May was a good month to be a billionaire, as the S&P 500 and Nasdaq climbed by 5% and 8%, respectively, boosting the fortunes of the world’s ten richest people to $2.9 trillion combined as of June 1 at 12 a.m. Eastern time. As a group, they’re $220 billion richer than they were a month ago. No one had a better May than Larry Ellison, who is back in the top five after adding a staggering $71 billion to his fortune (which is now an estimated $276 billion). For that, Ellison can thank red-hot demand for AI. The software giant he cofounded and runs as chairman and chief technology officer is building multiple gigawatt-scale data centers across the U.S. and, on May 1, announced an agreement with the U.S. Department of War to deploy its AI tools on classified networks for government warfighting, intelligence and enterprise operations. Oracle stock, of which Ellison owns around 40%, climbed 40% in May. Hot on Ellison’s heels is Michael Dell, the month’s second-biggest gainer after adding $67 billion as the AI boom continues to lift his Dell Technologies, too. The tech giant reported banner earnings on May 28, smashing expectations and disclosing a 757% year-over-year surge in annual AI server revenue—helping drive the stock up 33%, its best trading day ever. In all, Dell stock jumped more than 100% in May. Both Ellison and Dell edge past Meta’s Mark Zuckerberg, who drops to No. 7—despite getting $7 billion richer, as shares of the Facebook parent company climbed just 3%, underperforming the broader market and Zuck’s billionaire competitors amid huge AI capital expenditures and employee layoffs at Meta. Learn more about your ad choices. Visit megaphone.fm/adchoices