SoftBank Group's stock surged 15% following significant investments in artificial intelligence and strategic financial maneuvers. The Japanese investment giant announced a $30 billion follow-on investment in OpenAI through its Vision Fund 2, increasing its stake in the ChatGPT maker to approximately 13%. The first $10 billion of this investment was executed on April 1, 2026. To support these capital-intensive initiatives, SoftBank secured a $40 billion bridge facility in March 2026, providing financial flexibility without immediate shareholder dilution. In addition to its OpenAI investment, SoftBank is launching Roze, an AI and data center venture aiming for a $100 billion valuation with an IPO planned for this year. The company also exited its crypto investment by selling its stake in Twenty One Capital to Tether in May 2026, focusing its portfolio on AI and infrastructure. Analysts attribute the stock rally to OpenAI's growth and an improved balance sheet outlook for SoftBank.