Spot Bitcoin ETFs (exchange traded funds) are one of the biggest stories and have been a game changer in the cryptocurrency space over the past two years. These investment products allow people to participate in the cryptocurrency market without having to directly own the digital assets.
Interestingly, one of the biggest winners – which is often overlooked – has been the issuers, especially as the crypto industry has seen greater institutional adoption since the launch of the Bitcoin ETFs. According to the company’s president, it was not envisioned that BTC exchange-traded funds would become the main source of revenue for BlackRock, the world’s largest asset manager.
BlackRock’s Bitcoin Funds Exceed Expectations
At the Blockchain Conference 2025 in São Paulo on Friday, November 28, Cristiano Castro, director of business development for BlackRock in Brazil, said: told reporters that the Bitcoin ETFs are the largest source of revenue for their company. According to the director, this development came as a “big surprise” for the asset manager.
Castro said in a statement:
We were very optimistic when we launched, but we didn’t believe it would reach such proportions. To give you an idea, it is [IBIT in the US and IBIT39 in Brazil – the asset’s reference names] came very close to $100 billion [in allocation].
This performance is notable for Bitcoin ETFs, especially considering that BlackRock offers more than 1,400 exchange-traded products worldwide and has a whopping $13.4 trillion in assets under management. The US-based Bitcoin fund (with the IBIT ticker) has over $70.7 billion in net assets, making it the first ETF to reach the $70 billion mark (by June 2025).
Although the US Bitcoin ETF market has slowed somewhat, BlackRock’s IBIT still continues to outperform other ETFs launched in recent years. As previous reports suggested, IBIT had managed to generate approximately $245 million in annual fees as of October 2025.
Bitcoin ETF Outflows ‘Completely Normal’ – Castro
When asked about the recent outflows from BlackRock’s Bitcoin ETF as the market leader’s value fell, the executive said there are no surprises in that trend. “ETFs are highly liquid and powerful instruments, and their purpose is to allow people to allocate their capital and manage their cash flow,” Castro said.
The BlackRock executive said the pullbacks are expected given that the product is largely owned by retail investors, who are reactionary in nature to price corrections. On Friday, the iShares Bitcoin Trust saw net outflows of $113.72 million, bringing the weekly record to negative $137.01 million and reaching the fund’s fifth straight week of withdrawals.
Featured image from Getty Images, chart from TradingView