Louis Vuitton owner LVMH's Chairman Bernard Arnault, the world's fourth-richest person, added $4.3 billion to his fortune on Wednesday. Shares of his Paris-based luxury-goods maker surged 6.9%, the most since mid-2016, after its fourth-quarter profit beat estimates. Arnault's wealth has surged $8.3 billion since the start of the year and now stands at $76.9 billion, according to Bloomberg.