India, Dec. 31 -- SoftBank Group Corp. on Wednesday said it has completed an additional investment of $22.5 billion in OpenAI on December 26, marking the second closing of its commitment announced earlier this year.

The investment forms part of SoftBank's plan to invest up to $40.0 billion in the artificial intelligence major, a commitment first disclosed on March 31, 2025.

Following the latest investment, SoftBank's aggregate ownership interest in OpenAI now stands at approximately 11%.

The Japanese conglomerate had completed the first closing in April 2025, investing $7.5 billion through SoftBank Vision Fund 2 (SVF2). The second closing involved an additional $22.5 billion, also routed through SVF2.

Commenting on the investment, Mas...