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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 underscores a widening gap between IBIT and every other spot Bitcoin ETF on the market. While BlackRock’s product hoovers up billions, many of its competitors have been watching capital walk out the door.
The numbers behind the surge
IBIT’s AUM 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 the span of a single quarter, a combination of fresh investor capital and Bitcoin price movement.
Cumulative net inflows into IBIT since its January 2024 launch now exceed $63.9 billion. That figure actually surpasses 100% of total net inflows across the entire US spot Bitcoin ETF category, a mathematical quirk that’s only possible because rival funds have 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, marking the best performance the category has seen since September 2025. IBIT captured the lion’s share of that activity.
Daily flow data tells the same story. On September 3, 2026, IBIT registered a single-day inflow of $454 million. Through late August and early September, the fund’s daily flows consistently landed in the $100 million to $500 million range.
Why IBIT keeps winning
The spot Bitcoin ETF race launched in January 2024 with nearly a dozen competitors hitting the market simultaneously. IBIT charges a sponsor fee of 0.25%, which isn’t the lowest in the category. Several rivals undercut that rate significantly at launch, some even waiving fees entirely for introductory periods.
IBIT 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 inflow streak is notable partly because it represents 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.
The distinction between inflow-driven and price-driven AUM growth matters here. While Bitcoin’s own price movements have contributed to IBIT’s ballooning asset base, the $3.7 billion in quarterly net inflows represents genuine new capital entering the fund.
What this means for the Bitcoin market
IBIT’s dominance is reshaping how capital flows into Bitcoin. The fund has effectively become the primary gateway for institutional Bitcoin exposure in the US.
On the benefit side, sustained ETF inflows create consistent buying pressure for Bitcoin itself. ETF issuers must purchase the underlying asset to back new shares, meaning that $3.7 billion in quarterly inflows translates to billions of dollars in Bitcoin demand that wouldn’t otherwise exist in the spot market. This structural demand floor didn’t exist before January 2024.
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.
Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.
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