OpenAI Secures $122 B Funding at $852 B Valuation, Helion Gains Fusion Licences and $465 M Investment

OpenAI closed a $122 billion fundraising round in March 2026, lifting the company's valuation to $852 billion. The round followed a previous $40 billion raise in 2025 and underscores the AI firm’s $25 billion annualized revenue run rate and its aim for $30 billion in 2026 revenue.

Helion Energy, the Washington‑based fusion startup backed by Sam Altman, received the world’s first regulatory licences to build and operate a fusion power plant and raised $465 million in a Series G round, valuing the company at $15.5 billion. The firm also achieved a plasma temperature of 150 million °C with its Polaris prototype, surpassing the commercial fusion threshold.

Both announcements highlight the scale of capital flowing into frontier technologies—generative AI and nuclear fusion—within the same portfolio of companies.