BlackRock IBIT Takes In $665M, Lifting Total Bitcoin ETF Inflows to $527M

A single fund's dominance on October 20 illustrates how concentrated demand for spot Bitcoin ETFs has become among US institutional products, with two competing funds simultaneously recording net...

BlackRock's iShares Bitcoin Trust (IBIT) recorded $665.2 million in net inflows on October 20, 2026, according to CoinTelegraph, making it the largest single-day inflow for US spot Bitcoin exchange-traded funds since September. The figure is notable because IBIT's intake exceeded the combined total for the entire Bitcoin ETF category, which posted net inflows of $527 million for the day.

The discrepancy between IBIT's individual inflow and the category total is explained by simultaneous outflows at two competing funds. Fidelity's FBTC saw withdrawals of $83.6 million, and Grayscale's GBTC saw withdrawals of $54.9 million on the same day, according to CoinDesk. All other spot Bitcoin ETFs in the US market recorded no net flows in either direction, per the same CoinDesk report.

The $527 million category total represents the largest combined daily inflow for US spot Bitcoin ETFs since September 2026, according to CoinTelegraph. The specific September date and that month's peak figure were not disclosed in the source material, so a precise month-over-month comparison is not possible from available data.

Separately, BlackRock filed with the US Securities and Exchange Commission for a third Bitcoin-linked ETF, according to CoinTelegraph. The proposed fund, named the iShares Bitcoin Managed Protection ETF with the proposed ticker PBIT, would use options contracts to limit both potential losses and potential gains, a structure commonly called a buffer or defined-outcome strategy in the ETF industry.

The options-based structure differentiates PBIT from BlackRock's existing IBIT, which provides direct spot exposure to Bitcoin, and from its iShares Ethereum Trust, which provides direct spot exposure to Ether. A defined-outcome Bitcoin ETF would be designed to appeal to investors who want partial exposure to Bitcoin price movements while capping downside risk, a profile more consistent with institutional risk-management mandates than pure spot ownership.

BlackRock's SEC filing for PBIT does not include exposure to Solana or XRP, according to CoinTelegraph. Neither the filing nor the source reporting explains whether BlackRock has or has not submitted separate applications for ETFs tied to those assets. What would clarify the company's broader digital asset product roadmap is a public SEC filing or official company statement on those specific tokens.

Grayscale's GBTC has recorded persistent outflows since its January 2024 conversion from a closed-end trust to a spot ETF, a structural shift that allowed shareholders to redeem at net asset value for the first time. The October 20 outflow of $54.9 million, cited by CoinDesk, continues a pattern that has characterized GBTC since that conversion, though the cumulative total of outflows since conversion was not provided in the available source material.

Fidelity's FBTC launched alongside IBIT in January 2024 following SEC approval of spot Bitcoin ETFs in the United States. The fund has at various points recorded strong inflows, but its $83.6 million outflow on October 20, per CoinDesk, placed it on the losing side of the day's category-wide net total.

The concentration of inflows within a single fund raises a structural question for the US spot Bitcoin ETF market: whether IBIT's scale advantages, including liquidity, brand recognition, and institutional distribution, are compounding over time in ways that make it increasingly difficult for competing products to capture new flows. That question cannot be answered from a single day's data and would require a multi-month flow analysis across all funds, which is not included in the available source material.

BlackRock manages approximately $10 trillion in assets under management globally, according to its most recent public filings. The firm did not issue a press release on October 20 specifically addressing IBIT's daily inflow figure or the PBIT filing timeline, and SEC review periods for new ETF applications vary and are not predetermined.