CryptoBriefing and CoinDesk both cover Sept 21 spot Bitcoin ETF inflows totaling roughly $999M, but give conflicting figures for how much of that went to BlackRock's IBIT.
What all sources agree on
- US spot Bitcoin ETFs recorded net inflows of approximately $999 million on September 21.
- BlackRock's IBIT led the day's inflows among spot Bitcoin ETFs.
- Bitcoin's price rose during this period, with CryptoBriefing citing levels above $81,000 and CoinDesk citing a rise to $85,000 this quarter.
Where the reports disagree
1Amount BlackRock's IBIT took in on September 21
IBIT alone attracted approximately $618 million, a figure that puts it comfortably ahead of the rest of the field.
BlackRock's IBIT led Monday's inflows with $381.37 million, followed by Ark's ARKB with $289.12 million and Fidelity's FBTC with $238.84 million.
What would settle it: BlackRock's official daily fund flow disclosure or the underlying SoSoValue/Farside ETF flow data for September 21.
2Whether the ~$999M figure covers Bitcoin ETFs alone or Bitcoin plus Ether ETFs combined
US spot Bitcoin and Ether ETFs pulled in a combined $1.269 billion in net inflows on that single trading day, with BlackRock's iShares Bitcoin Trust leading the charge.
U.S.-listed spot Bitcoin exchange-traded funds drew a net $998.95 million on Monday, their largest daily inflow since bitcoin reached a record high on Oct. 6, 2025.
What would settle it: SoSoValue or Farside's separated daily flow tables for spot Bitcoin ETFs versus spot Ether ETFs on September 21.
What to make of it
Treat the roughly $999 million total spot Bitcoin ETF inflow figure for September 21 as broadly agreed, but do not rely on either outlet's specific IBIT dollar amount ($618 million vs. $381.37 million) until checked against the underlying fund flow data.
Treat the roughly $999 million total spot Bitcoin ETF inflow figure for September 21 as broadly agreed, but do not rely on either outlet's specific IBIT dollar amount ($618 million vs. $381.37 million) until checked against the underlying fund flow data.