Elon Musk's entrepreneurial journey began with co-founding of Zip2 in 1995, which he sold for $307 million in 1999. Musk then founded X.com, which later merged with Confinity, firm behind PayPal. Musk founded SpaceX in 2002 and joined Tesla in 2004. In 2022, Musk acquired Twitter and in 2023, he launched xAI. With SpaceX IPO, he became world's first trillionaire.