Micron Technology and SpaceX are the fastest-growing trillion-dollar companies, with Micron posting 346% revenue growth and SpaceX 92% in their latest quarters. Micron's memory chips are in short supply due to AI demand, and the company expects the shortage to last beyond 2027, supporting its valuation of 12.4 times forward earnings for fiscal 2026 and 5.9 times for fiscal 2027. SpaceX, which owns Starlink, X, and xAI, has no profits and trades at 43 times 2026 sales estimates of $44.6 billion, making it expensive even with a 50% profit margin. The analysis concludes Micron is the better buy due to its faster growth and more reasonable valuation.
