Bitcoin News
BlackRock’s IBIT September inflows vs Fidelity’s FBTC
BlackRock’s IBIT captured $454 million in net inflows on September 3, 2026, which accounted for 62% of the $730.8 million total US spot Bitcoin ETF inflows that day. This single-day surge followed a $236 million withdrawal on September 1, when IBIT alone shed $201 million. I see these massive swings as a sign of how quickly institutional sentiment flips. While the sector pulled in $731 million on September 3, the total US Bitcoin ETF market reached $103.34 billion in net assets, which is about 6.32% of Bitcoin’s entire market capitalization. This activity follows a three-week run where US spot Bitcoin ETFs pulled in $3.8 billion in net inflows. The August rally saw US Bitcoin ETFs collect $1.92 billion across five trading sessions ending August 21, where Bitcoin funds accounted for 73% of that total. This momentum follows a difficult June that saw the spot ETF complex hemorrhage $3.4 billion in net outflows during a single week. I would call IBIT’s June performance a complete failure, as the fund saw $980 million in outflows during that record week. These inflows arrived as Bitcoin reclaimed the $80,000 level, even though the price sat near $79,675 on September 5. The massive inflow on September 3 was more than triple the size of any single day recorded during an 11-session run of positive flows that stretched through late August.
Competition between IBIT and FBTC
I find the competition between IBIT and FBTC reveals a clear choice between liquidity and custodial control. IBIT holds $59.75 billion in assets under management, whereas FBTC holds $13.41 billion. IBIT uses Coinbase for custody, but FBTC uses its own Fidelity Digital Assets business. This self-custody setup reduces counterparty risk for investors who want to avoid third-party providers. I find the expense ratios identical at 0.25% for both products.
| Metric | IBIT | FBTC |
|---|---|---|
| Issuer | BlackRock | Fidelity |
| Assets Under Management | $59.75 B | $13.41 B |
| Expense Ratio | 0.25% | 0.25% |
| Custodian | Coinbase | Fidelity Digital Assets |
| YTD Performance | -13.17% | -13.16% |
Do you want to trade high volumes or minimize your reliance on Coinbase? IBIT provides better liquidity for active traders due to its massive trading volume and deep order books. FBTC appeals to existing Fidelity customers who want to keep their investment activity in one place. Because IBIT accounts for such a massive portion of the daily flows, a single large withdrawal from this fund can easily distort how the entire market perceives the strength of institutional demand for Bitcoin. IBIT’s large asset base translates to tighter bid-ask spreads. I also note that IBIT holds 0.000566 BTC per share while FBTC holds 0.000870 BTC per share.
Performance and institutional demand
FBTC shows a slightly better YTD performance of -13.16% compared to -13.17% for IBIT. IBIT’s YTD flows total $2.06 billion, while FBTC shows -$1.83 billion in YTD flows. I would skip IBIT if you prioritize avoiding third-party custody risks. IBIT remains the dominant force in this space. Its scale makes it the de facto proxy for institutional sentiment. IBIT’s massive size means its movements often dictate the direction of the entire ETF category. I also recall that Jane Street reported holding over $828 million in IBIT as of June 30. I find that the discrepancy between the fund flows and the spot price suggests that institutions accumulate on weakness while shorter-term holders sell into the rally. This behavior follows a strong August when Bitcoin jumped 25% from its $63,500 levels. The gap between the fund demand and the price action suggests that long-term allocators are routing new capital in through the funds, while shorter-term spot holders and leveraged traders sell into that bid. Which fund will ultimately capture the next wave of institutional capital?
