Key Takeaways
- Index funds comprised 50% of total U.S. equity fund AUM in 2023
- 60% of new U.S. fund inflows went to passive index products in 2023
- Retirement accounts allocated 45% to index funds by end-2023
- The index industry saw net inflows of $1.2 trillion into passive funds globally in 2023
- U.S. index ETFs recorded $800 billion net inflows in 2023, up 15% from 2022
- European passive index funds attracted €250 billion inflows in 2023
- BlackRock's iShares held 38% U.S. ETF market share in index products end-2023
- Vanguard commanded 28% share of U.S. index mutual fund market in 2023
- State Street's SPDRs captured 15% of U.S. equity ETF market share 2023
- In 2023, the global exchange-traded fund (ETF) industry, dominated by index-tracking products, managed assets under management (AUM) totaling $11.5 trillion, marking a 20% year-over-year increase
- The U.S. index mutual fund and ETF market reached $13.2 trillion in AUM by Q4 2023, representing 48% of total U.S. fund assets
- Europe's index fund industry AUM grew to €2.1 trillion in 2023, with passive strategies comprising 42% of total UCITS assets
- S&P 500 index returned 24.2% total return in 2023
- Nasdaq-100 index delivered 55.1% return in 2023, outperforming broader markets
- Dow Jones Industrial Average gained 13.7% in 2023
In 2023, passive index investing dominated flows and growth, with passive outperforming and index ETFs expanding worldwide.
Adoption and Trends
Adoption and Trends Interpretation
Growth Rates
Growth Rates Interpretation
Market Size
Market Size Interpretation
Performance Metrics
Performance Metrics Interpretation
How We Rate Confidence
Every statistic is queried across four AI models (ChatGPT, Claude, Gemini, Perplexity). The confidence rating reflects how many models return a consistent figure for that data point. Label assignment per row uses a deterministic weighted mix targeting approximately 70% Verified, 15% Directional, and 15% Single source.
Only one AI model returns this statistic from its training data. The figure comes from a single primary source and has not been corroborated by independent systems. Use with caution; cross-reference before citing.
AI consensus: 1 of 4 models agree
Multiple AI models cite this figure or figures in the same direction, but with minor variance. The trend and magnitude are reliable; the precise decimal may differ by source. Suitable for directional analysis.
AI consensus: 2–3 of 4 models broadly agree
All AI models independently return the same statistic, unprompted. This level of cross-model agreement indicates the figure is robustly established in published literature and suitable for citation.
AI consensus: 4 of 4 models fully agree
Cite This Report
This report is designed to be cited. We maintain stable URLs and versioned verification dates. Copy the format appropriate for your publication below.
Marcus Engström. (2026, February 13). Index Industry Statistics. Gitnux. https://gitnux.org/index-industry-statistics
Marcus Engström. "Index Industry Statistics." Gitnux, 13 Feb 2026, https://gitnux.org/index-industry-statistics.
Marcus Engström. 2026. "Index Industry Statistics." Gitnux. https://gitnux.org/index-industry-statistics.
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