BlackRock Expands Bitcoin ETF Holdings as Institutional Interest Grows
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BlackRock, one of the world’s biggest asset managers, is showing stronger interest in Bitcoin through its exchange-traded fund (ETF). Its Strategic Income Opportunities Portfolio has quietly increased its shares in the iShares Bitcoin Trust (IBIT).
By March 31, 2025, the portfolio held over 2.1 million IBIT shares worth around $99.4 million—up from 1.6 million at the end of 2024. IBIT, approved in January 2024 along with 10 other spot Bitcoin ETFs, is now the largest of its kind, holding more than $72 billion in assets. This growth shows that BlackRock is looking beyond traditional bonds and is now including digital assets to improve returns and protect investments.
Rising ETFs Holdings Reflect Growing Institutional Confidence
The Strategic Income Opportunities Portfolio mainly focuses on bonds but also includes investments in other markets to increase returns. However, adding Bitcoin ETF is part of this broader strategy.

With more than 2 million IBIT shares now held, BlackRock’s move shows confidence in Bitcoin’s long-term value. Also, the company’s increased holdings reflect its effort to meet investor interest in digital assets. This shift marks a new phase for big financial firms, as they now take Bitcoin more seriously and include it in traditional investment plans.
Bitcoin ETF Demand Surges Among Big Investors
The first year of US spot Bitcoin ETFs was highly successful, and 2025 is continuing that trend. However, in just two days in May, Bitcoin ETFs received over $1.5 billion in net inflows. It is important to note that much of this growth came from BlackRock’s IBIT, which has seen steady daily investments, sometimes above $500 million.
To this end, these inflows show that many institutions are buying into Bitcoin ETFs to satisfy growing client demand. Bitwise, another asset manager, believes that Bitcoin ETF investments could reach $120 billion this year and might even hit $300 billion by 2026. However, large platforms for wealth managers remain largely untouched, offering even more room for future growth.
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