SK hynix seeks $28B in US listing to expand AI chip capacity

Key Takeaways

• SK hynix is raising $28 billion through a US share sale, one of the largest equity offerings ever
• The funds will support expansion of High Bandwidth Memory production for AI accelerators
• SK hynix controls roughly 90% of the HBM market and is NVIDIA's primary memory supplier

SK hynix, South Korea's second-largest chipmaker, launched a $28 billion US share sale on Monday. The offering ranks among the largest equity raises in history, and the company plans to use the funds to expand production of the high-bandwidth memory chips powering AI infrastructure worldwide.

The timing is deliberate. Hyperscalers like Microsoft, Google, Amazon, and Meta are spending billions on data centers packed with AI accelerators. Those accelerators need HBM chips. SK hynix makes most of them.

Why SK hynix dominates the AI memory market

SK hynix holds an estimated 90% market share in High Bandwidth Memory, the specialized DRAM that NVIDIA's H100, H200, and Blackwell GPUs require. Without HBM, these chips cannot move data fast enough to train large language models or run inference at scale. Samsung and Micron compete in this space, but SK hynix has consistently shipped newer generations, HBM3 and HBM3E, ahead of rivals.

NVIDIA CEO Jensen Huang has publicly acknowledged SK hynix as a critical supplier. The relationship is symbiotic: NVIDIA designs the most sought-after AI accelerators, and SK hynix supplies the memory that makes them work. When NVIDIA sells more GPUs, SK hynix sells more HBM.

What the $28 billion will fund

The raise, equivalent to ₩43 trillion, will go toward capacity expansion and R&D. HBM production is complex. Each chip stacks multiple DRAM layers using through-silicon vias, a process that demands specialized equipment and clean-room space. Building new fabs takes years and costs billions.

SK hynix already operates advanced facilities in Icheon and Cheongju, South Korea, plus a joint venture fab with Intel in Dalian, China. The company is also building a new fab in Indiana as part of broader efforts to diversify production outside Asia.

The US listing gives SK hynix direct access to American capital markets. It also raises the company's profile among institutional investors who may be more familiar with Micron, the US-based competitor, than with Korean chipmakers.

The competitive pressure behind the raise

Samsung, the world's largest memory chipmaker, has stumbled in HBM. Its HBM3 chips reportedly failed NVIDIA's qualification tests in 2024, handing SK hynix an even larger share of the market. But Samsung is not standing still. The company is pouring resources into catching up, and Micron has also improved its HBM offerings.

SK hynix's lead is real but not permanent. Memory markets are cyclical, and today's dominance can erode quickly if a competitor delivers a better product or undercuts on price. The $28 billion raise is partly defensive. It ensures SK hynix can invest faster than rivals can catch up.

What this means for AI builders

For teams building AI products, the SK hynix raise signals continued supply constraints. HBM production cannot scale as quickly as demand. Even with $28 billion in new capital, new fab capacity takes 18 to 24 months to come online. GPU shortages will persist, and cloud compute prices will stay elevated.

The flip side: SK hynix's investment suggests memory vendors expect AI infrastructure spending to continue for years, not quarters. If you are building on the assumption that GPU costs will drop dramatically by 2026, the supply chain disagrees.

South Korea's broader chip strategy

The SK hynix listing comes as South Korea accelerates semiconductor investment. President Yoon Suk Yeol has pushed for regulatory changes to speed up fab construction, and the government has pledged over $500 billion in public and private investment through 2030. SK hynix is part of the SK Group conglomerate, South Korea's second-largest chaebol, giving it access to capital and political influence that smaller competitors lack.

The race is global. The US, Japan, and Europe are all subsidizing domestic chip production. Taiwan's TSMC, Samsung, and Intel are building new fabs in Arizona, Texas, and Ohio. SK hynix's US listing positions the company to tap American capital while its Indiana fab positions it to tap American subsidies.

Frequently Asked Questions

Why is SK hynix listing in the US instead of Korea?

A US listing gives SK hynix access to deeper capital markets and increases visibility among American institutional investors. It also aligns with the company's expansion in Indiana and broader strategy to diversify beyond Asia.

What is HBM and why does it matter for AI?

High Bandwidth Memory is a type of DRAM that stacks multiple memory layers to deliver faster data transfer. AI accelerators like NVIDIA's H100 require HBM to move training data quickly enough to be useful.

How does SK hynix compare to Samsung and Micron in AI memory?

SK hynix holds roughly 90% of the HBM market. Samsung has struggled with quality issues, and Micron is a smaller player. SK hynix supplies most of NVIDIA's memory.

When will new HBM capacity come online?

New fab capacity typically takes 18 to 24 months to become operational. Even with accelerated investment, supply constraints will persist into 2026 or 2027.

Source: Forbes Middle East / Forbes Middle East