JPMorgan Updates on Key Equity Indices and Nasdaq-100 Methodology Changes

JPMorgan Chase & Co. recently provided an update on key U.S. equity indices, highlighting the methodologies and recent changes to the Nasdaq-100 Index®. The Russell 2000® Index tracks the performance of 2,000 small-capitalization stocks, representing the middle 2,000 companies of the Russell 3000™ Index. This index is designed to reflect the small-cap segment of the U.S. equity market, covering approximately 99% of the market.

The S&P 500® Index consists of 500 large-cap companies, serving as a benchmark for the broader U.S. equity market. Meanwhile, the Nasdaq-100 Index® measures the performance of 100 of the largest non-financial companies listed on the Nasdaq Stock Market. Recent changes to this index include the introduction of a “Fast Entry” process for large companies, the removal of the minimum free float requirement, and adjustments to market capitalization calculations for constituent selection and weighting.

Effective May 1, 2026, Nasdaq implemented several updates, such as using ‘Full Market Capitalization’ for constituent selection and ‘Modified Market Capitalization’ for weighting. These changes also include a cap on the share count for low-float securities and quarterly rebalances in March, June, and September. The updated methodology aims to improve the index’s representation and adaptability to market dynamics.

Historical performance data shows the closing levels of these indices on October 1, 2026. The Russell 2000® Index closed at 2,806.625, the S&P 500® Index at 7,666.45, and the Nasdaq-100 Index® at a value not fully disclosed in the source. These updates and performance metrics provide a comprehensive view of the current state and recent changes in these key equity indices.