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.

The slowdown in ETF demand is becoming more consequential as Bitcoin struggles to extend its recovery.