Elon Musk has become the first person with a $500 billion net worth, driven by Tesla’s stock surge and SpaceX’s $400 billion valuation. His 12% Tesla stake is worth $191 billion, while xAI Holdings adds $113 billion. Rising from $24.6 billion in March 2020, Musk could become the first trillionaire by 2033, tied to Tesla’s performance-based pay. He stresses Tesla influence for robotics safety.