Japan and Korea AI Infrastructure: SoftBank, Sakura, SK — 2026-10-18
AI infrastructure stocks across Japan and Korea faced significant volatility this week as global market sell-offs intensified concerns over rising interest rates and the sustainability of massive AI data center debt. In Japan, SoftBank Corp. moved forward with its "AI Data Center GPU Cloud" launch, while Sakura Internet collaborated with NICT and Preferred Networks on new AI evaluation frameworks. In Korea, SK Telecom clarified its overseas expansion plans amid investor scrutiny, and analyst reports highlighted diverging outlooks for Samsung SDS and Naver.
Japan and Korea AI Infrastructure: SoftBank, Sakura, SK — 2026-10-18
Top developments
Global AI Debt Concerns Hit Japan and Korea Markets
The week was dominated by a sharp sell-off in tech and chip stocks, driven by fears that rising US interest rates and high borrowing costs could stall the global AI infrastructure boom. SoftBank Group and Korean tech giants saw significant stock declines as investors demanded proof of profitability from capital-intensive data center projects. This "AI euphoria" correction directly impacts the financing models for new GPU clouds in Osaka and data centers in Ulsan, forcing companies to re-evaluate fundraising timelines.
SoftBank Corp. Launches "Infrinia AI Cloud OS"
SoftBank Corp. confirmed the October 2026 launch of its "AI Data Center GPU Cloud," powered by its proprietary "Infrinia AI Cloud OS." This service is a cornerstone of SoftBank’s "Neocloud" business strategy, aiming to provide domestic Japanese enterprises with sovereign AI computing resources. The launch follows SoftBank’s earlier acquisition of the Sharp Sakai factory site, signaling a shift from pure investment to direct operational control of AI infrastructure.
Sakura Internet and NICT Deploy "Active Evaluation" AI Infrastructure
Sakura Internet, Preferred Networks (PFN), and the National Institute of Information and Communications Technology (NICT) launched a joint initiative on October 14 to implement an "Active Evaluation Infrastructure" for generative AI. This project aims to continuously evaluate and improve AI models, a critical step for enterprise adoption in Japan. The collaboration leverages Sakura’s domestic GPU resources, reinforcing the role of local providers in maintaining data sovereignty and quality assurance for Japanese AI applications.
SK Telecom Clarifies 5GW Overseas Data Center Reports
On October 14, SK Telecom filed a disclosure to clarify media reports regarding its expansion of overseas AI data centers. The company stated its position on the "5GW" scale projects, likely addressing investor concerns about the capital expenditure required for such massive infrastructure. This clarification comes as SK Telecom continues to partner with Nvidia and Brookfield on gigawatt-scale facilities, balancing domestic commitments in Ulsan with international growth.
Analysts Split on Korean AI Infrastructure Leaders
Nomura Securities issued a report this week favoring Samsung SDS over Naver in the Korean AI data center sector. The analysts cited Samsung SDS’s stable internal demand from affiliates as a key driver, maintaining a target price of 250,000 won. In contrast, Naver’s target price was lowered from 210,000 won to 200,000 won, reflecting concerns about the discipline of its external investment and the pace of its Sejong campus utilization.
Local view
Japan: The "Sovereign" Narrative Solidifies Japanese media coverage continues to emphasize the strategic necessity of domestic AI infrastructure. Robostart reported on the "AI-Native 6G" sessions at CEATEC 2026 (Oct 14), where SoftBank, NTT Docomo, KDDI, and Rakuten jointly demonstrated how AI will underpin next-generation telecom infrastructure. This highlights a unified industry front in Japan, where telecom operators are positioning themselves as the primary gatekeepers of AI compute for the public and private sectors.
Korea: Power and Land Conflicts Emerge In Korea, local outlets like Bloomimgbit and Chosun Ilbo are shifting focus from investment announcements to the physical challenges of deployment. Reports highlight growing local resistance to data center construction in regions like Ulsan and Jeollanam-do, citing concerns over power grid strain and water usage. SK Group and other conglomerates are facing increased pressure to disclose not just GPU counts, but concrete plans for energy sourcing and community benefit agreements to secure local permits.
Context & numbers
- SoftBank Stock Volatility: SoftBank Corp. shares traded at approximately €1.36 on October 12, 2026, amid broader market turbulence.
- Korean Investment Scale: South Korea’s National AI Computing Center initiative involves an investment of over 10 trillion won (approx. $7.3 billion) in 2026 alone, targeting domestic LLM development and infrastructure.
- Japan GPU Subsidies: METI has approved subsidies totaling up to 72.5 billion yen for AI computational resources, with Sakura Internet receiving the largest share (~50.1 billion yen) to build out its GPU cloud capabilities.
- Global Capacity Targets: South Korea plans an initial investment of 550 trillion won to develop 8.4 GW of AI data center capacity, a figure that underscores the sheer scale of the infrastructure race compared to Japan’s current operational base.
On the radar
- SoftBank Q2 Earnings (Nov 9, 2026): SoftBank Corp. will report its second-quarter results. Investors will be scrutinizing the revenue contribution from the newly launched GPU cloud services and the impact of debt costs on the "Neocloud" segment.
- Samsung SDS & Samsung Electronics Earnings (Oct 19-23, 2026): Korean market watchers are waiting for Samsung SDS and Samsung Electronics to report Q3 results. These reports will provide insight into whether memory demand and internal data center spending are sustaining the AI hardware cycle in Korea.
- US Big Tech AI Capex Guidance: The upcoming earnings from Meta, IBM, and other US tech giants will be closely watched by Japanese and Korean investors for any signs of reduced AI infrastructure spending, which could ripple through the supply chains of SoftBank, Sakura, and SK.
This content was collected, curated, and summarized entirely by AI — including how and what to gather. It may contain inaccuracies. Crew does not guarantee the accuracy of any information presented here. Always verify facts on your own before acting on them. Crew assumes no legal liability for any consequences arising from reliance on this content.
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