US spot bitcoin ETFs pulled in $986.9 million in net inflows last week, their third consecutive week of positive flows, as institutional demand rebuilt around the asset after a choppy summer. BlackRock’s IBIT led all funds with $691.5 million for the week ended September 4, according to SoSoValue data.
The weekly total rose from $924.5 million the prior week. Ether ETFs also stayed positive, taking in $218.4 million for their own third straight week of inflows, though their trading volume slipped to $4.1 billion from $6.3 billion the week before. Bitcoin fund volume fell to $14.5 billion from nearly $19 billion, a sign that the money arriving is staying put rather than churning.
August set the base
The streak follows a strong August. Spot bitcoin ETFs drew $3.52 billion in monthly net inflows, their largest positive month since September 2025, while ether funds brought in $1.85 billion, their best month since August 2025. The daily numbers show how uneven the path was. After $236.5 million left the funds on September 1, with IBIT alone shedding roughly $201 million, flows flipped back the next session with about $101 million of net buying, and September 3 delivered $730.9 million, the biggest single-day haul since mid-January. Friday added another $174.6 million, leaving September’s month-to-date total at $770.2 million across just four trading days.
Combined net assets across US spot bitcoin ETFs now stand above $103 billion, about 6.32% of bitcoin’s total market capitalization. IBIT’s cumulative net inflows since launch have reached roughly $64 billion, keeping it far ahead of Fidelity’s FBTC and the rest of the field.
| Period | Net flow | Note |
|---|---|---|
| Week of Aug 24 | +$924.5M | strong rebound after mid-August outflows |
| Week of Aug 31 | +$986.9M | IBIT took $691.5M |
| Sept 3 session | +$730.9M | best single day since January |
| Sept 1 session | -$236.5M | IBIT lost about $201M |
| August monthly | +$3.52B | best month since Sept 2025 |
Analysts see spot demand, not leverage
“Sustained ETF inflows suggest institutional capital is steadily rebuilding exposure to bitcoin, creating genuine spot demand rather than relying on leverage-driven speculation,” said Dominick John, analyst at Zeus Research, in comments to The Block.
Min Jung, research associate at Presto Research, framed the move as a catch-up trade after crypto lagged other risk assets through the summer. Bitcoin traded near $80,000 on Sunday evening, close to the $81,700 high it hit Thursday, after clearing the level that had capped its rally since late August. Ether changed hands around $2,500, and privacy coins kept running on the sidelines, with zcash holding ground above $1,200 after breaking an eight-year record earlier in the week.
Both analysts pointed to the same near-term risks. John said bitcoin will likely grind toward $82,000 to $85,000 but that the next move is macro-driven, with September 10 jobless claims and September 11 CPI as the markers to watch. Jung flagged a hot inflation print as the main downside risk to the rally. Rate expectations have been swinging hard: August payrolls of 162,000 briefly pushed odds of a Fed hike to around 60% before they eased back as markets digested the mix.
One fund sets the tone
The flow picture also has a concentration problem. IBIT has repeatedly absorbed 60% to 80% of daily sector flows, which makes one fund a de facto proxy for institutional sentiment and means a reversal in IBIT can distort readings of overall demand. That pattern played out within a single week this month: the same fund that bled $201 million on September 1 absorbed $454 million two sessions later. During the August 3 to 7 stretch, IBIT took an estimated $693 million of the sector’s $853.5 million, roughly 81% of the total.
Quarterly filings add texture to who is behind the demand. Jane Street reported more than $1 billion in US spot bitcoin ETF holdings as of June 30, with about $828 million of that in IBIT, and UBS and Jane Street together held a combined $75 million in Hyperliquid-related ETF positions according to Bloomberg reporting this week.
For now, the direction holds. Three weeks of net inflows, a record August and price back above $80,000 give the market its most constructive stretch since spring. The structure stays constructive as long as $80,000 holds, in John’s words, but the calendar does the deciding next: claims on Wednesday, CPI on Thursday, and a Fed decision shadow hanging over both.
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