Billionaire-controlled companies have returned almost twice the average market performance over the past 15 years, new research published today reveals.This is one of the findings of the annual UBS and PwC Billionaires Insights report, The Billionaire Effect. The report also reveals that, more broadly, billionaires’ wealth dipped by USD 388 billion in 2018, following five years of growth.Asia’s billionaires saw a correction following five years of significant growth, during which their wealth almost quadrupled. By contrast, the Americas saw a slight wealth increase this year, led by prominent US tech billionaires. Despite slowing growth last year, billionaire wealth is over a third higher (34.5 percent) than five years earlier, amounting to an increase of USD 2.2 trillion.