SoftBank Group completed the final $10 billion tranche of its $30 billion follow-on investment in OpenAI through SoftBank Vision Fund 2, lifting its cumulative investment in the artificial intelligence company to $64.6 billion and its ownership stake to about 13%. SoftBank funded the tranche with proceeds from foreign-currency-denominated senior notes issued the previous week. Its shares fell 5.6% to 6,329.0 yen by 01:34 ET (05:34 GMT). The company also canceled the remaining $10 billion of undrawn capacity under a $40 billion bridge facility effective Sept. 30; following an earlier repayment, all borrowings under the facility have been repaid and no undrawn commitments remain. The investment is part of Masayoshi Son’s aggressive artificial-intelligence strategy and has drawn scrutiny over SoftBank’s funding needs and leverage. The commitment was tied to OpenAI’s latest fundraising round, which secured $122 billion in commitments and valued the company at $852 billion. SoftBank previously raised $11.1 billion through high-yield bonds, with yields reaching 9.75%, to fund the investment and refinance existing obligations.