The 58-year-old tycoon has a 9.9% stake that’s now estimated to be worth $4.1 billion less than almost a year ago, based on the share buyback, average analyst estimates and Fidelity Investments’ 

Insatiable demand for artificial intelligence investments has made chipmaker Nvidia Corp. the best-performing stock on the S&P 500 this year. It’s also given the fortune of Chief Executive Officer Jensen Huang a major boost.

From the Medicis to the Morgans, the business of lending, trading or investing money has long been a path to astonishing riches. The largest fortunes go to the risk-takers and innovators who are comfortable at the cutting edge of mainstream finance.

TikTok CEO Shou Chew’s testimony before Congress last week has done little to assuage US security concerns surrounding the social-media company. Yet it has shed new light on the fortune of one of the world’s richest people: Zhang Yiming, the 39-year-old co-founder of ByteDance Ltd., TikTok’s Chin