HedgeCo.Net — U.S. spot bitcoin ETFs recorded a combined net inflow of $731 million on September 3, 2026 (Eastern), according to SoSoValue data carried by Odaily on September 4. Blockonomi independently printed the same $731 million session total and the same BlackRock IBIT lead of $454 million, citing Wu Blockchain’s September 4 tape.
IBIT’s single-day lead was followed by Ark Invest / 21Shares’ ARKB at $138 million net inflow. VanEck’s HODL posted the largest single-day net outflow among the complex at about $19.6 million. Odaily’s SoSoValue wrap put aggregate spot-bitcoin ETF net assets at about $103.3 billion and cumulative net inflows at about $55.4 billion as of the print. Ethereum spot ETFs were reported in the same Blockonomi/Wu tape with about $141 million of net inflows on the day.
This is a one-day flow print, not a structural cycle call. Mark $731 million net, IBIT +$454 million, ARKB +$138 million, and HODL ? ?$19.6 million as the session figures; treat ~$103.3 billion AUM and ~$55.4 billion cumulative inflows as SoSoValue’s accompanying stock figures. Do not invent a “strongest since January” ranking unless both sources state it in the same terms, and do not fold ether ETF flows into the bitcoin headline. The allocator object is the U.S. spot bitcoin ETF complex posting a large IBIT-led inflow session one day after HedgeCo.Net’s September 2 +$101.15 million print.