Spot Bitcoin exchange-traded funds (ETFs) in the United States have attracted approximately $3.8 billion in net inflows during March 2026, establishing a new monthly record. The milestone reflects the continued maturation of Bitcoin as an institutional asset class, nearly two years after the initial wave of spot ETF approvals in January 2024.
Leading the Pack
The top-performing funds by net inflows in March 2026 are:
- BlackRock iShares Bitcoin Trust (IBIT): $1.6 billion in net inflows, maintaining its position as the dominant spot Bitcoin ETF.
- Fidelity Wise Origin Bitcoin Fund (FBTC): $890 million in net inflows.
- ARK 21Shares Bitcoin ETF (ARKB): $520 million in net inflows.
Institutional Trends
13F filings from Q4 2025 revealed that over 700 institutional investors now hold positions in spot Bitcoin ETFs, including hedge funds, pension funds, university endowments, and sovereign wealth funds. The breadth of institutional adoption suggests that Bitcoin ETFs have become a standard component of institutional portfolio construction.
Impact on Bitcoin Supply
The sustained inflows have significant supply implications. Spot Bitcoin ETFs now collectively hold over 1.2 million BTC — approximately 5.7% of the total Bitcoin supply. With daily ETF demand regularly exceeding daily miner production, the supply-demand dynamics remain constructive for long-term price appreciation.
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Comments
These inflow numbers are remarkable. $8.4 billion in a single quarter proves that institutional demand for bitcoin is structural, not speculative. This changes the game completely.
BlackRock IBIT alone holding over $30B in AUM is extraordinary for a product that launched just over two years ago. ETFs have been the single most important catalyst for BTC price.
The Ethereum ETF underperformance is interesting. Is it a product awareness issue or genuine preference for BTC as a store of value? I think it reflects institutional comfort levels.