KOSPI Forecast May 21, 2026: Nvidia posted a clean beat for Q1 FY27 (Nasdaq +1.54%, S&P +1.08%)
Hey, Dongchun here.
KOSPI and KOSDAQ open on May 21, 2026 after US markets closed with Nasdaq +1.54% and S&P 500 +1.08%. Here is the Korean stock market preview for foreign investors.
The single thing that mattered was that Nvidia beat on every line and still slid after hours. The regular session was a broad chip melt-up — SMCI +9.49%, AMD +8.1%, SOX +4.49% — fueled by hope into the print, while oil crashed 8% and yields fell, easing the macro. But a flawless beat that fails to lift the stock is the heavier signal.
Watch whether Samsung and SK Hynix shrug off the sell-the-news or follow it lower at the Korea open.
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1. US Market Close: Impact on Korean Stocks
US stocks snapped a three-day losing streak with a broad rally. The S&P 500 rose 1.08% to 7,432.97, the Nasdaq jumped 1.54% to 26,270.36, the Dow climbed 1.31% to 50,009.35 to reclaim 50,000, and the Russell 2000 led with +2.56% to 2,817.36. This was a market-wide advance, not a mega-cap-only move.
The single biggest catalyst was positioning into Nvidia's after-close earnings. AI hardware names surged in anticipation — SMCI +9.49%, AMD +8.1%, Intel +7.42% — pushing the SOX semiconductor index up 4.49%. A parallel 8% crash in WTI crude below $100, on hopes of an Iran deal reopening the Strait of Hormuz, eased inflation fears and pulled the 10-year yield down to 4.57%.
Breadth was strong. The Russell 2000's +2.56% outpaced the Nasdaq, signaling small-caps participated on falling rates, and VIX dropped 3.43% to 17.44, far from stress levels.
The Korea implication is direct but two-sided. Falling US yields and a softer dollar are friendly to Korean growth and chip names, but Nvidia's post-earnings slide threatens to cap the read-through for Samsung and SK Hynix.
| Index | Close | Change |
|---|---|---|
| S&P 500 | 7,432.97 | +1.08% |
| Nasdaq | 26,270.36 | +1.54% |
| Dow Jones | 50,009.35 | +1.31% |
| Russell 2000 | 2,817.36 | +2.56% |
2. KOSPI and KOSDAQ Today: Korean Market Opening Outlook
KOSPI fell 3.25% to 7,271.66 and KOSDAQ dropped 2.41% to 1,084.36. The decline came despite a strong US session and a stronger won, marking a sharp divergence from the friendly macro backdrop.
Nvidia's sell-the-news reaction appears to have weighed on Asian chip sentiment. A flawless beat that failed to lift the stock dampened risk appetite, and foreign profit-taking likely pressured the index broadly even as the won fell below 1,500.
The combined pattern points to caution at the next session's open. The key tell is whether foreigners reverse to buying on the improved FX and yield backdrop, or stay on the sidelines after the sell-the-news signal.
| Index | Prev Close | Change | Key Level |
|---|---|---|---|
| KOSPI | 7,271.66 | -3.25% | 7,200 support |
| KOSDAQ | 1,084.36 | -2.41% | 1,050 support |
| Investor | KOSPI Net | KOSDAQ Net | Trend |
|---|---|---|---|
| Foreigners | Net sell | Net sell | Sell-the-news profit-taking |
| Institutions | Mixed | Mixed | Selective defense |
| Retail | Net buy | Net buy | Continued dip-buying |
3. Korean Sector Breakdown: What is Moving Today
The dominant theme was a US chip melt-up into Nvidia's print, driven by AI-hardware demand hope plus a macro tailwind from crashing oil and falling yields.
In Korea, semiconductors were the lone holdouts. Samsung Electronics (005930) rose 0.18% and SK Hynix (000660) closed flat, defending against a broad index decline as the HBM demand narrative held.
The hardest-hit Korean sectors were batteries and internet. LG Energy Solution (373220) fell 3.88%, while NAVER (035420) dropped 3.33% and Kakao (035720) lost 3.49%; Hyundai (005380) eased 1.99% on lingering sector weakness.
| Sector | US Session | Korea Stock | Korea Move | Watch |
|---|---|---|---|---|
| Semiconductors | ▲ SOX +4.49% | Samsung (005930), SK Hynix (000660) | +0.18% / 0.00% | KODEX Semiconductor |
| 2차전지 | ▼ Mixed | LG Energy (373220) | -3.88% | TIGER 2차전지 |
| Internet | ▼ Weak | Kakao (035720) | -3.49% | NAVER (035420) |
| Auto | ▼ Weak | Hyundai (005380) | -1.99% | Kia (000270) |
4. Korean Stocks on My Radar
| Ticker | Price | Session % | Key Event |
|---|---|---|---|
| BMNR | $19.39 | +4.08% | Resale filing overhang, risk-on bounce |
| SMCI | $33.46 | +9.49% | Led AI-server rally into Nvidia print |
| ASTS | $89.58 | +1.68% | 45 BlueBird satellites targeted, $3.9B liquidity |
| POET | $14.78 | +13.08% | Lumilens $50M order, up to $500M optical-engine deal |
| RBLX | $45.79 | +3.01% | Strong Q1, up to $3B buyback |
BMNR rose 4.08% in a risk-on session, even as a share-resale filing tested the rally's strength.
SMCI surged 9.49%, leading the AI-server rally into Nvidia's report and outpacing Dell (+3%) and HPE (+2.5%) as the most volatile name in enterprise AI hardware.
ASTS gained 1.68%, supported by carrier-partnership momentum, a target of roughly 45 BlueBird satellites in orbit during 2026, and over $3.9B in liquidity.
POET jumped 13.08% after Lumilens placed a ~$50M initial order for Electrical-Optical Interposer engines, with potential to expand past $500M, though a ~$400M raise and class-action overhang keep volatility high.
RBLX rose 3.01% on solid Q1 revenue, bookings and free cash flow, with a buyback of up to $3B (up to $1B over 12 months) cushioning the earlier guidance-cut concern.
5. Earnings Watch
Earnings matter today because Nvidia's after-close print is the single tell for the entire Korean chip complex.
| Company | EPS Est | EPS Actual | Rev Est | Rev Actual | Result | After-Hours |
|---|---|---|---|---|---|---|
| Nvidia | $1.76 | $1.87 | $78.8B | $81.6B | beat, Q2 guide $91B above consensus | slid |
Nvidia beat on every line, with data-center revenue nearly doubling year-over-year and Q2 guidance of $91B well above the $86.84B consensus, yet the stock slid after the close because expectations were already elevated — a textbook sell-the-news.
Korea read-through: Nvidia's data-center strength reinforces SK Hynix's HBM demand narrative, but if the sell-the-news pattern persists, Samsung Electronics and SK Hynix could face profit-taking on already-priced-in optimism. The post-earnings reaction, more than the headline numbers, will shape the Korea open.
6. How to Trade KOSPI Today: Setup and Levels
US overnight futures are firm — S&P +0.57%, Nasdaq +0.93%, Dow +1.04% — and the macro backdrop turned friendly with the won below 1,500 and the 10-year yield down to 4.57%. That argues for a stabilization attempt, but the real driver is whether Nvidia's sell-the-news bleeds into Asian chip sentiment.
The single most important indicator is foreigners' net flow in Samsung Electronics (005930) at the 9:00–9:05 AM KST open. Samsung flow leads KOSPI direction because foreign chip positioning sets the tone for the entire index; a reversal to buying on the improved FX would be the cleanest bullish tell.
Two sectors to focus on are semiconductors — Samsung Electronics (005930) and SK Hynix (000660) on the Nvidia HBM read-through — and rate-sensitive growth names like NAVER (035420) that benefit from the sharp drop in US yields.
| Scenario | Trigger Condition | KOSPI Target |
|---|---|---|
| Bull | Nvidia sell-the-news contained + foreign chip buying resumes + won holds below 1,500 | rebound attempt |
| Neutral | Firm overnight futures + chips flat + foreigners on sidelines | partial recovery, range-bound |
| Bear | Sell-the-news spreads to Asia + foreign selling persists + batteries/internet weaken further | further downside |
Base case: a stabilization attempt off the sharp drop, resolved by whether foreigners buy chips on the friendlier FX and yield backdrop. For readers outside KRX, EWY (iShares MSCI South Korea ETF) and the Samsung GDR (005935.LSE) offer proxy exposure, but both carry the same Nvidia-reaction risk over the next 24 hours.
When perfect earnings can't move a stock, the market already knew. The reaction, not the number, sets tomorrow's tape.
So — which way does Korea swing at the open today?
That's the AM breakdown for May 21, 2026. Trade safe.
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