Bitcoin Spot ETF Sees $924.5 Million Inflow…BlackRock Alone Exceeds Total

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While Bitcoin (BTC) spot ETFs recorded strong inflows in August, it appears that a single BlackRock product virtually propped up the entire market. With the weekly net inflow of the flagship product exceeding the total net inflow of all ETFs, an analysis suggests that attention should be paid to the risk of capital concentration rather than the recovery of institutional demand.

According to investment media TradingNews on September 1 (local time), US Bitcoin spot ETFs saw a net inflow of $216.7 million on August 31. BlackRock iShares Bitcoin Trust (IBIT) absorbed $205.9 million of this, accounting for 95% of the total net inflow. Grayscale Bitcoin Mini Trust received $9.4 million, Fidelity FBTC $6.9 million, and Bitwise BITB $4.3 million, while VanEck HODL saw an outflow of $13.4 million.

IBIT's dominance was even more evident in weekly statistics. For the week ending August 28, the total net inflow for all Bitcoin spot ETFs was $924.5 million, but IBIT alone received a larger amount of $938.3 million. Excluding BlackRock, the combined remaining products recorded a net outflow of $13.8 million. IBIT's cumulative net inflow also surpassed the total cumulative net inflow of all products, reaching $63.36 billion compared to $54.92 billion. This is due to continuous redemptions from other products, such as the Grayscale converted trust.

US Bitcoin spot ETFs saw a net inflow of $3.52 billion in August, marking the best monthly performance of 2026. Out of 21 trading days, only 5 recorded net outflows, and approximately $3.04 billion flowed in for 9 consecutive trading days until August 27. However, on August 28, a net outflow of $201.8 million, primarily from Ark 21Shares ARKB, halted the consecutive inflow streak. Considering that the cumulative net outflow from January to July amounted to $5.3 billion, despite the August rebound, the annual fund flow remains in a net outflow state of approximately $1.78 billion.

The total net assets of all ETFs are $99.61 billion, with holdings of approximately 1.23 million BTC, accounting for 6.77% of the mined supply. IBIT holds 746,478 BTC. However, the media pointed out that approximately 80% of the Bitcoin held by ETFs is concentrated in a single custodian, identifying this as a structural risk. Furthermore, out of 12 instances since the product launch in 2024 where monthly net inflows exceeded $3 billion, Bitcoin prices fell in the following month seven times, and the average return for those months was 0.13%, significantly below the overall monthly average of 2.93%.

The media presented a daily net inflow of $200 million as a key benchmark for the September ETF market. If daily net inflows consistently exceed this level, the fund recovery from August could continue. However, if it falls below $100 million or if net outflows occur for three consecutive trading days, the August rebound is more likely to be a temporary trend. Especially with the probability of a September interest rate hike, as reflected by the CME FedWatch, reaching 66.4%, and the US 10-year Treasury yield rising to 4.786%, the media placed the highest weight on a scenario where the pace of ETF inflows slows in September but does not turn into a full-scale net outflow.

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