Google Co-founders Larry Page and Sergey Brin's net worth rose over $18 billion in one week as their firm unveiled a revamped search engine, according to Bloomberg Billionaires Index. Page's net worth rose $9.4 billion to $106.9 billion while Brin's rose $8.9 billion to $102.1 billion in their biggest weekly gain since February 2021. They're both among 2023's biggest gainers.