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BlackRock’s Bitcoin ETF Ranks Fifth in US ETF Trading Volume; IBIT Jumps 6% - bloomingbit

Reported by Bloomingbit
Sep 18, 2026· 2 min read
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Key Takeaways
  • • BlackRock's iShares Bitcoin Trust ETF (IBIT) ranks fifth in overall US ETF trading volume and controls approximately 75% of the total spot Bitcoin ETF category, demonstrating dominant market positioning within the digital asset fund space.
  • • IBIT surged 6% in the referenced period while recording $59.09 billion in assets under management, representing near-$100 billion potential following recent inflows and Bitcoin price appreciation.
  • • The fund captured between 54–83% of daily net inflows across six consecutive trading sessions (August 17–24), with inflows totaling $1.54 billion during that positive run after experiencing outflows earlier in the month.
  • • IBIT's 0.25% expense ratio and rapid asset accumulation—reaching $1 billion in assets within five days of launch—position it as one of BlackRock's most profitable ETF offerings, with retail participation notably strong among new cryptocurrency investors.
  • • Total US spot Bitcoin ETF category assets reached $79.16 billion as of August 24, with cumulative net inflows of $54.50 billion (681,290 BTC), signaling sustained institutional and retail demand for regulated Bitcoin exposure.
Summary
BlackRock's iShares Bitcoin Trust ETF (IBIT) has achieved substantial market penetration in the competitive spot Bitcoin ETF landscape, commanding approximately 75% of category assets and ranking fifth overall among all US ETF trading volumes. This dominance reflects the fund's rapid growth trajectory and the broader institutional adoption of regulated Bitcoin exposure following IBIT's launch.

The fund's asset base has expanded to $59.09 billion as of late August, with momentum accelerating in recent sessions. Between August 17 and August 24, IBIT captured between 54% and 83% of daily net inflows across the entire spot Bitcoin ETF category, pulling in $1.54 billion collectively during six consecutive positive trading days. The strongest single day occurred on August 20, when IBIT recorded $503 million in net inflows against total category inflows of $606.3 million. This performance follows an earlier August downturn when IBIT experienced modest outflows, underscoring the volatility inherent in the nascent spot Bitcoin ETF market.

IBIT's operational metrics underscore its efficiency and appeal to institutional clients. The fund maintains a competitive 0.25% expense ratio and has demonstrated rapid scaling capabilities, accumulating more than $1 billion in assets within its first five trading days. As of August 24, IBIT traded at $44.735 per share with 1.33 billion shares outstanding, reflecting substantial equity interest. The broader spot Bitcoin ETF category has accumulated $54.50 billion in net inflows representing approximately 681,290 BTC, with total category assets reaching $79.16 billion.

The fund's growth reflects both Bitcoin price appreciation and significant inflows from new entrants to cryptocurrency markets. Data indicates that approximately 75% of IBIT buyers represent individuals new to digital assets, suggesting the product has successfully democratized Bitcoin access for retail and institutional investors seeking regulated exposure without direct custody responsibilities. This positioning has made IBIT one of BlackRock's most profitable ETF vehicles, approaching $100 billion in potential assets under management.

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Sources

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Bloomingbit BlackRock’s Bitcoin ETF Ranks Fifth in US ETF Trading Volume; IBIT Jumps 6% - bloomingbit