United States spot Bitcoin ETFs took in roughly $2.65 billion in net inflows during September, their second-strongest month since November 2025, according to figures first published by COINOTAG on October 2. BlackRock's IBIT led the month's flows.

Only August, which drew approximately $3.54 billion, attracted more capital over the eleven months since November 2025 set the benchmark that both autumn months are now measured against. September's figure trailed August's by roughly $890 million, leaving August and September as the two strongest months in that span.

IBIT, the iShares Bitcoin Trust, is BlackRock's spot Bitcoin ETF offering. BlackRock is the world's largest asset manager, and IBIT stands as the largest fund in the US spot Bitcoin ETF category by assets under management. Its lead in September's flows means the category's largest fund also captured the most new capital during the month. Spot Bitcoin ETFs began trading in the United States in January 2024, when the U.S. Securities and Exchange Commission approved the first wave of such products, giving investors a way to gain exposure to Bitcoin through conventional brokerage accounts without directly holding the cryptocurrency.

Net inflows, meaning the balance of fund creations versus redemptions over a given period, are widely tracked as a gauge of demand for the ETF structure, which has drawn participation from both retail and institutional investors since its debut. Month-by-month readings like September's offer a running picture of that demand, and the figures covering October will be the next entry in the comparison against the November 2025 benchmark.

This content was first published on COINOTAG: https://en.coinotag.com/bitcoin-btc-etf-september-inflows-ibit-2-65b