Nvidia CEO Jensen Huang and SoftBank’s Masayoshi Son recently shared a few laughs and some bittersweet memories at the AI Summit in Tokyo. At the center of their banter? SoftBank’s former role as Nvidia’s largest shareholder – and how they decided to let that golden opportunity slip away.

At Nvidia's AI Summit in Japan, SoftBank announced its plan to build Japan's most powerful AI supercomputer using Nvidia's DGX B200 product. Nvidia CE

CEO Jensen Huang said at an event in Tokyo that Japanese investment giant SoftBank was once the largest shareholder of Nvidia Corp. Both companies now plan to collaborate in the AI industry.

At Nvidia’s AI Summit in Tokyo this week, Jensen Huang, chief executive of Nvidia, and Masayoshi Son, the head of SoftBank, expressed regrets that the former did not privatize Nvidia a decade ago when the latter offered him money to do so.

Jensen Huang and Masayoshi Son drew laughter from the audience of an AI summit as they joked about how SoftBank was once Nvidia's largest shareholder