Meet Masayoshi Son, billionaire SoftBank founder with a Cali mansion

Masayoshi Son, the billionaire founder and CEO of the Japanese holding company SoftBank, is worth an estimated $15.3 billion, according to Bloomberg's Billionaires Index.

SoftBank has “lost faith” in WeWork CEO Adam Neumann and is moving to demote him, the Financial Times reported September 22.

He's the second-richest person in Japan after Uniqlo founder Tadashi Yanai.

Through SoftBank and his first $100 billion Vision Fund, Son has invested millions in some of Silicon Valley's biggest tech companies, including Uber, WeWork, Slack, and DoorDash.

He owns $45 million worth of real estate in Tokyo as well as a $117.5 million estate in Silicon Valley.

WeWork's biggest backer has “lost faith” in the coworking company's founder Adam Neumann, the Financial Times reported September 22. SoftBank heavyweights are part of a movement within WeWork's board and investors to oust Neumann over his “self-dealing” and marijuana use.

Softbank has invested almost $11 billion in WeWork through Softbank, Business Insider previously reported. It was set to pour an additional billion dollars into WeWork's IPO before it was postponed on September 17.

Read more: How WeWork's CEO grew a $10 billion relationship with SoftBank CEO Masayoshi Son, whom he calls 'Yoda'

SoftBank's founder and CEO is Masayoshi Son, who's worth an estimated $15.3 billion, per Bloomberg's Billionaires Index. That makes him the second-richest person in Japan after Uniqlo founder Tadashi Yanai. Through SoftBank and his first $100 billion Vision Fund, Son has invested millions in some of Silicon Valley's biggest tech companies, including Uber, Slack, and DoorDash.

Here's a look at Son's life, career, investments, and real-estate portfolio.