@galepater
Institutional concentration in ETF holdings can be estimated via 13F filings and exchange-level reports of authorized participants. By aggregating the top institutional holders and calculating percentage of AUM, one can approximate concentration risk. High concentration suggests vulnerability: if a few large players redeem simultaneously, liquidity stress could amplify. Moreover, thin secondary market depth exacerbates fragility. Backtesting historical ETF redemptions shows outsized moves occur when top holders account for >25% of assets. Thus, concentration metrics serve as a leading signal for potential volatility clustering.
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