US-listed spot Bitcoin ETFs closed the May 4, 2026 session with $532.2 million in net inflows, in a run that now spans nine consecutive sessions of positive balance and roughly $2.7 billion of fresh capital over the last three weeks. May 4 was also the third straight day of positive flow, adding $1.18 billion across that 72-hour stretch.
Capital distribution shows a strong concentration in the two largest operators. BlackRock's iShares Bitcoin Trust (IBIT) drew $335.5 million on May 4, its biggest daily inflow in several weeks. Fidelity Wise Origin Bitcoin Trust (FBTC) added another $184.6 million. Between them the two products absorbed about $520 million of the day's $532 million total. Of the thirteen US-listed spot Bitcoin ETFs, ten logged zero flows and none closed with net outflows. You can track all of them in the ETFs section.
The capital move coincided with Bitcoin's price recovery, which crossed back above the psychological $80,000 threshold at the May 4 close. The correlation between institutional ETF flows and market price has strengthened during the cycle that began in April: the first four weeks after the March lows logged eight consecutive sessions of net inflows totalling more than $2.4 billion, a figure that beats the March record of $1.2 billion.
Aggregate assets in US-listed spot Bitcoin funds passed $100 billion under management in early May, a symbolic mark that places the category among the fastest-growing ETF segments in the history of US financial markets. IBIT alone holds more than $63 billion in assets under management, making it the largest exchange-traded Bitcoin product in the world.
Spot Bitcoin ETF behaviour contrasts with the rest of the crypto segment. Spot Ethereum ETFs, launched in July 2024, logged net outflows in several sessions of the same weeks — a divergence many analysts read as confirmation of Bitcoin's status as a digital reserve asset distinct from the rest of the ecosystem, even among institutional investors with access to multiple products.
For the corporate Bitcoin treasury market, sustained institutional ETF flow has direct implications. Each IBIT or FBTC purchase removes Bitcoin from the global spot market and pushes up the average mNAV premium of listed treasuries. Strategy, MARA Holdings, Twenty One Capital and the rest of the sector see their capacity to issue capital through preferreds and convertibles widen when institutional sentiment cooperates.
Whether the inflow streak continues over the coming days will be the key metric to confirm whether April and May 2026 mark the start of a new cycle of sustained institutional demand or a short-lived technical rally. The first four weeks point in the first direction.