Bitcoin ETF holders are back above water for the first time since January, after a Monday session that pulled nearly $1 billion into US spot bitcoin funds. Net inflows reached $998.95 million, the largest single day since October 6, 2025, when bitcoin set its record near $126,200. The rally carried BTC through the estimated average cost basis of the ETF complex, a level BTC had not held since January. Allocators have moved past whether institutions are still buying, toward whether that bid survives a year that remains negative on net flows.
The Read
- Spot bitcoin ETFs took in $998.95M on Monday, the ninth-largest day since launch.
- BTC cleared the average ETF cost basis, estimated at $81,722.
- Year to date, the funds are still down $450M on net flows.
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ChatGPTIBIT, ARKB and FBTC Drive a $998.95M Monday
US-listed spot bitcoin ETFs registered $998.95 million of net inflows on Monday. BlackRock’s IBIT led with $381.37 million, followed by Ark’s ARKB at $289.12 million and Fidelity’s FBTC at $238.84 million. It was the ninth-largest daily inflow since the funds started trading on January 11, 2024.
The print extended a three-day gain streak, the first in two weeks. Friday alone had brought $433 million, with FBTC taking $310.7 million and IBIT $108.4 million. Yet the week that ended on Friday closed with a net inflow of just $6.2 million, because other bitcoin funds lost roughly $194.4 million over the same five sessions.
Monday’s surge also changes the monthly picture. September inflows now total $1.31 billion, after $3.52 billion in August. That run follows the streak that took bitcoin ETF inflows to a three-week, $3.8B stretch in early September, and it puts BlackRock back in the lead after IBIT had pulled $693M of a single week’s inflows in August.
The flows came on a day when bitcoin gained more than 7% and touched $87,000 on Coinbase and Binance, its highest level since late January. The bid arrived after a Senate vote and a Fed hike that both argued against it: the Clarity Act failed its 49-50 cloture vote on September 15, and the Fed lifted the top of its target range to 4%.
Why the $81,722 Cost Basis Matters for Bitcoin ETF Holders
Bloomberg ETF analyst James Seyffart flagged the turn on X, noting that the average bitcoin ETF holder is back in the green for the first time since January. His estimate puts the average cost basis at $81,722 per bitcoin. Other calculations place it at $82,225. Either way, BTC traded above both on Monday.
Here is why that line carries weight. Below it, the average holder can only sell at a loss or wait to get back to break-even. Above it, every redemption locks in a gain and every new allocation starts from a book already in profit. For Bitcoin ETF holders who bought through the spring, Monday is the first session since January spent on the right side of that line.
The composition of demand points the same way. In its analysis posted on X, Glassnode said spot buyers are leading the trend, while leverage is slowly rebuilding in options and funding rates on perpetual futures remain below neutral. Spot-led demand is the profile ETF allocators want to see, since it is less exposed to a forced unwind than a futures-driven rally.
Scale sets the context. Cumulative net inflows since launch stood at $55.16 billion as of Friday, with net assets of $102.53 billion. Against that base, a near-$1 billion day is meaningful but not transformative, and it lands in a year where the complex was still down $1.45 billion on Friday.
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A Holder Base Back in Profit Can Turn Flows Into a Tailwind
The bull case starts with sentiment repair. Bitcoin ETF holders who spent most of 2026 underwater are now in the green, and the average holder no longer has a break-even target to sell into. If that shift holds, redemption pressure near $82,000 should ease, which removes a cap that shaped flows for months.
Momentum is building from a low base. Year-to-date flows have narrowed from a $1.45 billion deficit on Friday to $450 million after Monday. One more day on the scale of Monday would be enough to erase the remaining deficit and turn 2026 positive for the complex.
Price action supports the read. Bitcoin is up 44% over the third quarter, ahead of every other major asset including gold. Corporate treasuries are buying again, and the quality of demand remains spot-led, which gives the ETF bid a firmer footing than a move carried by futures alone.
A Negative Year and Fragile Ether Flows Keep the Bear Case Alive
The bear case begins with the scoreboard. Even after Monday, spot bitcoin ETFs remain $450 million in the red for 2026. The year includes a June outflow of $4.51 billion, and earlier this summer the complex went through phases like the one when bitcoin ETF outflows hit $4.37B as IBIT and FBTC bled.
Demand breadth is thin, which matters for Bitcoin ETF holders counting on a broad bid. Last week’s total rested on two funds, while the rest of the bitcoin ETF lineup lost about $194.4 million. Ether funds also snapped a four-week inflow streak with $140 million of weekly outflows, including $56.1 million from BlackRock’s ETHA and $25.8 million from Fidelity’s FETH.
A final risk for Bitcoin ETF holders sits in the cost basis itself. With BTC only a few thousand dollars above $81,722, a pullback of that size would put Bitcoin ETF holders back underwater. A retest of the cost basis would turn Monday’s relief into another break-even trap, and the next flow prints would show whether holders defend that level or use it to exit.
More to come.
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