Kuaishou

At age 39, Su announced he was stepping down as CEO to focus on developing Kuaishou's long-term strategy, becoming the third Chinese tech billionaire that year (following ByteDance's Zhang Yiming and Pinduoduo's Colin Huang) to relinquish day-to-day operational control amid the government's tech-sector crackdown.

Co-founder Cheng Yixiao, who created the Kuaishou app a decade earlier as a tool for creating and sharing animated pictures, took over as CEO and became responsible for company operations, reporting structurally to Su as chairman.

Kuaishou had gone public in Hong Kong earlier in 2021 and had grown into China's second-largest short-video platform after ByteDance's Douyin, per SCMP.

Stepped down as Kuaishou CEO in October 2021, transferring operational responsibility to co-founder Cheng Yixiao while remaining chairman.

Su remained chairman of Kuaishou with unchanged voting rights, while Cheng Yixiao assumed CEO responsibilities for company operations.