Musk’s fortune rose by $ 6.07 billion on Friday, Bloomberg News said, following a 10.8% jump in the electric carmaker’s stock.
Buffett’s net worth dropped earlier this week when he donated $ 2.9 billion in Berkshire Hathaway stock to charity, the report added.
Tesla’s shares have surged 500% over the past year as the company increased sales of its Model 3 sedan.
The blistering rally also puts Musk in reach of a payday potentially worth $ 1.8 billion, his second jackpot from the electric car maker in about two months.
The stock is up about 38% since the close on July 1, a day before the company reported its quarterly delivery numbers.
Tesla’s solid delivery numbers heightened expectations of a profitable second quarter, which would mark the first time in its history that it would report four consecutive quarters of profit.