The Stock Market That Listens to One Man
There is a moment Korean traders know well. Jensen Huang steps onto a stage — Computex, GTC, a Seoul hotel ballroom — and before he finishes his sentence, the alerts start firing. SK Hynix climbs two percent. Hanmi Semiconductor hits a circuit limit. The KOSPI ticks upward, and somewhere in Seoul, a salaried office worker refreshing their brokerage app exhales slowly. The Nvidia effect is not a metaphor in South Korea. It is a measurable, repeatable, market-moving phenomenon — and understanding it means understanding why one American CEO has become the most influential figure in Korean retail investing.
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| One CEO. One approval. Trillions of won in motion — this is the Nvidia effect, Korean edition. |
As explored in Kkanbu and Hyungnim: How Jensen Huang Wins Korean Hearts, Jensen Huang's cultural hold on Korea runs deeper than a business partnership. But nowhere does that hold become more viscerally real than in the capital markets. This is the financial anatomy of the Gganbu alliance — and how a single CEO's approval has rewired the fortunes of Korean tech stocks, retail portfolios, and an entire semiconductor ecosystem.
SK Hynix: The Memory Giant on a Record Run
The numbers are extraordinary. In Q3 2025, SK Hynix reported an operating profit of ₩11.4 trillion — approximately $8 billion — a 62 percent jump year-on-year. Revenue climbed 39 percent to ₩22.4 trillion. The engine behind nearly all of it: high-bandwidth memory chips sold to Nvidia for AI data center GPUs. At peak, SK Hynix's stock had surged 122 percent, pushing its market capitalization to ₩422.2 trillion, roughly 73 percent of Samsung's. For a company that spent years in Samsung's shadow, that shift was seismic.
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| SK Hynix's record ₩11.4 trillion profit in Q3 2025 didn't happen by accident — it was engineered chip by chip, order by order, straight from Nvidia's data centers. |
The mechanics of this dominance are not complicated, but the scale is staggering. SK Hynix currently controls more than half of the global HBM market, with Samsung and Micron trailing at roughly 25 percent each. Its flagship 12-layer HBM3E — the chip that powers Nvidia's H100 and H200 GPU families — has been so comprehensively ordered that the company effectively sold out its entire DRAM, NAND, and HBM production capacity for 2026 before mid-year. Every unit, already spoken for. "We will finalize discussions with customers about next year's HBM supply volume within the first half of this year," CEO Kwak Noh-jung told shareholders, a statement that barely captures how thoroughly the company's output is locked to Nvidia's roadmap.
The pricing dynamics are just as telling. Samsung and SK Hynix raised HBM3E supply prices by nearly 20 percent for 2026 — an increase described as unusual even by industry standards. In a market where memory prices historically soften as competition ramps up, the Nvidia demand signal has proven strong enough to reverse that gravity entirely. Looking ahead, UBS projects SK Hynix will capture approximately 70 percent of the HBM4 market for Nvidia's next-generation Rubin platform, expected in the second half of 2026. The gganbu relationship, it seems, only deepens with each product generation.
Hanmi Semiconductor: The Kingmaker Nobody Talks About
If SK Hynix is the headline act, Hanmi Semiconductor is the instrument maker who built the stage. Based in Incheon, the company manufactures TC Bonders — thermal compression bonding machines that physically stack memory dies with the precision required for HBM architecture. Without them, HBM4 cannot exist. Hanmi holds a dominant position in this niche, with its TC Bonders holding commanding market share in HBM3E packaging equipment globally.
The market has priced in that criticality. As of June 4, 2026, Hanmi Semiconductor's stock traded at ₩304,000, reflecting a market capitalization of approximately $28.8 billion — a figure that represents a remarkable transformation from its 52-week low of ₩81,300. The company has set its 2026 revenue target at 2 trillion won, up from 650 billion won just two years earlier. It is now establishing a U.S. subsidiary — HANMI USA — in San Jose by end of 2026, positioning itself to serve Nvidia's supply chain partners directly on American soil. Chairman Kwak Dong-shin described TC Bonder orders as concentrating heavily in the second quarter of 2026 as HBM4 mass production gains momentum. For a company that most global investors have never heard of, its financial trajectory reads like a Nvidia proxy.
The Retail Force: Korea's AI Investing Army
The professional investment story is compelling enough. But the retail dimension is where the Nvidia effect in Korea becomes genuinely extraordinary. Korean individual investors — known as seohak gaemi, or "overseas stock ants," when investing in foreign markets — have collectively embraced Nvidia with the intensity of a cultural movement. During the Chuseok holiday week in October 2025, with domestic markets closed, Korean retail investors poured $1.24 billion into overseas investments in a matter of days, targeting U.S. tech stocks and leveraged semiconductor ETFs at the top of their lists.
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| Inside every Nvidia GPU sits Korean memory, assembled by Korean machines, financed in part by Korean retail investors who bet early and bet big. |
Nvidia sat at the apex of that list, alongside the Direxion Daily Semiconductor Bull 3X ETF. The depth of retail conviction was quantifiable: Korea Investment Corporation, the country's sovereign wealth fund, held Nvidia as its second-largest individual position as of early 2025. Meanwhile, individual brokerage data showed Nvidia as the single most-held overseas stock across multiple Korean securities firms. Jensen Huang was not just admired in Korea. He was held, in the most literal financial sense, by millions of Korean households.
The story's most recent chapter adds another layer. In 2026, South Korea's government introduced the Return to Domestic Market Account, or RIA — a tax-incentive vehicle that allows investors to sell foreign holdings and reinvest in Korean equities with capital gains tax deferral and reduced fees. The most-sold stock through RIA accounts? Nvidia, at 19.1 percent of total sales through Shinhan Investment's accounts. Where did the proceeds flow? SK Hynix, at 15.7 percent of purchases, followed closely by Samsung Electronics. The Nvidia effect had come full circle: Korean investors who rode Nvidia to generational gains were now cycling those profits back into the very Korean companies that supply Nvidia's chips.
When Jensen Huang Visits, Seoul Trades Differently
On October 30, 2025, Jensen Huang sat down for dinner at a chicken restaurant in Seoul with Samsung Executive Chairman Lee Jae-yong and Hyundai Motor Group Chair Chung Euisun. The photograph — three of Asia's most consequential business figures, plates of fried chicken between them — circulated instantly. By morning, the broader AI and semiconductor sector had moved. Han Ji-young, an analyst at Kiwoom Securities, articulated what traders already knew: "The event is likely to influence both price momentum and investor flows in sectors such as AI and robotics that have been leading the market." A June 2026 Korea Times report confirmed that investor attention was tracking Huang's every expected move ahead of a new Korea visit — not just for company-level news, but as a directional signal for the entire Korean tech investment thesis.
This is the gganbu dynamic made financial. In the cultural framing, the gganbu bond is one of mutual trust and shared stakes. In market terms, it translates to something more precise: when Nvidia validates a Korean partner — through an order, an approval, a public mention — the resulting capital flow is not gradual. It is immediate, concentrated, and disproportionate to what the underlying contract values alone would imply. The market is pricing not just the current deal, but the long-term relationship it signals.
The 2026 Supercycle and What Comes Next
Market research firms now estimate the 2026 global memory market could exceed $440 billion. SK Hynix's Cheongju M15X fabrication facility — a 20 trillion won investment — is completing its first clean room in mid-2026, with both HBM3E and HBM4 lines set for production. HBM3E is forecast to account for 66 percent of total HBM output in 2026 even as HBM4 scales, keeping SK Hynix's current advantage intact through the transition. Nvidia's Rubin architecture, requiring eight HBM4 stacks per processor, is slated for the second half of 2026 — and SK Hynix is the company best positioned to supply it.
That trajectory is not without risk. Geopolitical headwinds, export restrictions on advanced chips, and the emergence of new competitive pressure from Micron and Samsung in specific HBM generations all introduce uncertainty. Hanmi's share of SK Hynix's TC Bonder business is expected to face more competition from global rivals as HBM4 packaging evolves. And Korean retail investors, while still heavily exposed to the AI semiconductor theme, are increasingly sophisticated about timing — rotating profits, hedging exposure, and diversifying across the supply chain rather than concentrating solely in Nvidia itself.
Yet the fundamental connection remains structurally intact. Every Nvidia GPU at the frontier of AI performance contains Korean memory. Much of that memory is assembled using Korean equipment. And a significant share of Nvidia's investor base — both institutional and retail — is Korean. The Nvidia effect in Korea is not a speculative narrative. It is a deeply embedded, mutually reinforcing economic relationship that has transformed balance sheets, reshuffled the KOSPI's leadership hierarchy, and turned a Taiwanese-American CEO into something no financial model could have predicted: a proxy for Korean household wealth creation.
Which raises the question that every Korean investor is quietly asking right now: when the HBM supercycle eventually peaks, which part of this gganbu alliance will prove the most durable?
References
SK Hynix Investor Relations — Q3 2025 Earnings Report, October 2025. TrendForce — HBM Market Share and 2026 Memory Outlook, January 2026. UBS Equity Research — SK Hynix HBM4 Market Share Projection for Nvidia Rubin, 2026. Semiconductor Digest — Hanmi Semiconductor U.S. Expansion Announcement, May 2026. Korea Herald — Seoul Shares Rebound on Nvidia-Driven Chip Rally, November 2025. KED Global — Korean Retail Investors 2025 Domestic Performance Report, December 2025. Korea Times — Investors Track Nvidia CEO's Every Expected Move in Korea, June 2, 2026. Seoul Economic Daily — Korean Retail Investors Sell Nvidia, Pour Funds Into SK Hynix and Samsung, April 2026. Notebookcheck — SK Hynix Sells Out DRAM, NAND, and HBM Supply Through 2026, October 2025.
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