SoftBank shares dropped more than 13% on September 14, 2026, their steepest single-day fall since late June, triggered by warnings from Anthropic CEO Dario Amodei, who published an essay on September 12 calling for a deliberate deceleration in the development of the most powerful AI models, and OpenAI CEO Sam Altman, who described the current moment as ill-advised for an initial public offering. The Japanese conglomerate has committed roughly $65 billion to OpenAI, building toward an ownership stake of around 13%, and the potential IPO delay threatens its liquidity strategy to convert paper gains into real returns. SoftBank’s stock has become a real-time sentiment indicator for the OpenAI IPO narrative, with each delay or cautionary statement from OpenAI’s leadership moving the share price.
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