The Forbes Real-Time Billionaires List shows that, as of the close of U.S. markets that day, Elon Musk’s personal wealth was approximately $789.5 billion, down $79.3 billion in a single day.

The Bloomberg Billionaires Index, meanwhile, shows Musk’s personal wealth at $785 billion, down $79.7 billion in a single day.

That day, Tesla shares closed down 10.77%, while SpaceX shares closed down 9.05%.