SoftBank has completed its $30 billion follow-on investment in OpenAI after paying a third and final $10 billion tranche on 1 October.

The Japanese group says its cumulative OpenAI investment now stands at $64.6 billion, giving it an ownership interest of about 13%. It funded the final payment with proceeds from foreign-currency senior notes issued in September.

The completion matters to both companies. OpenAI receives the committed capital without another financing condition hanging over the deal, while SoftBank converts a large financing program into a concentrated equity position whose value depends heavily on OpenAI’s growth and eventual liquidity.

SoftBank also closed the temporary financing structure behind the purchase. It canceled $10 billion of unused capacity under a $40 billion bridge facility on 30 September after earlier repayments. The company says no borrowing or undrawn commitment remains under that agreement.

Reuters reported that the last payment completed the investment plan announced in February. The transaction adds to a year of unusually large AI infrastructure and model-company commitments, but the disclosed figures do not establish OpenAI’s current valuation or the economic rights attached to SoftBank’s stake.

The next financial checkpoint will be how SoftBank accounts for changes in OpenAI’s value and how much additional capital OpenAI needs for compute. A 13% interest can be strategically important without giving SoftBank operating control, and the release does not describe board rights or governance changes.

Verification

  • VERIFIED: SoftBank says it paid a final $10 billion tranche on 1 October and completed $30 billion of follow-on investment. SoftBank Group
  • VERIFIED: SoftBank reports $64.6 billion in cumulative investment, an approximately 13% interest and cancellation of the bridge facility’s remaining $10 billion capacity. SoftBank Group
  • VERIFIED: Reuters independently reported that the final payment completed the investment plan. Reuters
  • ANALYSIS: The discussion of concentration, liquidity and future capital needs is an interpretation of the disclosed transaction structure.