SoftBank Completes Final $10 Billion Tranche of OpenAI Commitment, Bringing Cumulative Stake to $64.6 Billion

SoftBank Group has executed the final $10 billion tranche of its $30 billion follow-on commitment to OpenAI, bringing its cumulative investment in the artificial intelligence developer to $64.6 billion for a roughly 13% ownership stake.
The final installment completes the multi-tranche funding arrangement tied to OpenAI's historic $122 billion financing round, which closed earlier at an $852 billion post-money valuation alongside co-anchors Amazon and Nvidia.
Market participants note that SoftBank's capital deployment—partially financed via aggressive high-yield debt issuance—underscores the escalating scale of infrastructure-grade financing required to support frontier compute clusters and expanding data center footprints.