Nvidia has become the largest single stock in the MSCI All Country World Index (ACWI), reaching a weight of 5.21% as of early October 2026. This global benchmark tracks 2,414 companies across 23 developed and 24 emerging markets, representing a significant portion of passive investment capital.
The company's influence in the index has grown steadily from approximately 3% in 2023 and over 4% in 2024. By September 2026, Nvidia's float-adjusted market capitalization reached about $5.25 trillion. The firm currently holds an estimated 80% market share in key AI accelerator segments.
Nvidia's current index weighting now exceeds the combined weight of France and Germany. It also surpasses the total weight of Japan, a threshold the company first crossed in April 2026. For investors in funds like the iShares MSCI ACWI ETF, Nvidia consistently ranks as the largest position.
The concentration of a single stock exceeding 5% of the index introduces new risks for passive investors. While the company's growth has amplified returns, any volatility in Nvidia's share price now has a more pronounced impact on global portfolios, comparable to economic shifts in mid-sized nations.
