US Bitcoin exchange-traded funds drew just $31 million in inflows on Sept. 28 as institutional demand weakened while BTC stalled below a major supply barrier.
According to SoSoValue data, BlackRock’s iShares Bitcoin Trust (IBIT) led the session with $54.84 million in inflows, adding about 657 Bitcoin and lifting its holdings back above 800,000 BTC for the first time since May 26.
Grayscale’s Bitcoin Mini Trust (BTC) added another $10.32 million, while Fidelity’s Wise Origin Bitcoin Fund (FBTC) recorded $10.90 million in outflows and Grayscale’s GBTC lost $23.19 million. The remaining products registered no net flows during the session.
The $31.07 million intake extended the positive streak for US spot Bitcoin ETFs to eight trading sessions, but it also marked the weakest day of that run.
The trend has deteriorated steadily since Sept. 21, when daily inflows approached $1 billion. Flows declined through the remainder of last week before falling to just $31 million Monday, leaving the latest total about 97% below that peak.
That slowdown contrasts with the strength of the broader weekly figures. The funds attracted $2.4 billion last week, their strongest weekly inflow of 2026 and the largest since October 2025.
The surge was enough to flip year-to-date flows back into positive territory after the funds had been roughly $5.8 billion in the red as recently as July. Moreover, the latest inflow has lifted the products’ month-to-date flows to $2.73 billion and 2026 net inflows to about $1.01 billion, according to SoSoValue.
Bitcoin stalls at heavy supply zone
The slowdown in ETF demand is becoming more consequential as Bitcoin struggles to extend its recovery.
Bitcoin traded around $84,000 after retreating from last week’s move above $87,000, bringing it back toward a price zone where Glassnode says long-term-holder supply is heavily concentrated.
According to the analytics firm, more long-term-holder coins sit between $84,000 and $85,000 than at any other level on its cost-basis distribution. That concentration could increase selling pressure as holders return to breakeven or move back into profit.
Glassnode said Bitcoin needs to break through the zone and hold above it for the rally to continue.
ETF demand has helped absorb that supply during the September advance. Glassnode said inflows supported last week’s roughly 4% gain even as perpetual-futures traders and profit-takers sold into the move.
The shrinking size of those inflows therefore leaves less institutional demand available as Bitcoin tests the supply cluster.
At roughly $84,000 per Bitcoin, Monday’s $31 million net inflow was equivalent in value to fewer than 400 BTC. By comparison, the nearly $1 billion entering the funds at the start of last week was equivalent to more than 11,000 BTC at similar prices.
ETF flows do not translate directly into an identical amount of same-day spot buying, but the comparison shows how sharply the marginal institutional bid has declined.
That puts the next several sessions in focus. A renewed pickup in ETF buying could help Bitcoin absorb supply around $84,000 to $85,000 and reopen the path higher. If inflows keep shrinking or turn negative, the cryptocurrency may struggle to clear the zone that has already stalled its latest advance.
