SourceThe Next Web (TNW)•Stalecollected in 54m
SoftBank hits record high on OpenAI IPO speculation
Market movements in SoftBank signal high investor anticipation for a major OpenAI liquidity event.
30-Second TL;DR
What Changed
SoftBank shares hit record high in Tokyo
Why It Matters
Increased valuation of SoftBank reflects high investor confidence in the AI ecosystem, specifically regarding the commercialization of large-scale AI models.
What To Do Next
Follow OpenAI's official announcements regarding corporate structure and funding to understand long-term roadmap implications.
Who should care:Founders & Product Leaders
Key Points
- •SoftBank shares hit record high in Tokyo
- •Market betting on an upcoming OpenAI IPO
- •SoftBank acts as a proxy for AI-heavy investments
- •Nikkei 225 index crossed 65,000 for the first time
Key numbers$64.6 billion13%$852 billion$122 billion
Deep Insight
Background and context from public sources — not the original article. 24 sources cited.
Enhanced Key Takeaways
- •SoftBank's total investment in OpenAI is projected to reach approximately $64.6 billion by October 2026, securing roughly a 13% ownership stake in the AI developer.
- •In addition to OpenAI, SoftBank is also preparing its power infrastructure unit, SB Energy, for a confidential IPO in the U.S., signaling a broader strategy to build foundational energy and data center infrastructure crucial for AI.
- •OpenAI's valuation has surged, reaching an $852 billion post-money valuation after a $122 billion funding round in April 2026, co-led by SoftBank and other strategic partners.
- •Despite significant revenue growth, with annualized revenue estimated at $25 billion in February 2026, OpenAI is projected to incur substantial losses, with profitability not anticipated until the 2030s.
- •Arm Holdings, another major SoftBank investment, successfully went public on Nasdaq on September 14, 2023, raising $4.87 billion at a $54.5 billion valuation, with SoftBank retaining approximately 90% ownership.
Competitor Analysis
| Competitor | Market Share (AI/Chatbot) | Key Differentiators/Notes |
|---|---|---|
| Grok (xAI) | 38.77% (AI category) / 15.2% (chatbot, Jan 2026) | Gaining significant ground, especially in chatbot market. |
| OpenAI ChatGPT | 13.37% (AI category) / 45.3% (chatbot, Jan 2026) | Leading chatbot, but market share is contracting as competitors surge. |
| Google Gemini | 25.1% (chatbot, Jan 2026) | Rapidly increasing market share, up from 14.7% in Jan 2025. |
| Anthropic | Significant ground gained, $19B annualized revenue (May 2026) | Positioned as a disciplined, reliable choice for enterprise clients. |
| Optimole | 6.24% (AI category) | Specific AI tool competitor. |
Technical Deep Dive
- Transformer Architecture: GPT models, including ChatGPT, are based on the transformer deep learning architecture, which relies heavily on the attention mechanism.
- GPT-3 (2020): Featured 175 billion parameters, trained on trillions of words, and demonstrated in-context learning, allowing tasks to be performed with few examples in the prompt. It used 96 attention layers, each with 96x 128-dimension heads.
- GPT-4 (2023): Believed to utilize a Mixture of Experts (MoE) architecture, with an estimated 1.8 trillion total parameters across 120 layers and 16 expert networks. It introduced multimodal input (vision) and extended context to 128K tokens.
- GPT-5 (August 2025): Focused on capability over parameter counts, achieving high scores in math and coding benchmarks, and featuring a real-time router for dynamic switching between fast and 'thinking' modes.
- Training Costs: Training large models like GPT-3 required significant computing power, estimated at over $4.6 million using Tesla V100 cloud instances.
Future ImplicationsAI analysis grounded in cited sources
SoftBank's investment strategy will increasingly focus on building out comprehensive AI infrastructure, not just AI models.
The planned IPO of SB Energy, SoftBank's power infrastructure unit, alongside its substantial investment in OpenAI, indicates a strategic shift towards owning both the AI models and the underlying energy and data center infrastructure required to power them.
OpenAI's potential IPO will serve as a critical benchmark for valuing frontier AI companies in public markets.
The IPO will test how public investors value frontier AI, considering its visible demand, massive costs, and the blurring lines between software and infrastructure companies.
The intense competition in the AI chatbot market will continue to challenge OpenAI's dominance.
OpenAI's market share in the chatbot sector has been contracting, with competitors like Google Gemini and Grok gaining significant ground, suggesting a more fragmented and competitive landscape ahead.
Timeline
2015-12
OpenAI founded as a non-profit with a $1 billion pledge from investors.
2016-09-05
SoftBank completes acquisition of Arm Holdings for approximately $31 billion.
2019-07
OpenAI partners with Microsoft, backed by a $1 billion investment, and restructures into a capped-profit entity.
2023-09-14
Arm Holdings goes public on Nasdaq, raising $4.87 billion at a $54.5 billion valuation.
2025-10
OpenAI completes a secondary share sale, valuing the company at $500 billion, making it the world's most valuable private company.
2026-04
OpenAI closes a $122 billion funding round at an $852 billion post-money valuation, with SoftBank as a co-lead investor.
- 2015-12OpenAI founded as a non-profit with a $1 billion pledge from investors.
- 2016-09-05SoftBank completes acquisition of Arm Holdings for approximately $31 billion.
- 2019-07OpenAI partners with Microsoft, backed by a $1 billion investment, and restructures into a capped-profit entity.
- 2023-09-14Arm Holdings goes public on Nasdaq, raising $4.87 billion at a $54.5 billion valuation.
- 2025-10OpenAI completes a secondary share sale, valuing the company at $500 billion, making it the world's most valuable private company.
- 2026-04OpenAI closes a $122 billion funding round at an $852 billion post-money valuation, with SoftBank as a co-lead investor.
Sources (24)
Factual claims are grounded in the sources below. Forward-looking analysis is AI-generated interpretation.
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