Bitcoin ETF inflows of $2.4B tighten supply as exchanges lose 35,800 BTC in a single week

Roughly 35,800 BTC vanished from exchange wallets last week. Not into thin air, but into ETF vaults and cold storage, the kind of places where coins go to sit quietly for a very long time. US spot Bitcoin ETFs pulled in approximately $2.4 billion in net inflows for the week ending September 25, making it the strongest weekly haul since early October 2025. That capital didn’t just pad fund balances. It physically removed Bitcoin from the liquid supply pool. Who’s buying and how much BlackRock’s IBIT led the charge with roughly $1.2 billion in weekly inflows, maintaining its position as the dominant vehicle for institutional Bitcoin exposure. Fidelity’s FBTC followed at about $702 million, with ARK 21Shares’ ARKB contributing approximately $295 million. Since launching in January 2024, cumulative net inflows across all US spot Bitcoin ETFs have now surpassed $57 billion. Total assets under management sit at roughly $108 billion. Year-to-date ETF flows had actually turned negative earlier this year, bottoming out at approximately negative $5.8 billion in mid-July. The reversal since then has been sharp enough to push 2026 flows back into positive territory, now sitting at around $934 ...