US stocks plunged Friday May 15 with the S&P 500 -1.24% | Nasdaq -1.54%, S&P -1.24% — Korea Open Preview 26/05/16
Hey, Dongchun here.
The single fact that defines today is that the Trump-Xi summit ended empty-handed and dragged every major US index lower while SOX cratered -4.02%, the worst day for semiconductors since March 30. The 10-year Treasury yield jumping to 4.60% and the 30-year clearing 5.13% mean inflation, war and fiscal pressure are all pricing into bonds simultaneously, and risk assets including stocks, bitcoin, gold and copper sold off together. Watch whether the foreign-selling streak extends to an eighth consecutive session on Monday and whether USD/KRW finally breaks the 1,500 level — that single FX threshold decides if Korea sees forced foreign outflows accelerate further.
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1. US Session Recap
The S&P 500 closed at 7,408.50, down -1.24%, while the Nasdaq Composite slid -1.54% to 26,225.14 and the Dow Jones Industrial Average dropped -1.07% to 49,526.17. Russell 2000 led losers at -2.44% to 2,793.30, signaling small-cap distress on a rate-sensitive day.
The single biggest catalyst was the Trump-Xi summit producing no concrete deliverables beyond a Boeing 200-plane order, far below the 500-plane figure pre-summit briefings had hinted at. Wall Street read it as nothing of substance, and the move was amplified by the 10-year Treasury yield spiking to 4.60% and the 30-year clearing 5.13%.
Breadth was decisively negative. VIX rose +6.78% to 18.43, the SOX semiconductor index fell -4.02% in the worst session since March 30 with Intel -6%, AMD -5.7%, Micron -6.6% and Nvidia -4.4%, and gold/silver/copper all sold off together — a sign of broad liquidity compression rather than a simple safe-haven rotation.
For Korea, the implication is direct: foreign selling in Samsung Electronics and SK Hynix is likely to extend into an eighth session at Monday's open, oil-heavy names face mixed signals as Brent +3.33% but copper -4.23%, and battery/auto-supplier complexes face pressure from industrial-metal weakness.
| Index | Close | Change |
|---|---|---|
| S&P 500 | 7,408.50 | -1.24% |
| Nasdaq | 26,225.14 | -1.54% |
| Dow Jones | 49,526.17 | -1.07% |
| Russell 2000 | 2,793.30 | -2.44% |
2. Korea Market Snapshot
Korea is closed for the weekend, so the relevant snapshot is the prior session: KOSPI 7,493.18 (-6.12%) and KOSDAQ 1,129.82 (-5.14%) after an intraday record print of 8,046.78 collapsed by 553 points. The May 15 session triggered the year's 16th sell-side sidecar at 1:28 p.m.
Foreign investors net sold KRW 5.56 trillion on the KOSPI Friday — a seventh consecutive session of selling — with May cumulative outflows of KRW 6.4 trillion from SK Hynix and KRW 5.5 trillion from Samsung Electronics. Institutions added KRW 1.74 trillion of net sales while retail absorbed KRW 7.2 trillion on the buy side.
The combined flow pattern points to continued pressure into Monday's open. With US futures weak and USD/KRW near 1,500, the leading indicator to watch is whether the foreign-selling streak extends to an eighth session at the 9:00–9:05 AM KST open.
| Index | Prev Close | Change | Key Level |
|---|---|---|---|
| KOSPI | 7,493.18 | -6.12% | 7,300 support test on gap-down |
| KOSDAQ | 1,129.82 | -5.14% | 1,100 psychological line |
| Investor | KOSPI Net | KOSDAQ Net | Trend |
|---|---|---|---|
| Foreigners | -5,560 B KRW | Net seller | 7-session streak |
| Institutions | -1,740 B KRW | Net seller | Joining foreigners |
| Retail | +7,200 B KRW | Net buyer | Heavy dip-buying |
3. Korea Sector Breakdown
The dominant US theme was a synchronous risk-off across rate-sensitive and AI-leveraged sectors, triggered by the Trump-Xi summit disappointment and a 10-year yield spike to 4.60%. Profit-taking after a multi-week AI rally amplified the move.
For Korea, the two laggard groups to watch Monday are semiconductors and batteries. Samsung Electronics (005930) and SK Hynix (000660), already down -8.61% and -7.66% Friday, face direct SOX -4.02% read-through; LG Energy Solution (373220) faces copper -4.23% drag plus residual EPS-miss pressure.
The two potential outperformers are refiners and select shipping. SK Innovation and S-Oil benefit from Brent +3.33% to $109.24, while names like Heung-A Shipping that bid Friday on sector-specific flows could see continuation if oil holds.
| Sector | US Session | Korea Stock | Korea Move | Watch |
|---|---|---|---|---|
| Semiconductors | ▼ SOX -4.02% | Samsung (005930), SK Hynix (000660) | Gap-down risk | KODEX Semiconductor |
| Batteries | ▼ Copper -4.23% | LG Energy (373220) | Pressure | TIGER 2차전지 |
| Refining | ▲ Brent +3.33% | SK Innovation, S-Oil | Watch for bid | TIGER Oil&Gas |
| Internet | ▼ Nasdaq -1.54% | NAVER (035420), Kakao (035720) | Risk-off drag | KODEX 인터넷 |
4. Stocks on My Radar
| Ticker | Price | Session % | Key Event |
|---|---|---|---|
| BMNR | $19.87 | -9.68% | BTC/ETH retreat hits crypto-treasury NAV |
| SMCI | $31.04 | -6.02% | Goldman Sell rating; 27% customer concentration |
| ASTS | $83.67 | +0.80% | TELUS investment + 3 US gov contracts; NSR upgrade to Hold |
| POET | $15.97 | -22.36% | $400M direct offering dilution; profit-taking after +114% |
| RBLX | $42.85 | -1.99% | Piper Sandler downgrade; bookings guide cut -11% |
BMNR fell -9.68% as bitcoin retreated near $82k and ETH weakness pressured the company's crypto treasury NAV exposure. The 5.21M ETH holding and $13.4B total asset structure are intact, but short-term price action remains tied to crypto-asset levels.
SMCI dropped -6.02%, still digesting the May 5 Q1 revenue miss of $10.24B versus the $12.39B consensus. Goldman Sachs reiterated Sell on customer-concentration risk, with one data-center client driving 27% of quarterly revenue.
ASTS edged up +0.80% on TELUS strategic investment and three new US government prime-contractor wins. New Street Research upgraded to Hold; Bank of America flagged a 7-unit miss to the 2026 satellite target after BlueBird-7's launch failure.
POET crashed -22.36% after announcing a $400M direct offering of 19.05M shares plus warrants, slamming the recent +114% one-week move with dilution. Class-action lawsuits over the Marvell Celestial AI order cancellation remain in the background.
RBLX fell -1.99% on residual Piper Sandler downgrade impact, the 11% bookings-guidance cut and 25% adjusted-EBITDA guidance cut. Age-verification rollout continues to weigh on user engagement metrics.
5. Earnings Watch
Earnings matter today because Friday's POSCO Holdings beat is the only positive Korean print into a week-long stretch with no major large-cap reports until SK Holdings on May 21.
| Company | EPS Est | EPS Actual | Rev Est | Rev Actual | Result | After-Hours |
|---|---|---|---|---|---|---|
| POSCO Holdings | KRW 4,698 | KRW 6,178 | 미확인 | 미확인 | beat (+31.5%) | n/a |
The standout was POSCO Holdings beating consensus by +31.5%, supportive for the steel and materials complex though unlikely to override the broader macro risk-off into Monday.
| Company | Report Date | Consensus EPS | Watch For |
|---|---|---|---|
| SK Holdings (034730) | 2026-05-21 | KRW 11,019 | Refining/energy flow-through with Brent at $109 |
The Korea read-through is that index-level earnings catalysts are scarce this week, so macro and flow variables (USD/KRW, foreign selling, US yields) will decide direction until SK Holdings reports May 21.
6. Today's Trade Setup
The KOSPI is set up for a gap-down open on Monday May 18 driven by US futures at -1.3 to -1.7% and a fresh round of Treasury-yield stress. The primary driver is the Trump-Xi summit disappointment compounded by the 10-year yield jumping to 4.60%.
The single most important indicator to watch is foreign net flow in Samsung Electronics (005930) in the first five minutes (9:00–9:05 AM KST). Samsung-flow leads KOSPI direction because foreigners have been net sellers for seven straight sessions, with KRW 5.5T cumulative May outflow in Samsung alone — an eighth-session extension would signal forced rebalancing.
Two sectors deserve focus. Semiconductors — Samsung Electronics (005930), SK Hynix (000660) — will absorb SOX -4.02% read-through; refining and select energy names — SK Innovation (096770), S-Oil (010950) — could see flows on Brent at $109.24.
| Scenario | Trigger Condition | KOSPI Target |
|---|---|---|
| Bull | US futures recover toward -0.5% AND foreign selling pauses at session 7 | Reclaim 7,500 |
| Neutral | Futures stay -1.3% AND foreigners sell ~KRW 1–2T more | 7,300–7,500 range |
| Bear | USD/KRW breaks 1,500 AND Brent above $110 AND foreign net sell extends 8th session | Test below 7,300 |
The base case is a gap-down open Monday with 7,300 as the key support test. Readers without direct KRX access can track Korea exposure via EWY (iShares MSCI South Korea) or Samsung Electronics GDR.
The 4.60% yield and 5.13% long-bond print just liquidated risk-asset beta across the board. The only question into Monday's KOSPI open is whether USD/KRW finally cracks 1,500.
So — which way does Korea swing at the open today?
That's the AM breakdown for May 16. Trade safe.
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