Key Takeaways
- • US spot Bitcoin ETFs posted $462.7 million in net outflows for the week ending September 12, 2026, reversing three consecutive weeks of inflows, with the largest single-day withdrawal of $282.7 million occurring on Thursday—the largest daily outflow since July.
- • ARK 21Shares Bitcoin ETF led withdrawals with $234.2 million, followed by Grayscale Bitcoin Trust ($129.1 million), BlackRock iShares Bitcoin Trust ($52.5 million), and Fidelity Wise Origin Bitcoin Fund ($50.7 million).
- • US spot Ether ETFs recorded a contrasting $196.9 million in net inflows over the same four-day period, with BlackRock's iShares Ethereum Trust ETF driving Friday inflows with $148.8 million.
- • Despite the weekly reversal, Bitcoin ETFs maintained positive flow territory for September with approximately $307.3 million in cumulative net inflows through Friday, indicating resilience despite mid-week volatility.
- • Institutional capital flows diverged sharply between Bitcoin and Ether products, signaling differentiated investor sentiment toward the two largest cryptocurrency assets.
Summary
US spot Bitcoin ETFs experienced a significant weekly reversal, shedding $462.7 million in net outflows during the four trading days from Tuesday to Friday (ending September 12, 2026), according to data from Farside Investors. This reversal came after three consecutive weeks of strong inflows, which had represented the most robust inflow run for Bitcoin ETFs in 2026. The initial two trading days of the holiday-shortened week saw $166.8 million in outflows, with selling pressure intensifying substantially on Thursday when Bitcoin ETFs recorded their largest single-day withdrawal since July at $282.7 million. Friday's outflows moderated to $13.2 million but extended the negative streak across all four trading sessions.
The outflows were concentrated among the largest Bitcoin ETF issuers. ARK 21Shares Bitcoin ETF led the weekly redemptions with $234.2 million in net outflows, representing the primary driver of the reversal. Grayscale's Bitcoin Trust ETF followed with $129.1 million in withdrawals, while BlackRock's iShares Bitcoin Trust ETF and Fidelity's Wise Origin Bitcoin Fund recorded more modest outflows of $52.5 million and $50.7 million, respectively. Despite the weekly reversal, the data underscores the volatility inherent in cryptocurrency ETF flows, as the funds remain positioned with approximately $307.3 million in cumulative net inflows for September through Friday, suggesting that longer-term institutional positioning remains supportive.
In a divergent market dynamic, US spot Ether ETFs attracted $196.9 million in net inflows over the same four-day period, moving in the opposite direction of Bitcoin products. Ether ETF flows exhibited mixed performance earlier in the week, with $24.3 million in outflows on Tuesday, $34.7 million in inflows on Wednesday, and $29.9 million in outflows on Thursday. The market shifted decisively on Friday, however, when Ether ETFs recorded a substantial $216.4 million in net inflows. BlackRock's iShares Ethereum Trust ETF led this Friday rally with $148.8 million in inflows, while 21Shares Core Ethereum ETF added $29.1 million. This divergence between Bitcoin and Ether fund flows reflects differentiated institutional views on the two largest cryptocurrency assets, with Ether-denominated products attracting capital as Bitcoin products faced redemption pressure.
The outflows were concentrated among the largest Bitcoin ETF issuers. ARK 21Shares Bitcoin ETF led the weekly redemptions with $234.2 million in net outflows, representing the primary driver of the reversal. Grayscale's Bitcoin Trust ETF followed with $129.1 million in withdrawals, while BlackRock's iShares Bitcoin Trust ETF and Fidelity's Wise Origin Bitcoin Fund recorded more modest outflows of $52.5 million and $50.7 million, respectively. Despite the weekly reversal, the data underscores the volatility inherent in cryptocurrency ETF flows, as the funds remain positioned with approximately $307.3 million in cumulative net inflows for September through Friday, suggesting that longer-term institutional positioning remains supportive.
In a divergent market dynamic, US spot Ether ETFs attracted $196.9 million in net inflows over the same four-day period, moving in the opposite direction of Bitcoin products. Ether ETF flows exhibited mixed performance earlier in the week, with $24.3 million in outflows on Tuesday, $34.7 million in inflows on Wednesday, and $29.9 million in outflows on Thursday. The market shifted decisively on Friday, however, when Ether ETFs recorded a substantial $216.4 million in net inflows. BlackRock's iShares Ethereum Trust ETF led this Friday rally with $148.8 million in inflows, while 21Shares Core Ethereum ETF added $29.1 million. This divergence between Bitcoin and Ether fund flows reflects differentiated institutional views on the two largest cryptocurrency assets, with Ether-denominated products attracting capital as Bitcoin products faced redemption pressure.
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