Elon Musk's businesses, including Tesla and SpaceX, had a remarkable year, boosting his net worth to over $450 billion.Tesla's market value reached above $1.4 trillion, benefiting from market buzz around AI and Musk's ties to Trump.SpaceX's valuation nearly doubled to $350 billion with technological breakthroughs in rocket and spacecraft innovation.Musk's AI company, xAI, achieved a post-money valuation of $50 billion, while his social media venture X faced challenges.