Brett Adcock leads fastest growing billionaires with 1,460% surge
Anthropic filed for its IPO on Monday, positioning the AI startup for a potentially record-setting market debut as soon as next month. A new BestBrokers report places this development in context by ranking the fastest-growing billionaire fortunes over the preceding twelve months.
BestBrokers compiled the rankings by comparing entries on the Forbes Real-Time Billionaires List from 12 October 2025 and 12 October 2026, retrieved via the Wayback Machine. The firm calculated absolute and percentage net-worth changes along with average daily gains and losses, and it also reviewed combined billionaire wealth by country and industry. The complete dataset resides on Google Drive.
The report examines one-year percentage changes in net worth for the period 12 October 2025 through 12 October 2026.
Figure AI founder Brett Adcock recorded the largest percentage increase at 1,460 percent, lifting his net worth from 1.5 billion dollars to 23.4 billion dollars. Adcock established Figure AI in 2022; the humanoid-robotics company's valuation climbed from 2.6 billion dollars in early 2024 to 39 billion dollars in its most recent funding round, making it the United States' most valuable pure-play humanoid-robotics firm. He also founded Hark, which reached unicorn status in May after securing 700 million dollars at a 6 billion dollar valuation.
CXMT founder Zhu Yiming posted the second-highest gain, advancing 672.2 percent from 1.8 billion dollars to 13.9 billion dollars after the Chinese DRAM manufacturer completed a record-breaking listing on Shanghai's STAR Market in July.
Antonio Gracias, founder of Valor Equity Partners, saw his fortune rise 612.5 percent from 2.4 billion dollars to 17.1 billion dollars. The increase followed SpaceX's June stock-market debut; through Valor, Gracias holds approximately 7.3 percent of SpaceX and ranks as its second-largest individual shareholder after Elon Musk.
Moderna chief executive Stéphane Bancel's net worth increased 500 percent from 1.2 billion dollars to 7.2 billion dollars. The gain followed successful late-stage trial results for the company's personalised mRNA skin-cancer vaccine, developed with Merck; the treatment became the first mRNA cancer therapy to succeed in such a trial, propelling Moderna shares up as much as 177 percent in a single day in August.
Chobani founder Hamdi Ulukaya recorded a 409.5 percent advance from 2.1 billion dollars to 10.7 billion dollars after a major investment valued the Greek-yogurt company at 20 billion dollars.
Vicor chairman and chief executive Patrizio Vinciarelli's fortune grew 400 percent from 1.1 billion dollars to 5.5 billion dollars as demand rose for the company's power modules used in AI data centres.
Each of Anthropic's seven co-founders—Tom Brown, Sam McCandlish, Jared Kaplan, Jack Clark, Dario Amodei, Daniela Amodei and Christopher Olah—registered identical 318.9 percent gains, moving from 3.7 billion dollars to 15.5 billion dollars apiece. The uniform increase followed the company's May 65 billion dollar funding round at a 965 billion dollar valuation, which surpassed rival OpenAI and established Anthropic as the world's most valuable AI startup.
Tether executives Paolo Ardoino and Jean-Louis van der Velde each achieved 300 percent growth, advancing from 9.5 billion dollars to 38 billion dollars.
BestBrokers analyst Stanislava Savisheva observed that almost none of the listed fortunes expanded gradually. Most traced to single events in which investors sharply revised a company's value upward through funding rounds, stock-market debuts or, in Moderna's case, clinical-trial results. She noted that fortunes once built over generations can now appear overnight. The report also details the largest absolute wealth gains and losses as well as country- and industry-level breakdowns of billionaire holdings.
The full dataset and additional sections covering absolute gains, losses and geographic and sectoral wealth distributions are available through BestBrokers.
