# KOSPI Rockets Past 6,570 as AI Chip Euphoria Grips Seoul

By Abdullah Al Foysal · Finance · Published Wed, 12 Aug 2026 09:08:54 GMT · Updated Wed, 12 Aug 2026 15:08:54 GMT
Source: The Current Tribune — https://currenttribune.com/article/kospi-surges-6570-ai-chip-rally

The KOSPI’s latest surge wasn’t a grind higher. It was a vertical takeoff. South Korea’s main stock index ripped past the 6,570 line on August 12, powered by a ferocious rally in semiconductor and AI-related names that turned Seoul into one of the hottest markets on the planet for a day.

The benchmark KOSPI closed at 6,579.04, up 233.51 points, a 3.68% jump in a single session – a move big enough to trigger a rare buy sidecar, a mechanism that temporarily cools program buying when things overheat. At one point intraday, the index sprinted as high as 6,668.43 before late profit-taking knocked it back down to just above the 6,570 mark.

## KOSPI surge: a textbook AI and semiconductor wave

If you’re looking for a clean example of how the global AI boom is ricocheting through equity markets, this KOSPI surge is it. The immediate spark came from the United States: stronger-than-expected earnings and fresh orders from AI infrastructure companies lit a fire under Korean semiconductor American Depositary Receipts (ADRs) in New York, and that enthusiasm rolled straight into Seoul when markets opened.

The KOSPI started the day already hot, opening at 6,438.50 – nearly 93 points above the previous close – then spent the session grinding higher as foreign money poured in. By the close, overseas investors had snapped up more than 2.7 trillion won worth of KOSPI stocks, a massive net buying wave that effectively set the tone for the entire market.

Institutions jumped in behind them. Financial investment firms and private equity funds added more than 610 billion won in net purchases, amplifying the upside pressure and turning the market into a one-way trade for much of the day.

## Foreign capital piles into Korea’s AI chip champions

Beneath the index-level fireworks, this was a highly concentrated bet. The KOSPI’s breakout was led overwhelmingly by two semiconductor titans: Samsung Electronics and SK hynix. Foreign buyers zeroed in on these names as the core beneficiaries of a global buildout in AI data centers and high-performance computing.

Samsung Electronics finished at 255,500 won, jumping 6.68% on the day. The stock opened at 243,500 won and at one point was up more than 7% intraday as foreign orders kept hitting the tape. For a company of Samsung’s size, that’s not just a bounce – it’s a full-on re-rating in a single session.

SK hynix wasn’t far behind. The memory giant closed at 1,504,000 won, up 5.54%, punching decisively through the 1.5 million won threshold. Its ADRs had already climbed nearly 5% overnight in New York, and Seoul’s cash session simply finished what Wall Street started.

Zoom out and the pattern is clear: global investors are treating Korean chipmakers as direct leverage on AI demand. Strong earnings from AI infrastructure names in the US essentially acted as a proxy earnings surprise for Samsung and SK hynix, sparking what looked less like cautious positioning and more like a scramble not to miss the move.

## AI value chain lights up across the KOSPI

The rally didn’t stop at the chip fabs. Once the AI semiconductor trade was on, money flowed into the broader AI and electronics value chain, lifting a wide cast of beneficiaries.

SK Square, which holds a significant stake in SK hynix, rocketed 8.36% as investors re-priced the value of its holdings. LG Electronics surged 12.82%, helped by renewed focus on its AI data center cooling systems and vehicle component solutions businesses – areas that stand to benefit from more power-hungry computing infrastructure and smarter cars.

Other large-cap technology and battery plays moved in lockstep with the AI narrative:

- Samsung Electro-Mechanics jumped 5.78%.

- Samsung SDI advanced 5.66%.

- Samsung Electronics preference shares gained 3.27%.

- LG Energy Solution added 1.13%.

Further down the chain, companies tied to the physical backbone of the AI boom caught a strong bid. Iljin Electric soared 17.31%, and Daewon Cable climbed 10.40%, helped by expectations that expanding AI data centers will require heavy investment in power grid construction and cabling. The day’s performance looked less like a random rally and more like a market-wide attempt to reprice the entire AI and semiconductor ecosystem in Korea.

## Winners and losers: a brutal rotation underneath the rally

Every euphoric move has a flip side, and this one was no exception. While AI and semiconductor names ripped higher, money drained out of some of the previous darlings.

Biotech and finance were clear casualties. Samsung Biologics slid 3.73% as investors took profits and redirected capital toward the runaway AI trade. Major financials were also under modest pressure, with KB Financial Group down 0.36% and Shinhan Financial Group off 0.67%. HD Hyundai Heavy Industries slipped 1.39%.

The rotation was sharp, not gentle. Capital crowded into a few high-conviction themes – AI chips, power infrastructure, and related electronics – and abandoned sectors that had previously led the market. That kind of extreme concentration raises a natural question for investors: is this a sustainable repricing of Korea’s role in the AI economy, or just a crowded momentum trade that will snap back the moment US headlines cool?

## Retail investors cash out as institutions take over

Another striking feature of the rally was who was doing the buying. While foreigners and institutions were in full risk-on mode, domestic individual investors chose the opposite side of the trade.

On the KOSPI, individuals unloaded more than 3.17 trillion won worth of shares on August 12 alone. In effect, they sold the rally to foreigners and institutions, using the index’s surge as an opportunity to lock in gains. That transfer of supply was a big reason the KOSPI could run as far as it did without running out of sellers.

The KOSDAQ told a different story. There, foreigners and institutions were net sellers – offloading 162.2 billion won and 147.6 billion won respectively – while retail traders stepped in to buy. Individuals picked up 314.9 billion won in net purchases, helping the KOSDAQ reverse an early dip and close slightly higher at 858.91, up 0.12%.

The split underscores how differently investors are viewing the two markets. The KOSPI has become the institutional and foreign vehicle for expressing big AI and semiconductor bets, while the KOSDAQ is still where domestic traders look for growth stories and tactical opportunities.

![Traders watch KOSPI surge and steady won-dollar exchange rate on Seoul dealing room screens](/media/2026/08/kospi-surges-6570-ai-chip-rally-inline.webp)
*Traders in Seoul monitor the KOSPI surge as the won-dollar exchange rate holds steady in the background.*

## Currency backdrop: a calm won as equities roar

All of this unfolded against a surprisingly steady currency backdrop. In the Seoul foreign exchange market, the won-dollar exchange rate closed at 1,415.7 won per dollar, down 0.3 won from the previous daytime close.

That tiny move – effectively flat – sends an important signal. Despite a roaring equity session and a tidal wave of foreign inflows into Korean stocks, the currency market stayed calm. Traders were still in wait-and-see mode ahead of the US July Consumer Price Index (CPI) release and were also weighing geopolitical risks, but there was no sign of panic or disorderly moves.

A steady won matters for the KOSPI. It makes foreign inflows stickier by reducing currency risk, and it helps Korean exporters, including chipmakers, avoid the worst of FX volatility even as global demand for AI hardware remains the main driver for earnings expectations.

## How fragile is this AI-fueled KOSPI rally?

Strip away the ticker tape, and the August 12 session is a snapshot of where markets are psychologically right now: utterly fixated on AI and willing to overlook almost everything else, at least for a day.

There are a few takeaways for anyone trying to make sense of the KOSPI surge:

- **It’s global, not local.** The key catalyst was US earnings from AI infrastructure companies and the reaction in New York trading of Korean semiconductor ADRs. Seoul’s move was downstream of that.

- **It’s highly concentrated.** Samsung Electronics and SK hynix did outsized heavy lifting. When a small group of names drive outsized index gains, volatility tends to rise.

- **Retail and foreign investors are on opposite sides.** Individuals took money off the table just as global funds rushed in. One of those groups will eventually be proven right on timing.

- **The macro overlay hasn’t gone away.** The US CPI print and ongoing geopolitical tensions still loom over risk assets, even if they were background noise during this particular melt-up.

For Korea, though, there’s a bigger structural story underneath the daily price moves. Global investors are increasingly treating the country as a core part of the AI supply chain – not just as a cyclical memory play, but as a foundational hub for chips, batteries, power equipment, and electronics that feed the data center buildout.

## What This Means

The KOSPI’s charge past 6,570 on the back of an AI and semiconductor wave is more than just a flashy number on an electronic board. It’s a signal that Korea’s equity market is becoming one of the purest public-market expressions of the global AI trade.

If robust AI-related earnings in the US continue, it’s hard to see foreign appetite for Korean chipmakers fading quickly. Stronger global demand for AI infrastructure would keep the focus on names like Samsung Electronics, SK hynix, and the broader AI value chain that rallied so fiercely on August 12.

The risk is that this excitement has become tightly tethered to a single theme. A disappointment in AI spending, a negative surprise in US data, or a sharp shift in risk sentiment could reverse flows just as fast as they arrived. For now, though, the message from the market is blunt: when AI is winning, the KOSPI – and especially its semiconductor heavyweights – are where global investors want to be.

*Photo: 밥풀떼기 / BY-SA via Openverse*