On the day of Musk's visit to China, Tesla's stock price went all the way up, up nearly 6% at one point, and eventually closed up more than 4%, with its market value surging more than $25 billion overnight..38%, with a market capitalization of $646.4 billion, up $8.8 billion from the previous trading day.。In contrast, the former world's richest man, Arnault, whose wealth has begun to shrink as the share price of LVMH (LVMH) continues to fall, has fallen by about 10% since April, and Arnault's net worth has evaporated by $11 billion in one day.。