cyclicals and batteries. Autos and 2차전지 fell in the prior session — Hyundai Motor (005380) -2.80% and LG Energy Solution (373220) -2.75% — and rising oil and yields keep pressure on rate-sensitive groups.
| Sector | US Session | Korea Stock | Korea Move | Watch |
|---|---|---|---|---|
| Semiconductors | ▲ SOX +1.39% | Samsung (005930), SK Hynix (000660) | +3.30% / -0.13% | KODEX Semiconductor |
| Internet | ▼ Mega-cap weak | NAVER (035420) | +3.31% | Platform names |
| Autos | ▼ Risk-off | Hyundai (005380) | -2.80% | Export margins |
| 2차전지 | ▼ Weak | LG Energy (373220) | -2.75% | TIGER 2차전지 |
4. Korean Stocks on My Radar
| Ticker | Price | Session % | Key Event |
|---|---|---|---|
| BMNR | $16.90 | -5.95% | ETH-treasury play pulls back with crypto despite 5.42M ETH / $11.6B holdings |
| SMCI | $47.42 | -5.48% | High-beta AI-server name falls with tech selloff; Mizuho target $44 caps it |
| ASTS | $107.73 | -8.83% | Deutsche Bank cut to Hold, target $117→$106; space-sector weakness persists |
| POET | $15.38 | +11.29% | AI optical-interconnect/photonics momentum extends post-Lumilens |
| RBLX | $43.68 | -2.93% | Full-year bookings guidance cut on age-verification drag still weighs |
POET +11.29% was the standout, as the AI optical-interconnect and photonics theme kept the high-beta small-cap running even on a down tape. ASTS -8.83% fell hardest after Deutsche Bank downgraded it to Hold and cut its target to $106 amid lingering space-sector profit-taking.
SMCI -5.48% and BMNR -5.95% slid with the broad tech and crypto selloff. RBLX -2.93% remained pressured by its earlier full-year bookings guidance cut tied to age-verification headwinds.
5. Earnings Watch
Earnings matter today because the AI-chip bellwether Broadcom reported after the June 3 close, and its read-through runs straight into Korean memory names.
| Company | EPS Est | EPS Actual | Rev Est | Rev Actual | Result | After-Hours |
|---|---|---|---|---|---|---|
| Broadcom | $2.40 | $2.44 | $22.27B | $22.19B | EPS beat, revenue slight miss | -8% |
Broadcom beat on EPS and guided Q3 revenue to roughly $29.4 billion (+84% YoY), with AI revenue up 143% to $10.8 billion and seen rising to $16 billion next quarter. Yet the stock fell more than 8% after hours in a classic buy-the-rumor, sell-the-news move after a five-day pre-earnings run-up. CrowdStrike also beat at $1.10 EPS versus $0.88 and announced a 4-for-1 split, but still dropped about 9%.
Tonight brings no major chip or big-tech release; Lululemon (after close, consensus EPS ~$1.67) has limited Korea linkage.
The Korea read-through is two-sided. Broadcom's $16 billion AI guidance signals AI infrastructure capex keeps expanding, which is constructive for HBM and memory demand at Samsung Electronics (005930) and SK Hynix (000660). But beats met by selling flag stretched expectations across high-valuation AI names, a near-term volatility risk.
6. How to Trade KOSPI Today: Setup and Levels
KOSPI's reopening leans lower. US overnight futures are soft (Nasdaq -0.98%, S&P -1.17%), and the two-day gap must absorb the broad US selloff plus Broadcom's 8% after-hours drop. The primary driver is risk-off from rising oil and yields.
The single most important indicator to watch is foreigners' net buy/sell in Samsung Electronics (005930) in the first five minutes of the 9:00 AM KST open. Samsung flow leads KOSPI direction because foreign positioning in the largest cap sets the tone for the whole index, and USD/KRW at 1,516.60 raises the bar for foreign buying.
Two sectors to focus on: semiconductors via Samsung Electronics (005930) and SK Hynix (000660) on the SOX +1.39% memory decoupling, and refiners on the WTI +1.82% bounce, against caution in autos and batteries.
| Scenario | Trigger Condition | KOSPI Target |
|---|---|---|
| Bull | Foreign net buy in Samsung, memory decoupling holds, oil stabilizes | Retests 8,850 |
| Neutral | Futures weakness absorbed, foreigners wait, chips vs cyclicals tug-of-war | 8,650–8,800 range |
| Bear | Gap-down on soft futures, USD/KRW breaks 1,520, foreign selling accelerates | 8,500 support test |
Base case: KOSPI trades the 8,650–8,800 lane, with the Samsung foreign-flow signal and the oil/FX combination as the two binary inputs in the first session after the election break. International readers without KRX access can track Korea exposure via EWY (iShares MSCI Korea ETF) or the Samsung Electronics GDR.
Indexes fell across the board while chips stood alone, held up by memory in the middle of an oil-and-yield-driven selloff. Read the decoupling, not the headline drop.
So — which way does Korea swing at the open today?
That's the AM breakdown for June 04, 2026. Trade safe.
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