U.S. spot Bitcoin ETFs have recorded $730.9 million in net inflows in their strongest single trading session since mid-January, led by more than $450 million entering BlackRock’s iShares Bitcoin Trust. Summary U.S. spot Bitcoin ETFs recorded $731 million in net inflows on Sept. 3, their strongest single trading day since January. BlackRock’s IBIT led the session with $454 million, followed by $138 million for ARKB and roughly $74 million for Fidelity’s FBTC. Combined Bitcoin ETF net assets reached $103.34 billion, equal to just over 6% of Bitcoin’s market capitalization. The inflows followed a $236 million withdrawal on Sept. 1, when IBIT alone recorded roughly $201 million in redemptions. According to SoSoValue data for Sept. 3, the group posted its largest daily inflow since Jan. 14, when the funds attracted $843.6 million, pushing cumulative net inflows since their January 2024 launch to $55.44 billion. Bitcoin ETF inflows reach $731 million BlackRock’s IBIT accounted for $454 million of Thursday’s inflows, representing more than 60% of the total. The latest allocation brought the fund’s cumulative net inflows to $63.94 billion. ARK Invest and 21Shares’ ARKB ranked second with $138 million, while Fidelity’s FBTC received roughly $74 million. Grayscale’s two Bitcoin products drew a combined $57 million during the session. VanEck’s HODL and WisdomTree’s BTCW were the only products to record withdrawals. HODL lost close to $20 million, while approximately $5 million left BTCW. The inflows arrived as Bitcoin rebounded sharply, with the U.S.-listed funds gaining between 5.7% and 5.9% during Thursday’s trading session. Their combined net assets climbed to $103.34 billion, equivalent to 6.32% of Bitcoin’s market capitalization. Thursday’s result was more than three times the size of any single daily inflow recorded during an 11-session run of positive flows in late August. The latest buying followed an active August for the products. U.S. Bitcoin ETFs collected $1.92 billion during the five trading sessions ending Aug. 21, when Bitcoin and Ether ETFs together attracted $2.61 billion in their strongest combined week since October 2025. Bitcoin funds accounted for roughly 73% of those flows, while spot Ether ETFs received $697.47 million during the same five-day period. BlackRock’s IBIT remains the main source of ETF demand IBIT has repeatedly accounted for a large share of the money entering U.S. spot Bitcoin ETFs during recent periods of buying. Crypto.news previously reported that the funds attracted $853.5 million over five days from Aug. 3 through Aug. 7. BlackRock’s fund brought in an estimated $693 million during the run, equivalent to roughly 81% of the group’s total inflows. The pattern continued later in August. QCP Capital said Bitcoin’s advance from approximately $63,500 to above $80,000 was supported by spot buying while futures positioning declined. During part of the rally, spot Bitcoin ETFs drew $2.8 billion across eight consecutive sessions. Futures open interest fell from 646,000 BTC to 588,000 BTC as Bitcoin advanced, according to QCP, separating the price move from rallies driven primarily by an increase in leveraged positions. IBIT has remained the largest U.S. spot Bitcoin ETF by assets through the changes in daily flows. BlackRock had reported $60.52 billion in net assets for the fund as of Aug. 26, before Bitcoin’s latest advance and Thursday’s increase in ETF asset values. Institutional filings have shown large positions in the fund as well. Jane Street reported more than $1 billion in U.S. spot Bitcoin ETF shares as of June 30, including approximately $828 million in IBIT. The quarterly filing represented positions at the end of June and did not disclose the trading firm’s current exposure. ETF flows have remained volatile between large buying sessions Large inflows have not produced a continuous run of buying across every trading day. The U.S. products recorded $201.9 million in net outflows on Aug. 28, ending nine consecutive sessions of inflows. ARK 21Shares’ ARKB led the withdrawals with $114.9 million, while IBIT lost $33.4 million. Despite the final negative session, the funds still attracted a combined $924.5 million during the Aug. 24 to Aug. 28 trading week. Flows reversed again as September began. Investors withdrew $236 million from the funds on Sept. 1, with IBIT accounting for roughly $201 million of the redemptions. SoSoValue data showed the group returned to net buying the following session, taking in approximately $101 million on Sept. 2. IBIT received roughly $115 million, offsetting withdrawals elsewhere in the group before Thursday’s much larger allocation. The $454 million that entered IBIT on Sept. 3 therefore came two sessions after the fund recorded a $201 million withdrawal, putting BlackRock’s product on both sides of the largest daily moves during the opening days of September. The recent swings follow a period when Bitcoin ETF demand had already recovered from sustained withdrawals earlier in the year. The products entered July after eight consecutive negative weeks, including $527 million in withdrawals during the four trading days ending July 2. A $221.7 million inflow on July 2 ended a 10-day daily withdrawal run, while BlackRock returned to larger allocations days later. IBIT received $209.4 million on July 7 as total daily inflows across the U.S. Bitcoin ETFs reached $265.7 million. By July 30, another $233.1 million entered the products, with BlackRock taking $183.4 million. The fund accounted for 78.7% of that session’s inflows. Thursday’s $730.9 million allocation has now exceeded each of those daily totals, while the combined net asset value of the U.S. spot Bitcoin ETF market has moved above $103 billion.
