Elon Musk, the richest of the rich, conquers the throne of the world's first billionaire

SpaceX's IPO, the largest in history, cemented the South African entrepreneur's position as the first billionaire in history and propelled SpaceX into the ranks of the most valuable companies on the planet, even though the company posted losses of nearly $5 billion last year and generated only a fraction of the revenue of similarly valued tech giants.