Yahoo Finance·2025-10-01 12:45Core Insights - The article discusses the unprecedented concentration of large-cap stocks, specifically Nvidia, Apple, and Microsoft, in the S&P 500 and Nasdaq-100 indices, highlighting their significant market capitalizations and influence on the overall market [2][3]. Company Analysis - Nvidia is currently the largest company by market capitalization, valued at approximately $4.5 trillion, and is on track to reach $5 trillion [4][5]. - Nvidia's stock has recently hit an all-time high, indicating strong performance and suggesting that its continued growth is essential for the broader S&P 500 index's upward trend [5]. - Microsoft, the second-largest company by market capitalization, exhibits a similar stock pattern to Nvidia, although it remains 7% below its all-time high [6].