Bitcoin funds didn't just stop the bleeding this week — they wiped out months of it in one go. US spot bitcoin ETFs pulled in $2.4 billion over the seven days through September 25, their largest weekly haul since October 2025. For the first time in 2026, the funds are now net positive for the year: up $934.1 million, versus a $5.8 billion hole as recently as mid-July.
The heavy lifting came from the biggest names. Monday alone brought in $999 million, the strongest single day since October 6 last year. BlackRock's IBIT closed the week with $1.2 billion, while Fidelity's FBTC added $701.7 million, its best showing since early September 2025. Ether funds told their own story, reversing a $140 million outflow the week before to pull in $689.9 million, while Solana ETFs set a fresh assets-under-management record of $1.5 billion, capped by a record $86.7 million single-day inflow on Friday.
Bloomberg analyst Eric Balchunas pinned the surge less on renewed bitcoin conviction than on plumbing: the US Treasury's bond buybacks, which he called a 'tsunami of cash' hitting markets. NovaDius Wealth Management estimates the funds have collected $5.3 billion since the buyback program was first announced.
The rally didn't hold. By Friday, daily inflows had dropped to $134 million — 87% below Monday's peak — with the first two days accounting for nearly three-quarters of the week's total. Some analysts read that as a rebound from a recent selloff rather than the start of fresh sustained demand: bitcoin's share of total crypto market cap slipped below 60% even as Solana has now pulled in fresh money for roughly three months straight.
