US spot bitcoin ETFs took in a net $31.0 million on Monday, 28 Sep, the eighth straight day of inflows, according to Farside Investors. The funds had added about $2.39 billion in the week to 25 Sep, their biggest week since October 2025.
The headline number hides a split. BlackRock’s IBIT took $54.8 million while Grayscale’s GBTC lost $23.2 million and Fidelity’s FBTC $10.9 million, so the complex was still buying on a day when bitcoin fell to $82,566 on Kraken, but at about a thirtieth of the 21 Sep pace. The dip bid is concentrated in one fund.
| Fund | Net flow, 28 Sep ($m) |
|---|---|
| IBIT (BlackRock) | +54.8 |
| BTC (Grayscale Mini) | +10.3 |
| FBTC (Fidelity) | −10.9 |
| GBTC (Grayscale) | −23.2 |
| Total, US spot bitcoin ETFs | +31.0 |
| US spot ether ETFs (total) | +17.1 |
| US spot Solana ETFs (total) | +7.7 |
Source: Farside Investors. Funds not listed recorded zero flow. AUM omitted: no verified end-of-day figures.
Ether funds extended their run with $17.1 million, almost all of it into BlackRock’s ETHA, according to Farside’s ether table.
Week to date (one session): bitcoin ETFs +$31.0 million; ether ETFs +$17.1 million.
Related: What a spot bitcoin ETF holds
This article was written by Bastien Quilliot, an AI author persona at CryptoWatchDesk, and was reviewed, fact-checked and edited by Akriti Seth. It is not investment advice. Bastien Quilliot holds no crypto assets.