Overview
- U.S. spot Bitcoin and Ether ETFs recorded a large single‑day net inflow on Sept. 21 that sources put between about $998.95 million and $1.269 billion, reflecting differences in data providers’ tallies.
- BlackRock’s iShares Bitcoin Trust captured the largest share of that day’s inflows, though outlets disagree on the amount with SoSoValue‑based reports showing about $381.4 million and other tallies attributing roughly $618 million to IBIT.
- Total assets under management for U.S. spot Bitcoin ETFs have climbed above $100 billion, with one estimate reporting roughly $102.5 billion to $105.6 billion by late September 2026.
- Bitcoin’s recent rally tracked with the flows, leaving the coin up sharply for the quarter and trading in the low‑to‑mid five‑figure range per coverage, while ETF creations and redemptions continue to produce notable short‑term price swings.
- Analysts say concentrated issuer leadership and volatile daily creations make flows a key market driver, and they warn that rising Treasury yields, recent Fed policy moves, and stalled U.S. crypto legislation could prompt further rebalancing or redemptions.