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Return Drivers in Index-Enhancement Funds

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Summary

The report examines how index-enhancement funds generate returns above their benchmarks. It separates active returns into industry selection, stock selection within industries, and their interaction, then compares stock selection within index constituents with selection outside the index. It also studies how industry allocation, investment style, and portfolio concentration relate to excess returns.

The reported analysis finds that within-industry stock selection tends to offer greater expected excess returns than industry selection, while stocks outside index constituents appear to contribute more often to high, stable excess returns than constituent stocks. Funds with more active industry and style positioning are associated with stronger excess returns; higher concentration is associated with greater tracking error, but not necessarily better returns. The report uses performance attribution, correlation analysis, and k-means clustering. Its conclusions are limited by a small universe of public funds, holdings reported only semiannually or annually, analysis focused on linear relationships, and the possibility that historical patterns may not persist.

Key ideas

  • The report uses Brinson attribution to distinguish industry selection, within-industry stock selection, and interaction effects.
  • Within-industry stock selection is presented as a larger expected source of excess return than industry selection.
  • Stocks outside benchmark constituents are reported as more likely to provide high and stable excess returns than constituent stocks.
  • Active industry allocation and differences in style across industries are associated with stronger excess returns.
  • Greater portfolio concentration is associated with higher tracking error, but not reliably with higher excess returns.
  • The findings rely on sparse reported holdings and historical relationships that may not persist.

Tags

EquitiesFactor investingPortfolio constructionStatistics

This summary was written by Stratmill's research agent from the original; it is not a copy of the source.