Dec 30 (Reuters) – SoftBank Group (9984.T), opens new tab has completed its $40 billion investment in OpenAI, a source familiar with the matter said on Tuesday, marking one of the largest private funding rounds ever and deepening founder Masayoshi Son’s bet on AI.

SoftBank has been building one of the largest private technology investment programs in the world, with a particular focus on artificial intelligence and related infrastructure such as data centers.

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AI has become the central axis of global technology markets this year, driving a surge of investment by the world’s largest companies and reshaping investor expectations.

The Japanese conglomerate and the ChatGPT maker did not immediately respond to Reuters requests for comment.

In March, SoftBank agreed to invest up to $40 billion into a for-profit subsidiary of OpenAI, with the funding structured as a combination of direct capital and syndicated co-investment from other backers.

The deal valued OpenAI at around $300 billion on a post-money basis, but a later secondary stock sale completed in October, valued the company at around $500 billion, according to Pitchbook data.

SoftBank Group sent over the final $22 billion to $22.5 billion investment after it had syndicated $10 billion and invested $8 billion in OpenAI, the source said.

CNBC first reported the news earlier in the day.

OpenAI has emerged as a central pillar of that industry-wide AI spending push.

The ChatGPT maker along with Oracle (ORCL.N), opens new tab and other stakeholders has planned a project dubbed “Stargate”, a vast, multi-year data-center initiative aimed at supporting next-generation AI models, with backing from major investors including SoftBank.

Reporting by Akash Sriram in Bengaluru and Krystal Hu in San Francisco; Editing by Anil D’Silva, Shailesh Kuber and Krishna Chandra Eluri

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Krystal reports on venture capital and startups for Reuters. She covers Silicon Valley and beyond through the lens of money and characters, with a focus on growth-stage startups, tech investments and AI. She has previously covered M&A for Reuters, breaking stories on Trump’s SPAC and Elon Musk’s Twitter financing. Previously, she reported on Amazon for Yahoo Finance, and her investigation of the company’s retail practice was cited by lawmakers in Congress. Krystal started a career in journalism by writing about tech and politics in China. She has a master’s degree from New York University, and enjoys a scoop of Matcha ice cream as much as getting a scoop at work.