- Bitcoin ETFs: 1-day outflow of 2,148 BTC ($165.46M) on Sept 10 — 25.0% of the 7-day net inflow reversed in one session
- Ethereum ETFs: 1-day outflow of 9,540 ETH ($23.2M) — 24.4% of the 7-day net inflow of $94.95M, matching BTC's ratio
- 7-day nets remain positive: Bitcoin +$661.59M, Ethereum +$94.95M — Bitcoin ETF flows 6.97× larger than ETH in weekly terms
- BTC trading at $77,113 (−2.10% 24h) as daily ETF outflows align with spot price weakness
BREAKING
Bitcoin spot ETFs absorbed a sharp one-day reversal on September 10, recording a net outflow of 2,148 BTC ($165.46M) — while the rolling 7-day window continues to hold a net inflow of 8,587 BTC ($661.59M), according to Lookonchain. Ethereum ETFs mirrored the daily direction, shedding 9,540 ETH ($23.2M) on the day against a 7-day net inflow of 39,046 ETH ($94.95M).
At the time of writing, Bitcoin is trading at approximately $77,113, down 2.10% over the past 24 hours.
September 10 ETF Snapshot — Bitcoin and Ethereum
The full flow picture for both asset classes on September 10:
| Asset | 1-Day NetFlow | 7-Day NetFlow |
|---|---|---|
| Bitcoin (BTC) | −2,148 BTC (−$165.46M) 🔴 | +8,587 BTC (+$661.59M) 🟢 |
| Ethereum (ETH) | −9,540 ETH (−$23.2M) 🔴 | +39,046 ETH (+$94.95M) 🟢 |
Source: Lookonchain, September 10, 2026
CoinsProbe Computed: What the Ratios Say
The relationship between single-day outflows and the 7-day cumulative window is the critical ratio here. For Bitcoin ETFs, the September 10 daily outflow of $165.46M represents 25.0% of the entire 7-day inflow total ($165.46M ÷ $661.59M). In coin terms, today’s 2,148 BTC exit equals 25.01% of the 8,587 BTC that entered over the trailing week.
Put differently: a single session reversed one-quarter of a full week’s accumulation.
For Ethereum ETFs, the ratio is tighter. The $23.2M single-day outflow represents 24.43% of the 7-day net inflow of $94.95M. The coin-denominated ratio is comparable: 9,540 ETH is 24.43% of the 39,046 ETH accumulated across seven days.
| Asset | 1D Outflow | 7D Inflow | Daily-to-Weekly Ratio |
|---|---|---|---|
| Bitcoin | $165.46M | $661.59M | 25.0% |
| Ethereum | $23.2M | $94.95M | 24.4% |
CoinsProbe calculation | Source data: Lookonchain
The near-identical ratio across both asset classes — 25.0% for BTC, 24.4% for ETH — is notable. Both markets moved in parallel proportion, suggesting the September 10 outflow was a broad institutional pause rather than an asset-specific rotation out of one vehicle.
Dollar-Weight Comparison: BTC vs ETH ETF Flows
Bitcoin ETF flows continue to dominate Ethereum ETF flows in absolute dollar terms by a significant margin. On a 7-day basis, Bitcoin ETF net inflows of $661.59M are 6.97× the size of Ethereum ETF net inflows of $94.95M. On the daily outflow side, Bitcoin’s $165.46M exit is 7.13× larger than Ethereum’s $23.2M redemption.
The consistent ~7× multiplier across both the inflow and outflow windows confirms that the two ETF markets are moving in structural proportion, with Bitcoin commanding the larger institutional allocation in both directions.
Context: Where September Stands
The September 10 session adds to a month that has already seen significant two-way flow activity. As covered previously, Bitcoin ETFs posted back-to-back outflow days earlier in the month, with a single $147.3M exit leaving September’s cumulative total at +$622.7M at that point. The week of September 4 was also notable — Bitcoin spot ETFs pulled $987M over that week, sustaining a three-week inflow streak.
Today’s session does not break the 7-day positive structure. The 7-day net for Bitcoin ETFs remains firmly positive at +$661.59M as of September 10. What today’s data does confirm is that the daily flow is volatile within an otherwise constructive weekly trend.
What the Data Confirms — And What It Doesn’t
What it confirms: On September 10, institutional participants in both Bitcoin and Ethereum spot ETFs were net sellers on a daily basis. The symmetry of the ~25% daily-to-weekly ratio across both assets suggests a coordinated or macro-driven single-session redemption, not asset-specific repositioning.
What it doesn’t confirm: A trend reversal. The 7-day net inflow for Bitcoin ETFs remains +$661.59M, and for Ethereum +$94.95M. One session of outflows within a positive weekly window is a data point, not a directional signal.
What to watch: Whether the September 11 session produces a second consecutive daily outflow. If the daily outflow run extends and begins to erode the 7-day net below +$500M for Bitcoin, that would represent a structurally meaningful deterioration of the weekly trend.
Bottom Line
Bitcoin ETFs shed 2,148 BTC ($165.46M) on September 10 — exactly 25.0% of the prior 7-day cumulative inflow of 8,587 BTC ($661.59M) in a single session. Ethereum ETFs followed the same template, with 9,540 ETH ($23.2M) exiting, equal to 24.4% of the 7-day net. The near-identical ratio across both asset classes points to macro-driven redemptions rather than asset-specific selling. The 7-day net for both markets remains positive. Watch whether September 11 produces a second consecutive outflow day — a repeat would begin to compress the weekly inflow cushion that currently stands at $661.59M for Bitcoin and $94.95M for Ethereum.
Frequently Asked Questions
How large was the Bitcoin ETF outflow on September 10, 2026?
Did Ethereum ETFs also see outflows on September 10?
How do Bitcoin ETF flows compare to Ethereum ETF flows on a 7-day basis?
Does the September 10 outflow signal a trend reversal for Bitcoin ETFs?
Source: Lookonchain · Published by CoinsProbe Markets Desk
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