The Financial Times noted recently that the speed of Korea's rally has outpaced even the U.S. Nasdaq's climb during the late-1990s dotcom boom. The benchmark KOSPI has tripled in roughly 18 months, breaking through 7,200 after starting last year near 2,400. That ascent is steeper, by the FT's measure, than the comparable stretch of Nasdaq's bubble-era run.
At the heart of the rally sit Samsung Electronics and SK hynix. The artificial intelligence build-out, surging global data center CAPEX, and a step-change in demand for high-bandwidth memory (HBM) have driven both companies to record earnings.
Samsung Electronics has gained about 130 percent this year. SK hynix is up close to 170 percent. Their combined market capitalization now exceeds South Korea's gross domestic product — a milestone with few, if any, precedents in the country's economic history.
But the hotter the market, the more valuable a cool head becomes.
As the FT pointed out, this rally differs from the dotcom episode in one important respect. Nasdaq in 1999 was driven by expectations and multiple expansion, not earnings. Korea's chip rally, by contrast, is being delivered alongside real profit growth. Analysts argue that the global AI infrastructure build is restructuring the memory industry itself.
That is why Goldman Sachs, JPMorgan and Citigroup have kept raising their KOSPI targets. Memory, long treated as a textbook cyclical, is increasingly being repriced as a structural growth industry inside the larger AI shift.
The problem is balance. Korea's rally is dangerously concentrated. Strip out Samsung and SK hynix and a large share of the market remains in the doldrums. Small- and mid-cap value names are being passed over by liquidity, and the real economy bears little resemblance to the euphoria on the tape.
In other words, what we are watching is not a broad-based rise in Korea Inc. so much as a hyper-concentrated rally in AI-linked semiconductors.
History rewards remembering. Markets overheat in optimism and then forget risk inside that overheating. Korea is also structurally retail-heavy: the so-called "ant army" of individual investors has been a defining force in this rally, with money once parked in U.S. equities flowing back into Samsung and SK hynix.
The worry is that margin debt — "bittu," money borrowed to chase the trade — is growing fast. During Korea's housing mania, people said "this time is different." The conviction that Seoul apartment prices could only rise pulled households into ever-larger loans, and ended in extreme volatility. Stocks are no different. Share prices reflect future cash flows, but markets never move in straight lines. The AI revolution is real; the corrections and drawdowns inside that revolution will be just as real.
Foreign flows deserve particular attention. The Korean market is structurally dependent on foreign capital, which provides powerful thrust on the way up but is also the first to leave when risk appetite turns. U.S. interest rate policy, a global growth slowdown, U.S.-China tensions, Taiwan Strait risk and the Middle East — any of these external variables can amplify Korean volatility at short notice.
In a market this concentrated in one sector and a handful of names, even a small shock can land outsized.
The deeper concern is that the psychology of the market is drifting from investing toward chasing. Once "if I don't buy now I'll be left behind" replaces cold analysis of earnings and industry change, the warning lights come on. The risk is sharpest when retail investors lever up to crowd into a narrow group of stocks.
And yet this rally cannot be dismissed as a simple bubble. Korean equities still trade cheaply against U.S. peers. Bloomberg data cited by the FT put the KOSPI's forward price-to-earnings ratio in the 8x range — less than half that of the S&P 500. Nearly half of listed Korean companies still trade below a price-to-book ratio of one. The country has not, in other words, fully escaped its structural discount.
What matters from here is direction. For Korea to graduate into a genuinely mature capital market, it cannot ride on two stocks alone. Small- and mid-caps, value names, biotech, robotics, defense, shipbuilding, content and software all need to participate. The market's overall fitness has to improve.
That is also why the government's corporate governance reforms and its low-PBR value-up program matter. Done well, they should raise trust in the capital market and strengthen the system as a whole.
Above all, what Korea needs now is a sense of balance. The AI revolution is opening a genuine era of industrial transformation, and Korea's semiconductor industry sits at its center. But every market mania casts a shadow.
Investors must price risk even when feeling optimistic.
Government must stress-test the system even in a bull market. Companies must build long-term competitiveness rather than get drunk on their share price.
The world is watching Korea's market. Whether this surge becomes the opening chapter of the country's industrial renaissance — or simply another entry in the ledger of extreme volatility — depends on the choices made from here.
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