New Delhi, Oct. 7 -- Elon Musk has crossed the $1 trillion wealth mark again, only months after becoming the world's first trillionaire and then watching his fortune fall sharply. This time, a surge in SpaceX shares has done much of the work, with Tesla also adding to the rebound.

According to Forbes' real-time billionaires data cited by Fortune, Musk's net worth climbed to about $1.04 trillion on Monday, 05/10. His fortune increased by roughly $65 billion in a single day as SpaceX shares jumped nearly 8 per cent.

The move shows just how quickly Musk's estimated wealth can change. Much of his fortune is tied to companies he owns or controls, meaning a strong trading session can add tens of billions of dollars to his paper wealth without...