SoftBank has wrapped up its massive $22.5 billion follow-on investment in OpenAI, delivering on the full commitment it made back in March 2025. This capital injection marks a major milestone in the ongoing relationship between the Japanese conglomerate and the AI leader.

Following this latest round, SoftBank now holds approximately 11% of OpenAI's equity. The move signals strong confidence in OpenAI's trajectory and reflects the intense competition for stakes in high-growth AI ventures. The completion of this funding round underscores how aggressively major players are positioning themselves in the artificial intelligence space, where valuations and strategic control remain fiercely contested.

With this stake, SoftBank joins a growing list of institutional players betting big on AI infrastructure and capabilities. The investment scale demonstrates how venture capital and corporate funding have evolved in the era of generative AI.