U.S. spot Bitcoin ETFs returned to net inflows on Sept. 17 after two consecutive trading days of heavy withdrawals, with BlackRock’s iShares Bitcoin Trust (IBIT) drawing about $184 million and driving most of the rebound.
Based on the latest tally cited in the report, spot Bitcoin ETFs in the U.S. still recorded a combined net outflow of about $587 million over the three trading days from Sept. 15 to Sept. 17. Even so, the earlier streak of continuous outflows has now been broken.
Bitcoin moved back toward the $77,000 area at the same time. CoinGecko data cited in the report showed BTC at about $77,332, up roughly 1.3% over the past 24 hours, with a market capitalization of about $1.55 trillion and 24-hour trading volume near $24.6 billion.
Two sessions erased $746 million before Sept. 17 brought relief
ETF flow swings were sharp across the week. Data from Farside Investors showed that U.S. spot Bitcoin ETFs posted net outflows of $450.4 million on Sept. 15, one of the largest single-day withdrawal totals since late June.
On that day, Fidelity’s FBTC saw $214.8 million in outflows, while BlackRock’s IBIT lost $161.7 million. GBTC, ARKB and BITB also recorded redemptions.
Outflows narrowed on Sept. 16, but the market still lost another $295.9 million. IBIT shed $144.1 million, ARK 21Shares’ ARKB lost $84.4 million, FBTC recorded $52.7 million in outflows, and GBTC lost $18.2 million. Morgan Stanley’s MSBT was the only fund mentioned in the report to post a net inflow, at about $3.5 million.
That left the two-day net outflow at $746.3 million, which is why the turnaround on Sept. 17 drew close attention.
IBIT flipped from two days of outflows to a $184 million inflow
The key shift came from IBIT. The fund recorded outflows of $161.7 million on Sept. 15 and $144.1 million on Sept. 16, bringing the two-day total to about $306 million withdrawn.
According to the latest ETF flow tracking cited in the report, IBIT then swung to a net inflow of about $184 million on Sept. 17. That reversal stood out even more than the aggregate market turning positive because IBIT remains the largest U.S. spot Bitcoin ETF by size.
The report said IBIT held about 784,500 BTC, worth close to $60 billion at current prices, equal to around 3.74% of Bitcoin’s 21 million maximum supply. In practice, a clear change in subscription and redemption direction for that single BlackRock product can materially move the daily total for the entire U.S. spot Bitcoin ETF market.
The outflow streak has ended, but the gap created over the prior two sessions remains large. The next question for the market is whether Sept. 17 was simply dip buying or the start of renewed institutional allocation.
Bitcoin recovered toward $77,000 as ETF flows turned positive
Bitcoin prices also rebounded as ETF flows improved. CoinGecko data in the report showed BTC at about $77,332, up around 1.3% over 24 hours, with total market value at roughly $1.55 trillion.
Looking back over the week, though, Bitcoin remained volatile. When ETF outflows reached $450 million on Sept. 15, BTC briefly dropped into the $75,000 range. The report said that day’s ETF redemptions came alongside an about 2.5% decline in Bitcoin, while stalled progress for a U.S. congressional crypto market structure bill added pressure to risk assets. BTC later recovered into the $76,000 to $77,000 range.
That left the market with a fresh signal to watch: price stabilized first, and ETF flows only turned positive after that. If inflows continue over the next few trading sessions, it would offer a clearer read on whether traditional finance demand is returning.
IBIT remains the main window into institutional ETF positioning
IBIT’s importance goes beyond one day of flow data. Long-term data from Farside, as cited in the report, showed that since listing in 2024, IBIT has accumulated more than $63.8 billion in net inflows, far ahead of other U.S. spot Bitcoin ETFs. FBTC has brought in about $10.1 billion over the same period, while GBTC has seen cumulative outflows approaching $27.8 billion after converting from its earlier trust structure into an ETF.
That has left the U.S. ETF market highly concentrated. The report said 13 U.S. Bitcoin ETFs together hold about 1.259 million BTC, equal to around 6% of Bitcoin’s maximum supply, with a total value near $96 billion. IBIT alone accounts for about 784,500 BTC, well above FBTC’s 173,700 BTC and GBTC’s 127,500 BTC.
For that reason, IBIT’s swing from two straight sessions of heavy withdrawals to a one-day inflow of roughly $184 million at least shows that the largest pool of ETF capital has not kept moving out in one direction.
JPMorgan says one positive day is not enough
JPMorgan warned that institutional investors remain more cautious on Bitcoin than on gold, and that a single day of positive ETF flows is not enough to say institutions have broadly turned bullish again.
According to the bank’s latest research cited in the report, both Bitcoin ETFs and gold ETFs have attracted returning flows since late July. Gold ETFs, however, have already recovered all of their earlier outflows this year, while Bitcoin ETFs have regained only about half. The report also said short positioning in IBIT remains near this year’s highs, and the options market’s put-to-call open interest ratio is still above that of SPDR Gold Shares (GLD).
JPMorgan said this suggests institutional demand for hedging in Bitcoin remains clearly higher than for gold. A decline in IBIT short and hedging positions would be needed to offer more support for BTC.
The latest $184 million inflow is a positive shift, but on its own it does not prove that institutional risk appetite has fully turned.
What the market is watching next
Bitcoin ETFs had only recently gone through one of their strongest funding stretches of the year in early September. On Sept. 3, daily net inflows reached $730.8 million, followed by another $174.6 million the next day. Demand then faded quickly, before combined redemptions of $746 million hit again on Sept. 15 and Sept. 16.
The pattern suggests institutional capital is not moving in one direction. It remains sensitive to price action, macro conditions and policy headlines.
The more important issue now is not how much IBIT bought in one session, but whether the next several trading days bring sustained subscriptions into IBIT, broader positive flows across other ETFs, and a renewed push by BTC above the $78,000 to $80,000 range.
If inflows appear only in IBIT while other funds continue to face redemptions, the move may reflect reallocations between ETFs. If the whole ETF market returns to a run of net inflows, that would offer a clearer sign of recovering institutional demand.