Heterogeneous Effects of Decomposed ETF Flows on Benchmark-Adjusted Returns: Evidence across ETF Classifications

Nayef Alkabbaa

Research

50 Pages

The authors examine whether ETF flows actually say anything useful about future benchmark-adjusted returns. Using 424 U.S. equity ETFs from 2000 to 2023, they find that flow effects depend heavily on ETF structure, market volatility, and whether the flows reflect demand, arbitrage, or unexplained activity.

Key Takeaways

ETF Structure Matters: Demand flows were linked to a 12.8 basis point annual alpha drag for Index ETFs, but a 3.2 basis point gain for Sector Active ETFs.
Smart Beta Crowding: Smart Beta demand flows showed a 5.9 basis point annual alpha drag, while 2SLS cut the estimated effect by 61%.
Arbitrage Changes In Stress: High volatility arbitrage interactions reached 54.5 basis points for Sector Index ETFs and 17.7 basis points for Smart Beta ETFs.
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