Such concentration suggests institutions view BlackRock as the safest custody route. This centralization of flows has two readings: widespread institutional adoption, or overdependence on a single provider.
Spot ETFs exist only for Bitcoin and Ethereum. Altcoins see no institutional ETF capital, leaving smaller caps vulnerable to retail-only price discovery and volatility.
Periods of extreme ETF concentration often precede volatility. When one player dominates inflows, sudden redemptions can trigger sharp selloffs without competing bid support.
As of August 28, 2026, watch whether BlackRock's dominance continues or other providers (Fidelity, iShares competitors) claw back share. Dominance above 70% is historically unsustainable.
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