When SK Hynix's ticker flashed onto the tower at the Nasdaq MarketSite in Times Square on Friday morning, it marked the moment the artificial intelligence boom's most indispensable supplier finally stepped into public view on American markets. The South Korean memory-chip maker priced its American depositary receipts at $149, watched them open at $170, and closed the session at $168.01 — a gain of roughly 13% — after raising $26.5 billion in the largest U.S. listing ever by a foreign company and the second-largest share sale in U.S. history, trailing only SpaceX's $86 billion offering last month.
"It's a kind of dream, and now it's a dream come true," SK Group Chairman Chey Tae-won told CNBC from the exchange floor, flanked by SK Hynix chief executive Kwak Noh-jung and board chairman Koh Seung-beom. Demand for the offering had run more than seven times the shares available, a level of oversubscription that underscored just how eager U.S. investors were for direct exposure to a company most consumers have never heard of but whose chips sit inside nearly every advanced AI system on earth.
The company inside every AI chip
SK Hynix is the world's dominant maker of high-bandwidth memory, or HBM — the specialized, stacked memory that feeds data to AI accelerators fast enough to keep them from stalling. Every Nvidia H100, H200 and Blackwell processor relies on it, and SK Hynix supplies the lion's share. According to the company's filing with the U.S. Securities and Exchange Commission, it holds 56.4% of the HBM market; outside estimates from Counterpoint Research put its share closer to 60% by revenue.
That position has translated into staggering numbers. SK Hynix reported 97.1 trillion won ($64.1 billion) in revenue for 2025, a company record, alongside net income of 42.9 trillion won ($28.3 billion) — a net profit margin of 44%. Its Korea-listed shares have surged more than 630% over the past 12 months, pushing the company's market value past $1 trillion, making it only the second Korean firm after Samsung Electronics to cross that threshold.
The offering itself was structured as 177.9 million ADRs, each representing one-tenth of a common share. The receipts traded under the temporary ticker SKHYV on Friday before moving to their permanent symbol, SKHY, on Monday. Analysts at HSBC estimate the U.S. listing could lift SK Hynix's valuation by as much as 20% by opening the stock to global investors who cannot easily buy on the Korea Exchange — a structural handicap long known as the "Korea Discount," in which shares of the country's chaebol-controlled giants trade below international peers.
From bailout candidate to indispensable supplier
The debut caps an improbable turnaround. Founded in 1983 as Hyundai Electronics, the company was forced to absorb LG Semiconductor after the 1997 Asian Financial Crisis, took on crippling debt, required government and creditor bailouts, and was acquired by SK Group only in 2012. Its pivot point came in 2013, when it co-developed the world's first HBM chip with AMD — a niche product at the time that SK Hynix kept funding through years of thin demand.
"What I really wanted to accomplish when we acquired Hynix was to transform it from a commodity memory producer into a mainstream semiconductor company whose products are indispensable," Chey wrote in a book published in January. "If SK Hynix's HBM is replaced with another product, the AI system may not function properly. What used to be a peripheral component has become a core component."
Why it matters for the AI landscape
The listing is more than a corporate milestone; it is a barometer of how deeply memory has become the choke point of the AI build-out. Compute has dominated the AI investment narrative, but training and running large models is increasingly gated by the availability of HBM — and that supply is critically short. The scarcity is rippling outward, lifting prices for even lower-end memory and forcing device makers like Apple, Sony and Nintendo to raise prices to keep pace.
SK Hynix has pledged to double production capacity within five years, and jointly with Samsung has announced an 800 trillion won ($517 billion) plan to build two new fabrication complexes in southwestern South Korea. Yet executives insist even that will not be enough. "We've announced plans to double production capacity within five years, but every customer says, 'That's still not enough — we need more,'" Chey told CNBC. Kwak was blunter about the crunch ahead, telling Reuters: "We forecast that next year will be the worst year in the industry's history from the supply perspective."
The obvious risk is memory's notorious boom-and-bust cycle. "Let's not forget a few years back these memory makers were negative gross margins," said Patrick Moorhead, founder of Moor Insights & Strategy, recalling an era when producers sold chips below cost. New capacity takes two to three years to come online, and Morningstar analyst Jing Jie Yu warned that fresh fabs "often lead to oversupply in tail years as peak capacity is brought up at the moment demand tapers off."
What to watch next
The immediate test comes Monday, when SKHY begins regular trading and the initial-day euphoria meets sustained price discovery. Beyond that, watch whether the U.S. listing narrows the Korea Discount as SK executives hope, how quickly the new Korean fabs ramp against Samsung's and Micron's competing capacity, and whether long-term supply agreements can smooth the cycle before the next glut arrives. For now, the AI memory boom has a publicly traded flagship on Wall Street — and its customers are still saying they need more.
"We've announced plans to double production capacity within five years, but every customer says, 'That's still not enough — we need more.'"— Chey Tae-won, Chairman, SK Group