Bitcoin ETFs' biggest week since October, and an unconfirmed tie to Treasury's bond buybacks

Bitcoin ETFs pulled in $2.4 billion over the week ending Sept. 25 — their biggest weekly haul since October 2025 — and pushed their 2026 year-to-date flow positive to $934.1 million, The Block reported Sept. 26 (Zack Abrams, 1:24 p.m. EDT), citing SoSoValue data.

That rebound has, this week, attached itself to a specific narrative: Nate Geraci, co-founder of the ETF Institute, posted on X on Sept. 26 that bitcoin ETFs have taken in "$5.3bil since Treasury Dept first said it would increase buybacks of long-dated bonds." Crypto.news's own article embeds that post directly, which let this piece read its exact wording firsthand even though X's own site returned an HTTP 402 error on every direct fetch attempted here. The same post gives the $2.4 billion figure for last week and the roughly $1 billion Monday inflow, and adds that 2026 flows are now positive after a $5.7 billion hole in July — consistent with The Block's independently sourced numbers. A separate, earlier Geraci post uses the same $5.3 billion figure to describe seven days of inflows with no mention of Treasury at all; that one is dated Oct. 8, 2025, nearly a year before this news cycle, and is not the source of this week's claim.

Key points

• The Block's report also puts Monday's $999.0 million single-day inflow as the ninth-largest since the funds launched in January 2024, cumulative inflows since launch at $57.6 billion, and total net assets at $108.4 billion as of Friday; BlackRock's IBIT led the week with about $1.2 billion.
• Treasury said Aug. 19 it would raise the maximum size of its liquidity-support buybacks of 10-to-20-year and 20-to-30-year nominal coupon bonds from $2 billion to at least $4 billion per operation, with larger operations beginning Sept. 9 and running through the Nov. 4 refunding; Treasury's release credits the change to steady, strong demand from dealers and investors in those operations.
• Bitcoin ETF flows had bottomed at a 2026 year-to-date low of negative $5.69 billion on July 13, according to Farside Investors data cited by CoinMarketCap Academy's Alex O'Donnell — the hole this week's inflows helped close.
• Bloomberg's Eric Balchunas, cited in The Block's report, separately linked roughly $4.6 billion of inflows to the Treasury buyback announcement — a different subtotal than Geraci's $5.3 billion, with neither source spelling out a shared start date or window that would let the two be reconciled.
• A write-up of Geraci's post at Hokanews reads it as a timing observation rather than a causal one: the outlet's own account is that Geraci never showed the buybacks caused the inflows, only that the two lined up.
• Farside Investors' own flow table returned an access error on a direct fetch attempt for this piece; the July 13 figure above is sourced instead through CoinMarketCap Academy's citation of it.

Why it matters

The inflow numbers here are the least disputed part of the story: The Block's SoSoValue-sourced figures describe money that has already moved, and Geraci's own post, read directly, largely agrees with them. What remains unresolved is the mechanism connecting them to Treasury. Geraci's $5.3 billion and Balchunas's $4.6 billion cover the same general stretch without a shared start date, and even Hokanews's own account treats the Treasury connection as a coincidence in timing, not a demonstrated cause. The two events, buybacks and inflows, line up on a calendar. Nothing found here shows they line up on mechanism.

This is an AI-written summary of the sources credited above and linked in the text, read and edited by Nicholas before publishing. The facts and the quote belong to those sources; the wording is ours. Read the original.