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Samsung, SK Hynix Rally on OpenAI Stargate Partnership

by Team Lumida
October 2, 2025
in Markets
Reading Time: 4 mins read
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Key Takeaways

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  • Samsung and SK Hynix struck letters of intent with OpenAI to supply chips and infrastructure for OpenAI’s Stargate AI‑data‑center initiative, sending both stocks to multiyear highs and lifting Kospi.
  • SK Hynix will be a key HBM supplier and plans to scale capacity toward ~900,000 wafers/month for future AI demand; Samsung will push to catch up on HBM4 and help build floating data centers via its affiliates.
  • Korean memory makers control roughly ~80% of the global HBM market (SK Hynix ~62%, Samsung ~17%); the Stargate commitment (initial $100B, up to $500B over four years) signals very large incremental demand for high‑bandwidth memory and related components.
  • Upside: materially stronger chip order visibility, capex cycles for Korean suppliers, and outsized revenue growth for HBM leaders. Risks: execution/timeline slippage, supply‑chain bottlenecks, pricing volatility, and geopolitical/export‑control constraints.

What happened?

OpenAI CEO Sam Altman signed LOIs with Samsung affiliates and SK Hynix to supply advanced memory and help build AI data centers under the Stargate initiative. SK Hynix committed to boost HBM production capacity and collaborate on domestic data‑center builds; Samsung announced involvement across construction, shipbuilding (floating centers) and IT services. The market reacted strongly—shares rallied and the combined market value of the two firms rose by over $30 billion.

Why it matters

Stargate converts high‑level AI demand into concrete, multi‑year procurement for HBM and related semiconductors at a scale few projects have matched. For investors, that implies an extended capex and revenue cycle for SK Hynix and Samsung, potential margin tailwinds if higher HBM ASPs persist, and positive spillovers to Korean equipment and supply‑chain names. It also concentrates critical supply in a few suppliers, increasing their pricing power but exposing customers to capacity constraints and forcing accelerated fab investments. Finally, large cross‑border infrastructure builds (including floating data centers) create new demand vectors but raise execution, regulatory and geopolitical risk.

What’s next

Monitor SK Hynix and Samsung disclosures on wafer‑capacity ramp timelines, HBM3E→HBM4 development milestones, and any binding procurement contracts from OpenAI that convert LOIs into firm orders; track supplier capex guidance, equipment OEM order flow, and Korean export‑control commentary. Watch semiconductor ASPs and inventory metrics for early signs of supply tightness or margin expansion, and use OpenAI/Stargate announcements (location/timing of data centers, chip delivery schedules) as direct demand readouts that will drive near‑term earnings and capex cycles for memory suppliers.

Source
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Lumida's website (referred to herein as the "Website") is limited to the dissemination of general information pertaining to its advisory services, together with access to additional investment-related information, publications, and links. Accordingly, the publication of the Website on the Internet should not be construed by any client and/or prospective client Lumida’s solicitation to effect, or attempt to effect transactions in securities, or the rendering of personalized investment advice for compensation, over the Internet.

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