[Musk's Wealth Shrinks by Nearly $80 Billion in a Single Day] According to Forbes' real-time billionaires list, as of the US stock market close on November 5th, Musk's personal wealth was approximately $789.5 billion, a decrease of $79.3 billion in a single day. The Bloomberg Billionaires Index shows his personal wealth is approximately $785 billion, a decrease of $79.7 billion in a single day. On the same day, Tesla's stock price closed down 10.77%, and SpaceX's stock price closed down 9.05%.