US spot Bitcoin ETFs took in $998.9 million in net inflows on Monday, September 21, their largest daily haul of 2026. The figure topped the previous 2026 record of $844 million set on January 14, back when the market was still recovering from a New Year correction. It came exactly one week after the funds posted their weakest weekly inflow on record.
Inflows broke the yearly record
According to SoSoValue, Monday's total was the biggest single-day result since October 6, 2025, when the funds drew more than $1.2 billion. The week through September 18 brought in just $6.2 million in net inflows. That was the weakest showing across 141 weeks of trading for these funds, and Monday's inflow topped it by more than 160 times. That marks one of the sharpest weekly reversals in these funds' history. The sharp reversal came after Bitcoin's price climbed above $87,000 on Monday. SoSoValue aggregates daily flow data across all approved US spot Bitcoin ETFs, so the $998.9 million figure reflects the net difference between share purchases and redemptions that day across all nine funds combined.
Despite Monday's inflow, US spot Bitcoin ETFs remain about $464 million in net outflows for the year so far. Bitcoin was trading near $85,900 at the time, up 4.7% over 24 hours and 12.3% over the past month. Just a week earlier the coin was still stuck between $75,000 and $79,000, so the climb past $87,000 marked a visible shift in market mood.
Who pulled in the most
IBIT has remained the largest Bitcoin ETF by assets since trading launched in January 2024, and it's typically the first fund to register a shift in big investors' mood. BlackRock's IBIT led Monday's haul again, with $381.37 million. Ark 21Shares' ARKB followed with $289.12 million, and Fidelity's FBTC added roughly $238.84 million. The three biggest funds alone accounted for more than $909 million, meaning a handful of players drove nearly the entire day's inflow.
- Morgan Stanley's MSBT added $61.67 million.
- Bitwise's BITB brought in $21.56 million.
- Grayscale's two funds each took in only a few million.
- VanEck's HODL and Valkyrie's BRRR recorded no flows at all.
The gap between the leaders and the rest shows how unevenly investor interest is spread. The three biggest funds by assets keep pulling in the lion's share of new money, while smaller providers are mostly left fighting over whatever demand remains.
Details behind the surge
Trading volume across the funds reached about $4.5 billion, slightly below Friday's $4.6 billion. Bloomberg Intelligence analyst James Seyffart called that figure not especially high given the scale of the move in Bitcoin's price. His colleague Eric Balchunas noted the volume still looked elevated against stock and gold ETFs, and that IBIT ranked among the ten most-traded US ETFs that day.
His colleague Eric Balchunas added that flows booked to a single day usually reflect the previous session's activity. So Monday's numbers likely capture Friday's buying rather than an instant market reaction. Cumulative net inflows since launch reached $56.16 billion, and the funds now hold $110.14 billion in assets, equal to 6.30% of Bitcoin's market capitalization. For comparison, total assets across these funds were measured in the low billions when trading launched in January 2024, so the current figure shows how quickly the asset class has grown within institutional portfolios in under three years.
How the market reacted
CryptoQuant analyst Julio Moreno said Bitcoin had climbed above its 365-day moving average, calling it the final signal needed to confirm a new bull market. Hawkeye Digital president David Wachsman noted that holders sitting on losses tend to sell the first chance they get to break even, so this year's demand has had to push through that selling pressure the whole way.
"Bitcoin's recent recovery toward the $86,000-$87,000 range is being supported by renewed institutional demand, stronger spot ETF inflows and evolving US regulatory developments."
- Vikas Gupta, regional manager for India at Bybit
Gupta added that the market held its ground even through the Fed's rate hike and the failure of the Clarity Act vote in the Senate, which suggests sentiment is responding to more than monetary policy alone. Spot Ethereum ETFs took in about $270 million, their biggest daily inflow of 2026. XRP ETFs recorded no net flows that day, leaving their cumulative inflow at about $1.71 billion. The next few trading sessions will show whether the inflow holds at these new levels or Monday ends up as a one-off spike in activity.
Comments
Your email address will not be published. Required fields are marked *