U.S. spot Bitcoin funds drew $3.236 billion in their second-biggest week

Data available on October 4, 2025 showed that U.S. spot Bitcoin exchange-traded products had completed their second-largest weekly inflow since trading began in January 2024. Farside Investors’ daily table recorded $3.236 billion of aggregate net inflows across the five U.S. trading sessions from September 29 through October 3.

The result mattered because it measured demand through regulated securities products at a moment when Bitcoin was approaching its August 2025 price record. A contemporaneous report from The Block, using SoSoValue data, rounded the weekly inflow to $3.24 billion and ranked it behind only the $3.38 billion recorded for the week ending November 22, 2024.

Five positive sessions produced the total

Farside reported aggregate daily inflows of $518.0 million on September 29, $429.9 million on September 30, $675.8 million on October 1, $627.2 million on October 2 and $985.1 million on October 3. Adding those displayed figures produces Coinburn’s $3.236 billion calculation.

BlackRock’s iShares Bitcoin Trust, identified as IBIT in the table, contributed approximately $1.816 billion during the five-session window. Fidelity’s Wise Origin Bitcoin Fund, or FBTC, contributed approximately $691.9 million. Together, the two products represented about 77.5% of the weekly total. These are Coinburn calculations from Farside’s rounded product-level observations, not figures independently reported by the issuers.

The inflows also represented a sharp reversal. Farside’s displayed daily totals for September 22 through September 26 sum to approximately $898.6 million of net outflows. Comparing that result with the following week produces a positive swing of roughly $4.135 billion. The Block, relying on SoSoValue, reported the swing as $4.14 billion; the small difference is consistent with rounding or provider methodology.

Bitcoin held near its previous record

OpenBitcoin’s historical series, which defines daily candles using UTC boundaries, records an October 4 opening price of $122,329, a high of $122,885, a low of $121,575 and a close of $122,441. The resulting daily change was approximately 0.1%.

Those figures describe an aggregated UTC series, not an official consolidated close. Bitcoin trades continuously across venues, and prices depend on the exchange, currency pair, aggregation method and timestamp. The defensible conclusion is therefore that Bitcoin remained above $122,000 during the October 4 UTC window—not that every holder could transact at the displayed close.

The timing supports an interpretation that ETF demand and stronger Bitcoin prices were part of the same market episode. It does not establish that the reported fund inflows caused the price move. Fund creations can involve authorized participants, cash, Bitcoin transfers, hedges and inventory adjustments that are not visible in a net-flow table.

Why the institutional channel mattered

The Securities and Exchange Commission’s January 10, 2024 order had approved exchange rule changes permitting 11 Bitcoin-based commodity trust products to list and trade. By October 4, 2025, the resulting products provided a measurable securities-market channel for Bitcoin exposure without requiring shareholders to custody Bitcoin directly.

Net inflows indicate that estimated creations exceeded redemptions. They are not trading volume, assets under management, purchases by one identifiable investor class or proof that an equivalent amount of Bitcoin was bought immediately in the open market.

Later confirmation

On October 6, 2025, CoinShares reported a broader record of $5.95 billion flowing into global digital-asset investment products during the preceding week, including $3.55 billion attributed to Bitcoin products. That later report used a wider international product universe than Farside’s U.S. spot-product table, so the two totals should not be treated as interchangeable.