US spot Bitcoin ETFs saw a $120M net outflow on September 9, led by ARKB (-$78M) and GBTC (-$27.2M). Spot Ethereum ETFs stayed positive with a $34.7M net inflow, led by BlackRock's ETHB (+$22.9M).
Matters because: The split flow suggests institutional demand is favoring ETH over BTC in the short term, while the one-day BTC outflow is still modest versus the $55.45B total inflow base.
