Is Nvidia Stock a Buy in September 2026?

Nvidia has transformed into an AI infrastructure powerhouse with extraordinary growth (106% YoY revenue increase), expanding beyond GPUs into complete AI systems. While the company is well-positioned for the next phase of AI (inference and agents), the stock trades at a 29x P/E ratio with limited margin of safety. Investors should only buy if they have strong conviction on AI's sustainability and Nvidia's dominance, despite visible competitive risks from major customers developing proprietary chips.