Following a strong August rally that saw Spot Bitcoin [BTC] ETFs attract $3.52 billion in inflows, the trend seems to be shifting in September. From 8th to 11th September, BTC ETFs experienced outflows totaling $462.73 million.
The week began with a negative start, with a combined net outflow of $46.6 million. This was primarily driven by Fidelity’s $17.1 million, Invesco’s $4.7 million, and a significant $65.5 million outflow from Grayscale GBTC.
Bitcoin ETFs Weekly Flow Analysis
On 9th September, selling pressure intensified with BlackRock witnessing a $19.5 million outflow, ARKB losing $78.0 million, and Grayscale GBTC experiencing another $27.2 million outflow, resulting in total net outflows of $120.2 million.


The situation worsened on 10th September, marking the worst day of the week with a net outflow of $282.7 million. However, the outflows eased on 11th September, totaling just $13.2 million.
Over these four days, ETFs collectively saw approximately $462.7 million in cumulative net outflows, with ARKB and Grayscale GBTC being the primary sources of selling pressure.
This coincided with a decline in Bitcoin’s price from around $79K to $77,324.76 at the time of writing, reflecting a 2.9% drop over the past week.
Ethereum ETFs Take a Different Path
While Spot Ethereum [ETH] ETFs typically mirror BTC ETFs’ movements, there was a divergence this time. On 8th September, there was a relatively weak activity, with a total net outflow of $24.3 million.


On 9th September, there was a notable shift, with ETH ETFs recording a total net inflow of $34.7 million. However, selling pressure resurfaced on 10th September.
The most significant change occurred on 11th September when Ethereum ETFs saw a substantial $216.4 million net inflow, the highest positive daily total of the week.
BlackRock ETHA led the way with a significant $148.8 million inflow, followed by BlackRock ETHB with $18.3 million.
Mixed Patterns in Other Altcoins
In addition to Bitcoin and Ethereum, other altcoins exhibited varying flow patterns. The Solana [SOL] ETF saw $10.30 million in inflows over the past week, driven primarily by Bitwise’s BSOL.
Conversely, the XRP ETF recorded no flows, while Hyperliquid [HYPE] ETFs experienced $26.42 million in net outflows during the same period.
Bitcoin Maintains Strength
Despite the mixed flow patterns in altcoins, Bitcoin remains dominant, with an altcoin index of 40 indicating its continued supremacy.


Furthermore, the Crypto Fear and Greed Index currently at 63 in the ‘Greed’ zone indicates bullish investor sentiment, suggesting that the current slowdown may be temporary.


The strong inflows seen in the first week of September, driven by changing macroeconomic factors and U.S. monetary policy expectations, further support the notion of a temporary slowdown.
In Conclusion
- Spot Bitcoin ETFs witnessed weekly outflows of $462.73 million amidst a price decline.
- Altcoin ETFs displayed a mix of inflows and outflows during the same period.
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