HedgeCo.Net — U.S. spot Bitcoin ETFs recorded about $433.0 million of net inflows on September 18, 2026, according to Farside Investors’ daily table, with Fidelity’s FBTC leading at $310.7 million and BlackRock’s IBIT adding $108.4 million. That session follows HedgeCo’s prior note on September 17’s roughly $160 million of Bitcoin ETF inflows and contrasts with mid-week outflow prints earlier in the same week.
Secondary aggregators diverged: some outlets citing incomplete issuer tallies printed roughly $325 million for the same day, while other wires repeated a $433 million total aligned with Farside. Prefer the Farside primary. Spot Ether ETFs, also per Farside, booked about $143.7 million of net inflows on September 18, including $114.3 million into ETHA and $26.2 million into Fidelity’s FETH, after multi-day outflow stretches earlier in the week.
Mark Farside’s $433.0 million Bitcoin total, the FBTC / IBIT split, and the $143.7 million Ether total as the authoritative session print. Note the ~$325 million conflicting secondary figure without elevating it over Farside.