Seoul — July 27, 2026. Published after the market close; prices are official closing values.
The 30-second version
- KOSPI closed at 6,755.75, up 0.97%, reclaiming the 6,700 line after Friday’s 5.72% drop. KOSDAQ jumped 2.22% to 764.86.
- Two tailwinds: WTI crude fell 6.30% to $83.68 as US-Iran tensions eased, and post-“San Francisco AI Summit” optimism lifted Korean AI plays.
- NAVER surged 8.43% after securing an investment from Nvidia; Samsung SDS rose 3.82% on hopes tied to cooperation with Anthropic.
- Foreign investors sold a net KRW 2.885 trillion (~$2.0B) of KOSPI shares today; individuals and institutions absorbed the supply.
- July remains historically volatile — daily swings of -8.95% to +6.24% this month, with repeated “sidecar” trading curbs.
A relief rally, with a large asterisk
Monday’s bounce was driven mostly by what happened outside Korea. WTI crude slid 6.30% to $83.68 as geopolitical risk between the US and Iran eased — a direct positive for Korea, a major energy importer. The VIX, Wall Street’s fear gauge, fell 5.11% to 17.63. Add renewed enthusiasm for Korean companies seen as beneficiaries of AI partnerships announced around the San Francisco AI Summit, and buyers had reasons to step back in.
The asterisk: foreign investors were heavy sellers, dumping a net KRW 2.885 trillion (~$2.0 billion at today’s rate) of KOSPI shares in what local coverage described as large-scale profit-taking. Part of the pressure was attributed to a supply shock from the stock-market listing of CXMT, a Chinese memory-chip maker, which pulled some global semiconductor money toward the new issue. Domestic buyers filled the gap — individuals bought a net KRW 1.98 trillion and institutions KRW 862.3 billion on KOSPI — which capped the damage but also capped the upside.
Notably, Seoul shrugged off an ugly overnight setup. In Friday’s US session, the Philadelphia Semiconductor Index fell 4.25% and the iShares MSCI South Korea ETF (EWY) — a US-listed proxy for Korean equities, reflecting the prior session rather than today’s Seoul trading — dropped 6.27%. Monday’s rebound suggests much of that gloom was already priced into Friday’s Seoul selloff.
AI headlines did the heavy lifting
The single biggest story was NAVER, Korea’s dominant search and internet platform, which soared 8.43% to KRW 225,000 after news that it had attracted an investment from Nvidia. Samsung SDS gained 3.82% on expectations around cooperation with Anthropic. The two chip heavyweights recovered from Friday’s rout: Samsung Electronics rose 1.80% to KRW 254,000 and SK hynix climbed 3.24% to KRW 1,816,000.
Sector data (based on KODEX sector-ETF proxies, which can deviate slightly from official indices) showed five of eight sectors advancing: semiconductors +3.08%, bio +1.86%, and banks +1.67% led, while steel (-0.41%), autos (-0.32%) and construction (-0.24%) lagged. On KOSDAQ, Alteogen (+3.83%), Rainbow Robotics (+5.50%) and Jusung Engineering (+6.31%) all rallied.
On the disclosure front, Industrial Bank of Korea filed preliminary consolidated earnings, iM Financial Group posted preliminary results, and KR Motors disclosed a merger decision.
A rollercoaster July — and cautious money on the sidelines
Context matters here. The KOSPI has swung violently this month: -8.95% on July 13, +6.24% on July 15, -6.37% the next day, -4.46% on July 20, +4.40% on July 23, then -5.72% last Friday. Local reports note that “sidecar” curbs have been triggered repeatedly. A sidecar is a five-minute pause on program-trading orders that kicks in when index futures move sharply — think of it as a speed bump that forces algorithmic traders to slow down before momentum feeds on itself.
The positioning data explains the nervousness. As of July 23, investor deposits — cash sitting in brokerage accounts waiting to be deployed — stood at KRW 104.3 trillion (~$71 billion), and margin loans, a gauge of retail leverage, at KRW 32.7 trillion (~$22 billion). In the previous session (July 24, the latest published full breakdown, covering KOSPI and KOSDAQ combined), foreign investors net sold KRW 3.27 trillion while individuals net bought KRW 5.18 trillion. Even so, foreigners’ five-day cumulative flow remains positive at KRW +2.30 trillion — this is choppy, tactical trading, not a one-way exit.
Key closing numbers
| Item | Close | Change |
|---|---|---|
| KOSPI | 6,755.75 | +0.97% |
| KOSDAQ | 764.86 | +2.22% |
| USD/KRW (Seoul daytime close) | 1,468.8 | won stronger on the day |
| WTI crude | $83.68 | -6.30% |
| VIX | 17.63 | -5.11% |
| Samsung Electronics | KRW 254,000 | +1.80% |
| SK hynix | KRW 1,816,000 | +3.24% |
| NAVER | KRW 225,000 | +8.43% |
| Foreign net flow (KOSPI, today) | KRW -2.885T (~-$2.0B) | net selling |
Note: the global 24-hour FX feed printed USD/KRW at 1,467.63 (-0.43%); the official Seoul daytime session closed at 1,468.8 — small differences between the two are normal.
What to watch next
- Korea customs 10-day trade data (around August 1): the flash export read is the most timely pulse on chip demand and will test the AI-optimism narrative.
- Foreign flows: whether today’s KRW 2.885 trillion KOSPI sale extends into a trend or reverses, as the still-positive five-day figure suggests it might.
- Volatility regime: whether the market can string together calm sessions after a month of sidecar-triggering swings.
- CXMT-related rotation: further supply pressure on Korean memory names as global funds digest the new Chinese listing.
FAQ
Why did the Korean stock market go up on July 27, 2026?
Two main reasons: oil prices fell sharply (WTI -6.30%) as US-Iran tensions eased, cutting a key cost for import-dependent Korea, and AI-partnership news — led by Nvidia’s investment in NAVER — revived appetite for Korean tech. Domestic buying offset roughly $2.0 billion of foreign selling.
Why did NAVER stock jump more than 8%?
NAVER rose 8.43% to KRW 225,000 after news it secured an investment from Nvidia, positioning Korea’s largest internet platform more firmly in the global AI buildout.
What is a sidecar in the Korean stock market?
A sidecar is an automatic five-minute halt on program-trading orders triggered by sharp moves in index futures. It is a milder cousin of the circuit breaker (which halts the entire market) and has been triggered repeatedly during July’s extreme swings.
Are foreign investors abandoning Korean stocks?
Not clearly. They sold heavily today and in the prior session, but their five-day cumulative flow was still a net purchase of KRW 2.30 trillion — a pattern that looks like fast-moving tactical trading around volatility rather than a structural exit.
Disclaimer: This is an information and analysis publication, not investment advice. See our Methodology for data sources, standards, and our corrections policy.