SoftBank Group
Company
Capital & Investors
9984.T · TSE
Masayoshi Son's everything-bet on AI: Arm, OpenAI, Stargate, Ampere, Graphcore.
You're looking at a company record: what this company does in the AI stack, and every chip, technology, facility and company it's linked to below.
Price (delayed)5,427.0 JPY
Day2.20%
Week-15.52%
YTD15.23%
Market cap30.93T JPY
As of00:28 UTC
Quotes are delayed/indicative; research only, never investment advice.
SoftBank owns ~90% of Arm, led OpenAI's record 2025 financing (a round reported up to $40B), co-chairs the Stargate program, and bought Ampere Computing and Graphcore — the single most aggressive capital allocator of the AI era.
How this connects to the rest of the stack
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Sources
Record reviewed as of 2026-01-15 — see Methodology.