Zuckerberg lost $8.9 billion in a day as Meta's AI rally cracked: his net worth fell from $266.4 billion to $257.5 billion as Meta shares dropped about 4% to $749.26 after Goldman Sachs warned AI spenders need about $300 billion a year in AI reven

Mark Zuckerberg lost $8.9 billion in a day as Meta stock dropped 4% following a Goldman Sachs report warning AI spenders need $300 billion to break even.