Mark Zuckerberg overtook Sergey Brin to become the world’s fifth-wealthiest person on Wednesday after Meta’s stock price rose sharply, adding more than $4 billion to his fortune. The move was likely linked to enthusiasm surrounding Muse, Meta’s new AI agent, which has been downloaded 2.8 million times since launching earlier this month, according to Apptopia data reported by multiple outlets. Meta shares have gained more than 34% over the past month and rose about 11% on Monday, lifting Zuckerberg’s net worth by about $25 billion in a single day. Zuckerberg is scheduled to deliver a keynote at the Meta Connect conference at 4 p.m. PDT on Wednesday, where Meta is expected to present new AI products, potentially including smart glasses without a camera to address growing privacy concerns.