U.S. spot Bitcoin exchange-traded funds have pulled in about 5.3 billion USD since the Treasury Department announced larger long-dated bond buybacks in August, according to ETF analyst Nate Geraci — a rebound that has pushed 2026 flows back into positive territory for the first time since May.
By Marcus Johnson | September 27, 2026
The Hook: From a 5.8 Billion USD Hole to Positive Territory
The first seven months of 2026 were rough for Bitcoin ETFs. By mid-July, the funds were sitting roughly 5.8 billion USD underwater on a year-to-date basis, with separate calculations putting the low near negative 5.69 billion USD around July 13. Institutional appetite appeared exhausted, and Bitcoin itself spent months under pressure.
What a difference ten weeks make. In a September 26 post, Nate Geraci of The ETF Store reported that spot Bitcoin ETFs have now collected approximately 5.3 billion USD since the Treasury first signaled it would increase buybacks of long-dated bonds — including 2.4 billion USD in the week ending September 25 alone. Year-to-date net flows have swung back to roughly 934 million USD positive.
The Policy Connection: What Treasury Actually Did
On August 19, the U.S. Treasury announced it would increase the maximum size of liquidity-support buybacks involving longer-dated nominal Treasury securities. Operations covering the 10-to-20-year and 20-to-30-year sectors were raised from a maximum 2 billion USD to at least 4 billion USD each. The larger operations took effect September 9 and are scheduled to remain in place through November 4.
Treasury said the move was intended to provide more liquidity in long-dated government bond markets, citing consistently strong offers from market participants. The announcement coincided with falling long-term yields — the 30-year Treasury yield declined after reaching a 19-year high — and stronger prices across risk assets.
Geraci linked the timing of the ETF recovery to that policy announcement. An important caveat he and others stress: the 5.3 billion USD figure describes two things that happened over the same period. It does not prove the buybacks caused investors to allocate money to Bitcoin funds. Correlation is the observation, not the verdict.
The Numbers: A Week for the Record Books
The strongest stretch came during the September 21-25 trading week, when U.S. spot Bitcoin funds drew approximately 2.39 billion USD over five consecutive positive sessions, according to Farside Investors data — the largest weekly total since October 2025.
- Monday: about 999 million USD — the strongest daily total of 2026 and the ninth-largest single-day inflow since the funds launched in January 2024, according to SoSoValue figures cited by The Block.
- Tuesday: 714.7 million USD
- Wednesday: 346.9 million USD
- Thursday: 190.7 million USD
- Friday: 134.5 million USD
BlackRock’s iShares Bitcoin Trust (IBIT) led the week with roughly 1.16 billion USD in net inflows. Fidelity’s FBTC attracted 701.6 million USD, ARK 21Shares’ ARKB added 294.7 million USD, and Morgan Stanley’s MSBT took in another 203.3 million USD — its largest weekly intake since the fund launched in April. Cumulatively, the funds now hold approximately 57.6 billion USD in net inflows since launch, with total net assets near 108.4 billion USD at the end of Friday.
The turnaround was not a straight line. During the September 14-18 week, Bitcoin ETFs finished with only about 6.1 million USD in net inflows after losing a combined 746.3 million USD on Tuesday and Wednesday. Flips in direction — like the 159.5 million USD that entered on September 17 after the Federal Reserve meeting — have punctuated the recovery.
What This Means for Bitcoin Investors
Bitcoin’s price has told a similar story. BTC moved above 87,000 USD early in the week, reaching roughly 87,363 USD, before retreating toward 84,000 USD by September 26 — it trades near 84,883 USD at the time of writing, according to CoinGecko data, still up around 3.8% over seven days. The total crypto market value stands close to 2.98 trillion USD.
Why should a regular Bitcoin holder care about ETF flows? Because these funds are now among the largest marginal buyers of Bitcoin in the world. When institutional money pours in through ETFs, it absorbs available supply — which supports price. When it exits, the effect reverses. The 2026 flows flipping positive removes a persistent overhang that weighed on price all summer.
The Treasury connection adds a macro layer worth watching. If falling long-term bond yields make risk assets more attractive, and Bitcoin ETFs become a vehicle for that rotation, the November 4 expiration of the expanded buyback window is a date to circle. If inflows fade after it, skeptics will say the correlation was coincidence. If they persist, Geraci’s observation starts looking like a trend.
The Verdict
The hard numbers are unambiguous: 5.3 billion USD in ETF inflows since August 19, a five-day streak worth 2.39 billion USD, and 2026 flows back above water. Whether credit belongs to Treasury policy, broader risk appetite, or simply Bitcoin finding a bottom, the institutional bid has returned — and for now, it is the strongest it has been all year.
The cryptocurrency market remains highly volatile. This article is for informational purposes only and does not constitute financial advice.
From a 5.8 billion hole to positive in two months. The August buyback announcement really was the turning point nobody priced in.
nobody priced it in lol, half the timeline was calling for 40k by september
5.8 billion underwater in july to positive YTD now. whoever kept buying while everyone screamed outflows is eating very well
the july 13 low near minus 5.69B was the actual max pain mark. flows almost always flip near local bottoms
attributing the whole ETF flip to treasury buybacks feels like narrative glue. maybe bitcoin just got cheap and buyers showed up
does the 5.3B include the new institutional share classes or just the base funds? geraci usually specifies that
minus 5.8B to green in ten weeks. respect
Geraci has been right on the flow picture all year. Still want to see whether inflows stick once the buyback news is fully digested.