Vol. 21, No. 4, 2023
James X. Xiong, Thomas M. Idzorek and Roger G. Ibbotson
U.S. active equity mutual funds have experienced net outflows since around 2006. The AUM-weighted performance remains similar over time, but equal-weighted performance (which emphasizes small AUM active funds) has deteriorated. Inflows/outflows contribute to the over/underperformance of individual active funds. We estimate that the flow-impact on annualized alpha for aggregated active funds industry was a positive 0.33% between 1/1991 and 12/2005, but it was a negative −0.10% between 1/2006 and 9/2021. If the current flow trend continues, the AUM of active mutual funds will drop to 17% of the total AUM of equity funds after 15 years.
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