SoftBank Group
Also known as SoftBank Group Corp., SoftBank
Japanese investment holding company run by Masayoshi Son; owns most of Arm, about 13% of OpenAI.
Run by Masayoshi Son.
Led by
Invested in
- OpenAIOrganization
about 13% after completing a $30B investment on 1 October 2026; $64.6B invested in total source on OpenAI
Board
Yoshimitsu Goto, Ken Miyauchi, Rene Haas, Yutaka Matsuo (external, independent), Kenneth Siegel (external), David Chao (external, independent), Tetsuji Ohashi (external, independent), Miwa Ohmori (external, independent) 2
Founded by
- Masayoshi Son
Partners
- OpenAIOrganization
Stargate joint venture with Oracle and MGX, estimated at $500B over four years · since 21 Jan 2025 source on OpenAI
- Masayoshi Son founded SoftBank in Tokyo in 1981 and is its Chairman and CEO.
- It is an investment holding company listed in Tokyo.
- It bought Arm in 2016 and kept most of it after Arm's 2023 IPO.
- It has invested $64.6B in OpenAI and is a partner in the Stargate data-center venture.
Why it matters
- One of the largest backers of AI companies and the owner of Arm, whose chip designs run most phones.
- Founded
- 3 September 1981, by Masayoshi Son1
- Headquarters
- Minato, Tokyo1
- Public
- Tokyo Stock Exchange, ticker 99841
- Employees
- 73,677 consolidated (2026)1
- Board composition
- Nine directors, as of 24 June 20262
Who owns and runs it
Run by Masayoshi Son.
Led by
Invested in
- OpenAIOrganization
about 13% after completing a $30B investment on 1 October 2026; $64.6B invested in total source on OpenAI
Board
Yoshimitsu Goto, Ken Miyauchi, Rene Haas, Yutaka Matsuo (external, independent), Kenneth Siegel (external), David Chao (external, independent), Tetsuji Ohashi (external, independent), Miwa Ohmori (external, independent) 2
Notable holdings and deals
The line under a date fills as it gets older: empty when new, full at 2 years.
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Arm1
Acquired for more than $32B; kept 90.6% when Arm listed in September 2023.
-
Vision Fund1
Created with Saudi Arabia's Public Investment Fund.
-
Stargate1
Data-center joint venture with OpenAI, Oracle and MGX, estimated at $500B.
-
Ampere Computing1
Agreed in March 2025 for $6.5B; completed late November 2025.
-
ABB Robotics1
Agreed at an enterprise value of $5.375B; closing expected mid-to-late 2026.
-
DigitalBridge1
Agreed all-cash deal of about $4B, subject to regulatory approval.
-
OpenAI3
Completed a $30B investment in three $10B tranches; $64.6B in total, about a 13% stake.
Connections
Founded by
- Masayoshi Son
Partners
- OpenAIOrganization
Stargate joint venture with Oracle and MGX, estimated at $500B over four years · since 21 Jan 2025 source on OpenAI
Links
Sources
Last checked against its sources today
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