On October 6, 2026, Nvidia reached a market capitalization of $584 billion, with its stock trading at $243.37 during intraday trading. This level suggests the company is approaching a $6 trillion market capitalization, a threshold never crossed by any listed company. Nvidia has surpassed Apple by nearly $900 billion and achieved a 28% growth in 2026, adding $1.2 trillion to its value. Jensen Huang, Nvidia's chief executive, states that the company is unique due to its combination of growth and attractive valuation, with its price-to-earnings ratio remaining reasonable. However, some analysts question the sustainability of such a concentration of value. Nvidia heavily influences American stock indices, making up approximately 13% of the Nasdaq and 8% of the S&P 500. A 10% drop in its stock price would significantly affect the Nasdaq. Index funds are heavily weighted toward Nvidia, increasing market volatility. The concentration of capital is becoming a concern: a misstep by Nvidia could shake the entire technology sector. Since the launch of ChatGPT in 2022, Nvidia has provided the graphics processing units (GPUs) needed for artificial intelligence (AI) development. Giants like Google, Amazon, and Microsoft have heavily invested in Nvidia's servers to support their AI initiatives. However, the sustainability of these investments is uncertain, given the competition and questions about the profitability of AI infrastructure. In March 2026, the stock fell 11% before rebounding, but opinions differ on its future—some predict a valuation of $10 trillion by 2028, while others fear a bubble. Nvidia's financial results are impressive: in the second quarter of 2026, revenue doubled to reach $96.2 billion, with the data center segment generating $89 billion. A share buyback program of $150 billion was launched, reflecting confidence in long-term prospects. Venture capital investments in AI exploded to $99 billion in July 2026, compared to $7 billion the previous year. Upcoming quarterly results will be crucial to assess the sustainability of Nvidia's growth. Morgan Stanley still recommends overweighting the stock, with a target at $300, while BNP Paribas has raised its target to $345. However, the central question remains: does this valuation reflect a viable economic reality or is it a speculative distortion?