Bitcoin ETFs See Strong Inflows as Ethereum Funds Post Daily Outflows

• Bitcoin ETFs added 2,544 BTC daily and 21,777 BTC weekly, showing steady inflows.
• Ethereum ETFs lost 11,463 ETH daily but gained 218,259 ETH weekly, signaling volatility.
• BlackRock leads Bitcoin ETF holdings with 763,699 BTC worth $88.74 billion.

Bitcoin ETFs recorded fresh inflows on September 17, 2025, showing sustained institutional participation in the largest cryptocurrency. According to data from Lookonchain, the group of ten funds registered a net addition of 2,544 BTC, valued at $295.6 million, while total holdings rose to 1,316,564 BTC.

At the same time, Ethereum ETFs experienced single-day outflows of 11,463 ETH, though their weekly performance reflected strong net inflows. Together, the figures underscored the growing scale of activity in crypto-linked exchange-traded products.

Bitcoin ETFs continued their momentum, with cumulative inflows of 21,777 BTC over the past week. The iShares Bitcoin Trust (IBIT) led all issuers, recording 1,794 BTC in daily inflows and 11,398 BTC across seven days. Fidelity’s Wise Origin Bitcoin Fund (FBTC) added 526 BTC in a single day and 6,978 BTC for the week. ARK 21Shares Bitcoin ETF (ARKB) secured 356 BTC, while Franklin Bitcoin ETF (EZBC) posted 125 BTC in new inflows.

Some funds moved in the opposite direction. The Bitwise Bitcoin ETF (BITB) registered a 492 BTC daily outflow, the sharpest decline in the group. Despite this, overall demand remained positive. BlackRock’s Bitcoin holdings reached 763,699 BTC, worth $88.74 billion, cementing its position as the largest single holder among issuers.

Ethereum ETFs Show Short-Term Weakness

Ethereum ETFs delivered a different performance profile, showing daily weakness but seven-day growth. On September 17, funds collectively lost 11,463 ETH, worth $51.6 million, yet added 218,259 ETH over the past week. Total Ethereum ETF holdings climbed to 6,597,677 ETH.

Source: Lookonchain

The iShares Ethereum Trust (ETHA) reported the largest daily reduction at 4,538 ETH but maintained a weekly net gain of 125,826 ETH. Fidelity’s Ethereum Fund (FETH) logged inflows of 11,277 ETH in a single day, with a weekly increase of 53,096 ETH. Grayscale’s Ethereum Trust (ETHE) followed with 2,151 ETH in daily inflows and 142,160 ETH over the past week.

Notably, Fidelity also reported the steepest daily outflow across the sector at 10,731 ETH, valued at $48.29 million. Its Ethereum fund currently holds 788,934 ETH, with assets valued at $3.55 billion.

Institutional Flows Indicate Diverging Patterns

The recent activity highlighted diverging institutional strategies across the two assets. Bitcoin ETFs extended consistent daily gains, supported by strong weekly inflows across multiple issuers. Ethereum ETFs, by contrast, showed volatility on shorter timeframes but posted record inflows over the week.

Overall, the flows displayed the central role of ETFs in providing institutional access to digital assets. While Bitcoin ETFs maintain steady growth, Ethereum funds are undergoing shifting patterns, balancing daily outflows with robust longer-term allocations.