Oracle co-founder Larry Ellison's $1 billion stake in his friend Elon Musk-led Tesla is now worth over $1.6 billion after the stock surged 25% in 2020. Ellison had revealed he bought 3 million shares of Tesla before joining Tesla's board in December 2018. At the time, the stake was worth $1 billion, making Ellison Tesla's second-biggest individual investor after Musk.