Bitcoin and ether ETFs post best week of 2026 at $2.6 billion — and are still down on the year

U.S. spot bitcoin and ether ETFs took in a combined $2.6 billion in net inflows during the week ending Aug. 21, the strongest week for the two categories since October 2025, according to The Block's analysis of SoSoValue data published Aug. 22.

Bitcoin funds accounted for $1.9 billion of that, their largest weekly haul since the week ending Oct. 10, 2025, when they drew $2.7 billion. Ether funds took $697.2 million. Both figures reverse the prior week, when the two categories shed a combined $392.0 million — a week-over-week swing of roughly $3 billion — and more than double the $1.1 billion combined inflow of the week ending Aug. 7, which had itself been the best result since April.

Trading volume moved harder than the flows. Bitcoin ETF volume rose to $22.1 billion from $6.9 billion, an increase of more than 219%, per SoSoValue. Ether ETF volume went to $6.9 billion from $1.9 billion, up 259.4%. Bitcoin fund net assets climbed 25.4% to $96.1 billion; ether fund net assets rose 35.9% to $14.3 billion.

The buying clustered midweek. Bitcoin funds drew $517.2 million on Wednesday — their largest single day since May 4 — and $606.3 million on Thursday, of which $503.0 million went into BlackRock's IBIT, The Block reported.

Prices moved with the flows. Bitcoin traded briefly above $79,000 on Friday in what The Block called its largest weekly gain in two years, with bitcoin and ether each up between 24% and 28% on the week. By Saturday afternoon bitcoin was near $77,200 and ether around $2,423, per The Block's price pages.

Key facts

• Combined net inflows: $2.6 billion (bitcoin $1.9B, ether $697.2M) — The Block, citing SoSoValue
• Prior week: –$392.0 million combined; ether alone was –$2.3 million — SoSoValue
• Cumulative since launch: $53.7 billion (bitcoin), $12.2 billion (ether) — SoSoValue
• 2026 year-to-date: bitcoin ETFs –$2.9 billion, ether ETFs –$191.8 million; combined YTD deficit narrowed from $5.7B to $3.1B — The Block
• Ether fund net assets now exceed cumulative inflows by ~$2.1 billion, versus ~$711 million below two weeks earlier — The Block's prior analysis

The real-world read

"Best week of 2026" is a low bar. Both categories are still net redeemers for the year — bitcoin by $2.9 billion — so one strong week narrowed a hole rather than filling it. The 25.4% and 35.9% jumps in net assets are not inflow measures: The Block explicitly attributes them to price appreciation as well as new money, and with spot up 24–28% on the week, most of that increase is mark-to-market, not buying.

The ether asset-versus-inflow flip — from $711 million underwater to $2.1 billion above — is the same effect, and The Block says so. Meanwhile a $79,000 bitcoin print described as the largest weekly gain in two years implies a drawdown deep enough to make it possible; nothing here says what caused the rally.

Two caveats on provenance. Every number traces to SoSoValue, an aggregator, not to issuer filings, and The Block's chain of citations is heavily to its own earlier pieces. The Block also discloses that Foresight Ventures is its majority investor and that exchange Bitget is an anchor LP in that fund.

Opinion, and whose

None on offer. No analyst forecast, issuer comment, or explanation of the rally's driver appears in The Block's report — the piece is flow data and price levels only. Treat any framing of one week as a trend as unattributed.

Sources

• The Block, Zack Abrams (Aug. 22, 2026) — all flow, volume, net-asset and year-to-date figures; price levels; the Wednesday/Thursday daily breakdown and IBIT's $503.0 million. Underlying flow data is SoSoValue's. Independent reporting, not sponsored; carries the disclosure noted above.
• SoSoValue — the primary flow dataset, via The Block. No issuer-level filing has been cited to confirm it.

Nothing here is investment advice.