We measure flow diversification in mutual funds using the cross-sectional correlation of daily flows across investor clienteles. Greater flow diversification is associated with lower future flow volatility, smaller subsequent outflows, and lower cash holdings. We decompose flow correlation into predictable and unexpected components. Unexpectedly low flow correlation is associated with higher post-outflow fund returns, mitigating outflow-induced externalities on incumbent shareholders. Flow diversification also dampens the higher flow-performance sensitivity of illiquid funds, partially offsetting strategic complementarities that can generate fragility.
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Wahal et al. (2026) studied this question.
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