U.S.-listed spot Bitcoin and Ether ETFs have attracted $2.61 billion across five trading sessions, recording their strongest combined week since October 2025.
Summary
- Spot Bitcoin ETFs received $1.92 billion, accounting for 73% of the combined inflows.
- Ether ETFs attracted $697.47 million after posting gains during all five sessions.
- Combined flows improved by $3.01 billion from the previous week’s $391.96 million outflow.
- BlackRock’s IBIT and ETHA led their respective categories on Aug. 21.
Bitcoin ETF inflows reach $1.92 billion
SoSoValue data showed that U.S. spot Bitcoin ETFs recorded $307 million in net inflows on Aug. 21, extending their run of positive daily flows to five trading sessions.
BlackRock’s iShares Bitcoin Trust, or IBIT, received $239 million during the final session, accounting for nearly 78% of the daily total. Fidelity’s Wise Origin Bitcoin Fund, or FBTC, ranked second with $30.19 million.
Following Friday’s allocations, IBIT’s cumulative net inflows reached $62.43 billion, while FBTC’s total rose to $10.18 billion. All U.S. spot Bitcoin ETFs held $96.07 billion in net assets, equal to 6.17% of Bitcoin’s market value, according to the data provider.
Friday’s result completed a week in which inflows accelerated as Bitcoin’s price climbed. The funds received $297.56 million on Aug. 17, followed by $189.30 million on Aug. 18 and $517.19 million on Aug. 19. Another $606.29 million entered the products on Aug. 20 before the pace eased to $307 million.
Adding the five sessions produces approximately $1.917 billion in net inflows. Bitcoin funds accounted for about 73% of the $2.615 billion that entered the two leading U.S. crypto ETF categories during the week.
One week earlier, investors had withdrawn $389.7 million from Bitcoin ETFs between Aug. 10 and Aug. 14. The latest result therefore represents a $2.31 billion improvement from one five-day period to the next, rather than a conventional percentage increase because the earlier figure was negative.
During the opening week of August, crypto.news reported a five-day streak that brought $853.5 million into Bitcoin ETFs. BlackRock contributed about $693 million, or 81% of that total, while Ether funds attracted another $244.9 million.
Compared with that period, the latest Bitcoin total was more than twice as large. SoSoValue’s historical weekly series also places the $1.92 billion intake above the $1.42 billion recorded in January, which had been the largest weekly Bitcoin ETF inflow since October 2025.
During the week of Oct. 6 to Oct. 10, 2025, the funds attracted about $2.71 billion. SoSoValue data showed that an even larger $3.24 billion entered Bitcoin ETFs between Sept. 29 and Oct. 3.
Ether ETFs add nearly $700 million
SoSoValue’s Ether ETF tracker showed that the products received $185 million on Aug. 21, completing their own five-session inflow run.
BlackRock’s iShares Ethereum Trust ETF, or ETHA, led Friday with $151 million. Grayscale’s Ethereum Mini Trust ETF followed with $11.51 million, lifting its cumulative net inflows to $1.85 billion.
ETHA has now attracted $12.17 billion since its launch. Across the full category, spot Ether ETFs held $14.30 billion in net assets at the end of the session, representing 4.85% of Ethereum’s market value. Historical cumulative net inflows stood at $12.15 billion.
Daily allocations began at $30.85 million on Aug. 17 before rising to $71.47 million on Aug. 18. The products then added $189.15 million on Aug. 19 and $221 million on Aug. 20, followed by Friday’s $185 million.
Together, the five sessions delivered approximately $697.47 million. The total followed a $2.26 million net outflow during the week ending Aug. 14, producing a $699.73 million improvement.
Ether’s latest intake also exceeded the category’s full July result. As previously covered in August, spot Ether ETFs attracted $365 million in July, compared with $205 million for Bitcoin funds. Ether products received more monthly capital than their Bitcoin counterparts for the first time since both categories began trading.
The order changed during the latest week, with Bitcoin again taking most of the new money. Ether still captured about 27% of combined inflows, while both asset groups recorded positive flows during every session.
ETF demand accompanied the Bitcoin and Ether rally
Bitcoin’s ETF intake rose as the asset broke out of a six-week trading range. On Aug. 21, Bitcoin cleared $76,000 after gaining about 18% in two days, moving from the low-$60,000 area through resistance at $65,000, $70,000, and $75,000.
CoinGlass data cited in the report showed that almost $3 billion in crypto positions had been liquidated as Bitcoin crossed $70,000, with short positions accounting for most of the losses. The ETF data indicated that demand from U.S.-listed funds accompanied the forced buying in derivatives markets.
Ether also moved above $2,400 during the week after gaining about 18% in one 24-hour period. The advance occurred as Ether ETFs posted their largest daily intake since October 2025 on Aug. 20, when the funds collected $221 million.
Ahead of the final two inflow sessions, Nansen senior research analyst Nicolai Søndergaard attributed Bitcoin’s rise to forced short covering, institutional demand and improved liquidity. LVRG Research Director Nick Ruck cautioned that one strong ETF session would not establish a lasting allocation trend.
“Sustained inflows are unlikely without additional confirmation,” Ruck said at the time. “Until those catalysts develop, inflows will likely remain temporary rather than structural.”
Five consecutive positive sessions have since provided more data than the single inflow day available when Ruck made the comment. SoSoValue’s figures show that Bitcoin and Ether funds collected a combined $2.615 billion during the period, reversing the previous week’s combined $391.96 million withdrawal by about $3.01 billion.
BlackRock captures most of Friday’s demand
BlackRock dominated the final session across both categories, receiving a combined $390 million through IBIT and ETHA. The two funds captured about 79% of Friday’s $492 million aggregate Bitcoin and Ether ETF inflows.
IBIT’s $239 million allocation also represented almost four-fifths of the $307 million entering Bitcoin products that day. ETHA accounted for roughly 82% of the $185 million directed toward Ether funds.
By the end of Aug. 21, Bitcoin and Ether ETFs held approximately $110.36 billion in combined net assets. Bitcoin products accounted for $96.07 billion, while Ether products held the remaining $14.30 billion, according to SoSoValue.
