SoftBank’s OpenAI stake reaches about 13% after final $10B tranche

SoftBank's OpenAI position is now large enough to make its balance sheet a proxy for private AI valuations, and the fact that the final tranche was funded with foreign-currency senior bonds rather than operating cash is the detail worth noting. That debt-funded structure ties SoftBank's credit profile more tightly to OpenAI's fortunes, a concentration that cuts both ways if private AI marks move. Whether SoftBank continues to lean on bond issuance for AI exposure, and how its lenders price that concentration, is the open question.