SpaceX's valuation has reached $350 billion through secondary stock sales, showcasing its strong financial position amid Musk's increasing wealth, surpassing $400 billion. The company continues to dominate the satellite launch market and develop its Starship rocket. Musk's financial gains are intertwined with SpaceX's success, as he holds a 42% stake. The rise in valuation reflects growing investor confidence and the company's significant contracts, bolstered by its advancements in satellite internet and reusable rocket technologies.