BlackRock's iShares Bitcoin Trust pulled in $117.4 million in a single session on September 4, 2026, as clients kept funneling capital into the world's largest spot Bitcoin ETF. Combined with the previous day's inflow, the two-day total topped half a billion dollars, while IBIT's cumulative inflows since launch now exceed $60 billion.
BlackRock's iShares Bitcoin Trust (IBIT) took in $117.4 million in a single trading session on September 4, 2026, as clients continued to channel capital into the fund. A day earlier, IBIT alone had absorbed $454 million, pushing the two-day combined figure well above half a billion dollars.
The September 4 haul pushed total U.S. spot Bitcoin ETF inflows to $174.6 million that day. Fidelity's FBTC contributed the remaining $57.2 million. IBIT has led net inflows across the U.S. spot Bitcoin ETF landscape throughout 2026, and FBTC has been its closest competitor, though the gap has remained wide.
BlackRock is not buying Bitcoin for itself. The firm has been explicit that it only transacts in Bitcoin when clients instruct it to through the fund, acting as an intermediary rather than a principal investor. Inflows and outflows correspond directly to creations and redemptions in the ETF structure, so every net inflow day represents actual Bitcoin bought on behalf of clients in the open market, handled in partnership with custodians like Coinbase Prime.
Cumulative net inflows into IBIT have now exceeded $60 billion since the fund launched in January 2024, cementing its position as the dominant vehicle in the U.S. spot Bitcoin ETF category by a considerable margin. Days with inflows the size of September 3's $454 million were notable events in 2024 and early 2025. By mid-2026, though, they have become a recurring feature of the market rather than a headline anomaly.
Source: Crypto Briefing
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