BlackRock’s spot Bitcoin exchange-traded funds (ETFs) have become the asset manager’s largest revenue source, according to a senior company executive, underscoring the scale and pace of institutional demand for bitcoin exposure via regulated fund structures.
BlackRock says Bitcoin ETFs now its top revenue driver
Speaking at the Blockchain Conference 2025 in São Paulo on Friday, November 28, Cristiano Castro, BlackRock’s director of business development in Brazil, said the firm’s Bitcoin ETFs now generate more revenue than any other product line. The shift is notable given BlackRock’s breadth—more than 1,400 ETFs globally—and its position as the world’s largest asset manager, with over $13.4 trillion in assets under management.
Castro said the Bitcoin ETFs have surpassed legacy products that have been producing revenue for over two decades. Industry-wide, assets in U.S.-listed spot Bitcoin ETFs have grown rapidly, with allocations approaching $100 billion, according to market estimates.
IBIT’s rapid ascent
BlackRock’s flagship iShares Bitcoin Trust (IBIT) has been cited by industry trackers as one of the fastest-growing ETFs on record, even amid recent price volatility. The fund has led category trading activity and, by some estimates, now holds more than 3% of bitcoin’s circulating supply.
Heavy trading meets shifting flows
U.S.-listed spot Bitcoin ETFs recorded roughly $40 billion in trading volume last week, with IBIT leading activity, according to industry data. Despite the elevated turnover, flows have been volatile:
- IBIT posted approximately $2.2 billion in net outflows month-to-date as of Monday, according to FactSet.
- Across the broader U.S. spot Bitcoin ETF cohort, investors withdrew about $3.5 billion so far in November, nearing the previous monthly outflow record of $3.6 billion set in February, Bloomberg data show.
Why it matters
The revenue milestone highlights how rapidly crypto-linked ETFs have scaled within mainstream portfolios and fee pools. While net flows can swing with market conditions, the combination of sizable assets, sustained trading volumes, and management fees has made Bitcoin ETFs a meaningful line of business for BlackRock.