Year-to-Date Bitcoin ETF Flows Turn Positive on $1B Day

Interest has moved beyond bitcoin as well: spot ether funds recorded roughly $270 million in inflows during the same session, their strongest performance since October 2025, with BlackRock's ETHA leading the way. Monday marked a third straight day of inflows for the bitcoin ETFs, pushing aggregate net assets past $110 billion. The mood is improving because holders who are in profit are typically less eager to sell during rallies than those waiting to break even. A mix of heavy short covering and new fund buying has also cleared out positions, meaning the next move will rely more on real demand than on forced purchases.

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Bitcoin ETFs have erased this year's outflows, but a portion of the rally came from forced buying, so the real test is whether inflows persist after short positions are gone.

Summary:

• According to Galaxy's Alex Thorn, US spot bitcoin ETF flows for 2026 have become positive for the first time since April, following a session with roughly $1 billion in net inflows.
• Data from SoSoValue recorded Monday, September 21, as having net inflows of $998.95 million, the largest single day of 2026, with IBIT contributing $381.4 million, ARKB $289.1 million and FBTC $238.8 million. Farside has not yet verified these numbers.
• Bloomberg's data shows year-to-date flows around +$320 million, with approximately $4.6 billion entering since August 19, when the US Treasury signaled larger buybacks of long-dated bonds.
• Bitcoin has risen roughly 35% since August 19 and reached $87,395 this week, a level not seen since January.
• The rally saw nearly $919 million in crypto short positions liquidated.
• The average ETF cost basis is estimated between $81,700 and $82,000, meaning the typical holder is now in profit for the first time since January.

Alex Thorn, head of research at Galaxy, said that US spot bitcoin ETFs have returned to net inflows for 2026, with year-to-date flows becoming positive for the first time since April. Thorn posted on X that a session with roughly $1 billion of net inflows had carried the funds past that threshold.

According to SoSoValue data, that session occurred on Monday, September 21, with net inflows of $998.95 million – the biggest day of 2026 and the most since October 2025. BlackRock's IBIT led with $381.4 million, then ARK 21Shares' ARKB at $289.1 million and Fidelity's FBTC at $238.8 million. Farside Investors had not updated its figures at the time, and reports disagree on which session the inflow took place, so the daily numbers remain preliminary until confirmation.

Bloomberg's figures paint a similar picture, with the funds around $320 million positive for the year. About $4.6 billion has come in since August 19, when the US Treasury said it would increase buybacks of long-dated bonds. Over that same stretch, bitcoin has climbed roughly 35%, hitting $87,395 this week, its best since January.

This time around, flows and price are aligned, which hasn't always been true. In the first part of the year, consistent outflows accompanied a falling price. Caution is still warranted in interpreting these inflows as a sign of institutional commitment. According to data cited by Investor's Business Daily, about $919 million of crypto short positions were liquidated during the latest rally. That implies a portion of the price increase was driven by forced buying from traders who had wagered on further drops.

The rise has also altered the standing of ETF holders. Bloomberg analyst James Seyffart calculates the average cost basis at roughly $81,722 per bitcoin, while Pepperstone's Chris Weston places it around $82,000. As a result, the typical holder is back in profit for the first time since January. Weston stated that he does not view the return to breakeven as a clear catalyst for selling.

The next thing to monitor is whether inflows persist once Farside confirms this week's sessions. A series of consistent inflows with price staying above the $82,000 cost-basis zone would support the idea that demand through these products is recovering. A fall back below that level would push the average holder into the red again and test the commitment of the new money. For now, the sensible approach is to watch both the flow trend and the price reaction together before interpreting a single strong day as a turning point.