That reverses roughly $5 billion of net outflows in the second quarter, a swing of more than $11 billion between the two periods.
Bitcoin gained 42.71% over the quarter, its strongest since the fourth quarter of 2024 and its best third-quarter performance since 2017, per CoinGlass.
The Monthly Pattern Shows Momentum Fading
The quarter was front-loaded in its second half and is now decelerating.
July delivered $172 million. August brought $3.52 billion. September closed with $2.65 billion — down about 25% from August.
That ordering matters more than the quarterly total. A quarter that builds and then eases describes demand that arrived in response to price rather than demand that drove it.
September also ended weakly. Bitcoin ETFs recorded roughly $149 million in net outflows on Wednesday, snapping a nine-day inflow streak that had attracted about $3.1 billion.
The Flows Sit Against a Weaker Demand Signal
ETF inflows are one measure of spot demand, not the only one.
CryptoQuant estimates Bitcoin's overall spot demand shrank by about 170,000 BTC over the 30 days to Tuesday, a figure that deteriorated from −145,000 BTC on September 11 while price rose.
The two readings are compatible. ETFs absorbed capital while other holders distributed, meaning the regulated vehicles were buying from sellers elsewhere rather than adding to net demand.
Glassnode's HODL Waves data adds a third piece. Long-term holders — coins unmoved for at least 155 days — now account for 80% of supply, an all-time high, up from 65% a year ago.
Existing holders are not selling. New demand is arriving through ETFs. Neither of those explains a 42.71% quarterly gain on its own, and short liquidations supplied a substantial part of the September move.
Ether Funds Delivered a Larger Proportional Reversal
US spot Ether ETFs attracted about $3.05 billion in Q3 after roughly $714 million of outflows in Q2.
Ether gained about 71% over the quarter, its best since the first quarter of 2021.
The ratio is the interesting part. Ether's ETF complex drew about 48% of what Bitcoin's did while delivering 66% more price appreciation — so ETF flows explain less of ether's move than of Bitcoin's.
That is consistent with the broader rotation. CoinMarketCap's altcoin season index has held above 60 for five consecutive days at 61/100, a level not reached in more than three months.
Altcoin Funds Are Building Smaller Positions
XRP ETFs attracted $308 million in Q3, lifting cumulative net inflows to $1.79 billion.
Solana ETFs drew $272 million in September and Zcash ETFs $246 million.
The Zcash figure is the standout relative to its market size. ZEC gained 130% over 30 days and reached a record near $1,488, and a single US fund has now pulled in substantial flows in its first months — including a $47 million day in mid-September when the broader complex was losing money.
Privacy has been the quarter's most durable sector trade, and the ETF flows confirm institutional participation rather than purely retail speculation.
What the Fourth Quarter Faces
Bitcoin's fourth quarter has historically been its strongest. Since 2013 it has averaged a 77% gain with a median of 47.7%, though the gap between those figures shows the average is pulled by a small number of extreme quarters.
The macro setup is less supportive than the seasonal record.
The 10-year Treasury yield reached 5.30% on Wednesday, its highest since 2002, and the 30-year touched 5.65%. Both reversed earlier declines that followed softer-than-expected August PCE data, which showed headline inflation at 3.4% and core at 3%.
Bitfinex analysts identify real yields as the specific pressure, with the 10-year inflation-adjusted yield climbing to 2.83% from 2.68% in the week to September 25.
Friday's non-farm payrolls report is the next test, with Kalshi pricing nearly 60% odds of a figure above 90,000 against Goldman Sachs at 80,000 and Bank of America at 60,000.
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