SoftBank Group

ソフトバンクグループ / ソフトバンクグループ株式会社

An investment holding company that controls Arm and Ampere Computing while directing massive capital into OpenAI and the Stargate AI data-center initiative.

TSE: 9984 (Prime Market)
Other: SFTBY (OTC ADR)
Profile as of September 12, 2026
#24 in the AsiaAI Tech Index
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SoftBank Group is a highly concentrated financial vehicle for AI infrastructure, semiconductor IP, and frontier models. Its founder-led structure enables massive capital deployment into assets like Arm and OpenAI, but this approach ties its valuation to volatile portfolio marks, debt capacity, and the execution of third-party partners.

Key figures

Revenue FY2025: Japanese yen 7.798 trillion
Revenue growth FY2025: 7.7%
Operating margin FY2025: Negative 0.1%
Net income FY2025: Japanese yen 5.002 trillion
R&D spend: Not disclosed
Capital expenditure: Not disclosed
Market capitalization Sep 11, 2026: US$247.32 billion Estimate
Net asset value Mar 31, 2026: Japanese yen 40.1 trillion
Arm fiscal 2025 revenue FY2025: US$4.92 billion
OpenAI follow-on investment Feb 2026: US$30.0 billion
Stargate target investment Over four years: US$500 billion

Overview

SoftBank Group Corp. is a Tokyo-listed Japanese investment holding company. It controls assets and financing vehicles rather than operating a high-volume semiconductor manufacturing or cloud-computing business itself. It must be distinguished from SoftBank Corp., the separately listed Japanese telecommunications subsidiary.

SoftBank Group owns and consolidates investment, fund-management, telecommunications, semiconductor-IP, energy, and robotics-related businesses. Its core differentiator is the combination of controlling ownership in Arm, founder control over capital allocation, and the ability to assemble large AI-related commitments across investments, chip design, models, energy, and infrastructure.

The AI angle

The company supplies AI exposure through capital allocation, ownership of Arm and Ampere Computing, investment in OpenAI, and its financial role in Stargate. Arm provides the CPU instruction-set architecture, processor intellectual property, and software tools used by chip designers in AI-enabled devices. Ampere adds server CPU design based on the Arm architecture.

SoftBank Group agreed in February 2026 to invest US$30.0 billion in OpenAI, bringing its expected ownership interest to about 13%. Stargate is an infrastructure initiative where SoftBank is the financial lead, targeting US$500 billion in AI infrastructure investment. The link to AI is therefore mostly through equity valuation, financing requirements, and infrastructure commitments rather than consolidated operating revenue.

Technology and moat

The group's defensibility rests heavily on Arm's installed architecture, long-lived licensing relationships, and broad ecosystem of chip licensees. Customers building Arm-compatible products must maintain architecture compatibility, toolchains, and software ecosystems across multiple product generations.

Against Intel, Arm is stronger in energy-efficient, licensable CPU architecture and broad mobile adoption. Against RISC-V, Arm has a more established commercial licensing structure and mature software support. Ampere provides a direct server-CPU design asset, though it competes with much larger incumbents and internal hyperscaler silicon efforts.

Five-pillar assessment

Scale and market position: A massive investment holding company with Japanese yen 7.79 trillion in consolidated revenue and a net asset value of Japanese yen 40.1 trillion, driven by major holdings in Arm and OpenAI.
Technology and R&D: Controls Arm's ubiquitous CPU architecture and Ampere's server CPU designs, providing foundational intellectual property for mobile, edge, and data-center computing.
Supply-chain centrality: Partners with OpenAI, Oracle, and NVIDIA on the Stargate infrastructure initiative, while Arm's ecosystem spans nearly all major semiconductor designers and foundries.
Financial momentum: Aggressively expanding AI exposure through a US$30 billion follow-on investment in OpenAI, the acquisition of Ampere, and the US$500 billion Stargate infrastructure plan.
Governance and quality: Founder-controlled by Masayoshi Son, whose combined Chairman and CEO roles and large equity stake concentrate decision-making around high-conviction capital allocation.

Supply chain and relationships

Arm and Ampere depend on foundry capacity, EDA tools, design software, IP verification, packaging, memory, board manufacturers, and server OEM qualification. SoftBank Group does not disclose supplier contracts for Arm or Ampere in sufficient detail to identify all material suppliers.

On the customer side, Arm licenses its IP to a broad semiconductor ecosystem. SoftBank Group does not publicly identify its largest consolidated customers or report customer revenue concentration at the group level.

Partners

OpenAIEquity investee and Stargate operational lead
OracleStargate computing system collaborator
NVIDIAStargate computing system collaborator
MGXInitial Stargate equity funder
ABBAgreed to acquire its robotics business
DigitalBridgeAgreed to acquire for US$4.0 billion

Competitors

IntelInferredCompetes with Arm and Ampere in CPUs
Advanced Micro DevicesInferredCompetes with Ampere in server CPUs
MicrosoftInferredCompetes indirectly through Azure infrastructure
Amazon Web ServicesInferredCompetes in cloud AI infrastructure

Geopolitics and risk

Arm-related CPU IP, AI server processors, and AI infrastructure operate in markets affected by U.S. export restrictions and China technology controls. Changes in these rules can limit customers, design tools, manufacturing options, or performance tiers.

Ampere and Arm licensees depend on advanced foundry capacity and supply chains geographically concentrated in Taiwan, South Korea, the United States, Japan, and Europe. Transactions like Stargate and Ampere also subject the group to U.S. investment review, antitrust scrutiny, and infrastructure permitting.

Risk matrix
Risk	Severity	Why it matters
OpenAI valuation and funding exposure	High	Valuation changes and financing needs can materially affect NAV and liquidity.
AI infrastructure execution	High	Stargate requires land, power, construction, and hardware procurement to remain aligned.
Arm customer architecture competition	High	Competition from x86, RISC-V, and internal hyperscaler silicon can affect licensing economics.
Export controls and China exposure	High	U.S. restrictions can limit customers, manufacturing options, or performance tiers.
Semiconductor supply-chain concentration	High	Arm licensees and Ampere depend on foundries and supply chains concentrated in East Asia and the West.
Leverage and refinancing	High	The group finances investments through asset sales, bonds, and large bridge facilities.
Portfolio valuation volatility	High	Income and NAV are highly sensitive to fair-value changes in portfolio assets.
U.S. regulatory and political exposure	Medium	Transactions subject the group to U.S. investment review, antitrust, and energy policy.

Governance and ownership

SoftBank Group is an independent, founder-controlled public company. It is not state-owned, and its control structure rests on Masayoshi Son's shareholding and executive roles. Son held 32.73% of shares as of March 2026 and serves as Chairman and CEO.

This structure enables large bets on AI infrastructure but amplifies company-specific execution and valuation risk. The board includes independent directors and an Audit & Supervisory Board, but decision-making remains highly concentrated around Son's capital-allocation model.

What to watch

Whether SoftBank Group completes the remaining portion of the February 2026 US$30.0 billion OpenAI follow-on investment.
Whether Stargate converts its announced US$500 billion ambition into operating data-center capacity.
Arm's license-and-royalty growth and its ability to offset competition from RISC-V and x86.
Ampere's post-acquisition product roadmap, foundry access, and server OEM design wins.
SoftBank Group's loan-to-value ratio, cash balance, and bridge-facility usage as commitments require funding.
The closing status of the ABB robotics and DigitalBridge acquisitions.

Recent developments

July 1, 2026Executed the second US$10.0 billion tranche of its 2026 OpenAI follow-on investment.
February 27, 2026Announced a new US$30.0 billion follow-on investment in OpenAI through SoftBank Vision Fund 2.
December 26, 2025Completed an additional US$22.5 billion OpenAI investment.
November 25, 2025Completed the acquisition of all Ampere equity interests through a subsidiary.
January 21, 2025Announced Stargate, a company intended to invest US$500 billion over four years in AI infrastructure for OpenAI.

Coverage on AsiaAI.FYI

OpenAI’s Misalignment Framework: A Self-Regulation Shield Against Hard Safety Laws September 17, 2026
Sony’s 50% Image Sensor Share: The AI Vision Bottleneck Facing Western Device Makers September 3, 2026
U.S. Cloud Export Controls: Closing the Remote Access Loophole for Chinese AI Firms August 29, 2026
Is Unitree’s $905M IPO the Spark for a Chinese Humanoid Robotics Bubble? August 18, 2026
Can China’s CXMT Conquer Global DRAM Markets Without ASML’s Advanced Tech? August 10, 2026
East Asia’s AI Wars: GPT-5.6, DeepSeek’s Rise, and Critical Resource Control June 27, 2026

About this profile

Compiled with AI-assisted research from company filings, market data, and published reporting as of September 12, 2026, then reviewed by AsiaAI.FYI. Figures marked Estimate are not company-reported. Check primary filings before relying on any number.

Confidence: B. Audited and company-filed sources support identity, governance, and financial metrics, but consolidated R&D, capital expenditure, and detailed supplier relationships are not disclosed.

Main sources: SoftBank Group annual report and financial-report materials; Company earnings presentations; Press releases; Shareholder disclosures; Market-data sources.

All 66 sources

Position in the AI stack

A primary financier and holding company for foundational AI assets, controlling Arm's CPU architecture and funding OpenAI's models and Stargate infrastructure.

Legal name: SoftBank Group Corp.
Formerly: SoftBank Corp.
Headquarters: Minato, Tokyo, Japan
Founded: 1981
Founders: Masayoshi Son / 孫正義
Leadership: Masayoshi Son / 孫正義, Chairman and CEO
Yoshimitsu Goto / 後藤芳光, Board Director, Corporate Officer, Senior Vice President, CFO & CISO
Rene Haas, Board Director
Kenneth A. Siegel, External Board Director
Employees: Approximately 73,924 (March 2026)
Ownership: Publicly listed
Listings: TSE: 9984 (Prime Market)
Other: SFTBY (OTC ADR)
Business: Investment holding company focused on AI, semiconductor IP, and telecommunications
Sector: Chip Design
Investment & Holding Groups
Website: group.softbank/en