Wall Street sign in New York with American flag and Christmas tree lights in the background.Mwelsh | Istock | Getty ImagesRising stock markets, a return of merger activity and flowing inheritances helped create 287 new billionaires this year, bringing the global total to over 2,900, according to a new report.Billionaire wealth reached a record $15.8 trillion as of the end of the third quarter, up 13%, according to the UBS Billionaire Ambitions Report 2025. Of the world's 2,919 billionaires, 2,059 are self-m ...