Roughly 35,800 BTC left exchange wallets last week as U.S. spot Bitcoin ETFs attracted approximately $2.4 billion in net inflows for the week ending September 25. It was the strongest weekly intake since early October 2025, with BlackRock’s IBIT leading at roughly $1.2 billion, followed by Fidelity’s FBTC at about $702 million and ARK 21Shares’ ARKB at approximately $295 million. Since launching in January 2024, the ETFs have accumulated more than $57 billion in net inflows and roughly $108 billion in assets under management. Year-to-date flows, which had fallen to approximately negative $5.8 billion in mid-July, have since recovered to around $934 million. Centralized exchanges recorded net outflows of about 31,782 BTC, worth roughly $2.52 billion at current prices, including nearly 19,500 BTC withdrawn from Binance. The movement suggests more Bitcoin is shifting into ETFs and long-term storage, reducing the supply readily available for trading. Bitcoin’s capped supply of 21 million coins, of which roughly 19.7 million have been mined, reinforces the potential impact of sustained withdrawals. IBIT’s share of weekly inflows also indicates that BlackRock may be becoming the default institutional allocation vehicle as the market matures.