BlackRock's iShares Bitcoin Trust pulled in $3.7 billion in net inflows this quarter, pushing its assets under management past $62 billion. The fund now accounts for more than the entire spot Bitcoin ETF category's cumulative net inflows since launch, as rivals continue bleeding assets.
BlackRock's iShares Bitcoin Trust (IBIT) pulled in $3.7 billion in net inflows this quarter, pushing its total assets under management to $62.6 billion. The fund's quarterly haul widens an already large gap between IBIT and every other spot Bitcoin ETF on the market.
The numbers behind the surge
IBIT's assets under management sat at roughly $43.4 billion at the end of June 2026, according to BlackRock's second-quarter 10-Q filing. That means the fund added approximately $19 billion in total value over a single quarter, combining fresh investor capital with Bitcoin's own price movement.
Cumulative net inflows into IBIT since its January 2024 launch now exceed $63.9 billion, a figure that surpasses 100% of total net inflows across the entire US spot Bitcoin ETF category. That is only possible because rival funds have collectively hemorrhaged assets through net redemptions.
August 2026 was especially strong: combined inflows across all US spot Bitcoin ETFs hit around $3.5 billion for the month, the best performance the category has seen since September 2025, with IBIT capturing the lion's share. On September 3, 2026, the fund registered a single-day inflow of $454 million, and its daily flows through late August and early September consistently landed in the $100 million to $500 million range.
Why IBIT keeps winning
IBIT charges a sponsor fee of 0.25%, which is not the lowest in the category, since several rivals undercut that rate at launch and some even waived fees entirely for introductory periods. Yet the fund now holds the largest market share of US spot Bitcoin ETF assets and dominates trading volume in the category. Thirty-day net inflows into IBIT through early September 2026 totaled $2.78 billion.
A reversal from earlier headwinds
The current streak marks a sharp turnaround. Earlier in 2026, IBIT experienced periods of net outflows as Bitcoin prices fluctuated and some investors took profits following the strong performance of 2024 and 2025. Still, the distinction between inflow-driven and price-driven growth matters: while Bitcoin's own price moves have contributed to IBIT's ballooning asset base, the $3.7 billion in quarterly net inflows represents genuine new capital entering the fund.
Sustained ETF inflows create consistent buying pressure for Bitcoin itself, since issuers must purchase the underlying asset to back new shares. With IBIT's cumulative inflows exceeding the total net inflows of the entire category, the math implies that other spot Bitcoin ETFs are collectively in net outflow territory since launch.
Source: Crypto Briefing
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