SKN | BlackRock’s IBIT Pulled In $196 Million in One Day. Is Institutional Bitcoin Demand Shifting?

Key Points:

• BlackRock’s IBIT attracted $196 million on October 1, helping bring its four-day inflows to $292 million, while Fidelity’s FBTC recorded approximately $197 million in outflows.
• IBIT held approximately $67.6 billion in net assets as of October 2, giving it substantial scale and liquidity advantages in the U.S. spot Bitcoin ETF market.
• The divergence may reflect quarter-end portfolio rebalancing after Bitcoin gained 36% in the third quarter rather than a permanent migration from Fidelity to BlackRock.

BlackRock’s iShares Bitcoin Trust (IBIT) and Fidelity’s Wise Origin Bitcoin Fund (FBTC) are showing sharply different fund-flow patterns even though both products provide exposure to the same underlying asset and charge an identical 0.25% annual sponsor fee. IBIT attracted $196 million on October 1, while FBTC lost $61 million, highlighting how institutional capital can increasingly differentiate between otherwise similar Bitcoin investment vehicles.

IBIT Captures the Strongest Recent Inflows

Between September 28 and October 1, IBIT received approximately $292 million in net inflows. The fund attracted $55 million on September 28 and another $51 million on September 29 before recording only a $10 million outflow on September 30. It then posted the week’s largest single-day inflow among U.S. spot Bitcoin ETFs with $196 million on October 1.

The broader ETF market was considerably less decisive. Across 12 U.S. spot Bitcoin funds, combined flows over those four sessions amounted to approximately $51 million. That means IBIT’s gains were not simply the result of a broad wave of new capital entering every Bitcoin ETF; some of the activity appears to have reflected differences in where investors chose to allocate existing exposure.

Scale Is Becoming a Competitive Advantage

IBIT’s size helps explain why institutions may favor it for large transactions. BlackRock reported $67.59 billion in net assets as of October 2, while its 30-day median bid-ask spread was just 0.02%. The fund also averaged approximately 47.9 million shares in daily trading volume over 30 days.

For institutional investors, scale can translate into deeper liquidity and more efficient execution, particularly when transactions are large. This creates a potential network effect: higher assets and trading activity can reinforce liquidity, which can in turn make the vehicle more attractive for additional institutional allocations.

However, the products remain economically similar. Both funds track Bitcoin exposure rather than operating fundamentally different investment strategies, and the source report notes that both charge 0.25%. The flow divergence therefore cannot simply be attributed to a lower fee at BlackRock.

Fidelity’s Outflows May Be About Timing

FBTC’s approximately $197 million of four-day outflows occurred immediately after the end of a strong quarter for Bitcoin. The cryptocurrency gained roughly 36% during Q3, according to the source report, giving institutional portfolios a natural reason to rebalance positions or realize gains at quarter-end.

The September 30 session illustrates the point. FBTC alone accounted for approximately $126 million of the $149 million withdrawn across all U.S. spot Bitcoin funds that day. Yet IBIT lost only about $10 million, suggesting that fund-specific positioning played a role in the divergence.

October Flows Will Reveal Whether the Pattern Persists

The most important question is whether the IBIT-FBTC divergence continues after quarter-end adjustments have passed. If IBIT continues attracting capital while FBTC experiences persistent redemptions, the data could indicate that liquidity and institutional preference are becoming increasingly concentrated in the largest Bitcoin ETF.

But if FBTC flows stabilize in October, the recent divergence would look more like temporary portfolio rebalancing than a structural shift. For crypto investors, the broader signal is that Bitcoin ETF competition is increasingly being shaped not only by fees, but also by scale, liquidity, execution quality and institutional market access—factors that could become more important as digital assets become further integrated into traditional portfolios.