Elon Musk net worth: Elon Musk is a South African-born entrepreneur who has a net worth of $4.5 billion. Elon Musk is an engineer and entrepreneur who began computer programming when he was 10. He sold his first commercial computer program by the time he was 12. The first company he founded, Zip2 was acquired by AltaVista for $340 million in cash and stock. He would eventually go on to co-found PayPal, SpaceX, and Tesla Motors, among other entities. When eBay acquired PayPal for $1.5 billion in October 2002, Musk's 11.7 stake was worth $1.755 billion. Elon is currently the CEO of SpaceX, SolarCity, and Tesla. Today, Elon Musk own 28% of Tesla, which as of May 2013 has a market cap of $10.66 billion. That means Elon's stake in Tesla alone is worth $2.8 billion.