US spot Bitcoin ETFs pulled in $606.29 million on Thursday, their largest single-day haul since May 1 and the fourth straight day of positive inflows. BlackRock's IBIT alone accounted for $502.99 million of that total — 83% of the day's inflows — a sharp jump from the 55% share it held the day before, according to Farside Investors' flow data.
The four-day run has now pulled in roughly $1.61 billion combined: $297.56 million Monday, $189.30 million Tuesday, $517.19 million Wednesday, and Thursday's $606.29 million. IBIT has captured about $1.09 billion of that stretch, or roughly 68% of the total, underscoring how concentrated the current wave of institutional demand has become around a single fund.
A Record Month, With Seven Sessions Left
August's cumulative Bitcoin ETF inflows now stand at $2.07 billion, already the strongest month of 2026 and ahead of April's previous high of $1.97 billion — with seven trading sessions still remaining before month-end. Net assets across the Bitcoin ETF complex closed Thursday at $90.16 billion, equal to 6.18% of Bitcoin's total market capitalization, while cumulative net inflows since the funds launched on January 11, 2024 have reached $53.40 billion.
Not every fund shared in Thursday's gains. Fidelity's FBTC added $64.74 million, Bitwise's BITB took in $26.4 million, and Ark/21Shares' ARKB brought in $12.2 million, while VanEck's HODL posted a $3.59 million outflow. The divergence highlights how flows are increasingly funneling toward the largest, most liquid funds even during a broadly positive week — a pattern reinforced by Hashdex's DEFI Bitcoin ETF, which shut down entirely in mid-August after its final trading day on August 17 with just $14.7 million in assets, a fraction of IBIT's roughly $47 billion.
Altcoin Funds Finally Show Up
Thursday's flows weren't confined to Bitcoin. US spot Ethereum ETFs recorded $221 million in net inflows, their largest single-day intake since October 2025 and a fourth consecutive positive session. XRP funds added $13 million, up sharply from $2.35 million the day before, while Solana funds pulled in $15 million versus $2.10 million on Wednesday — every listed altcoin ETF category posted gains for the day.
The broad participation across Bitcoin, Ethereum, XRP and Solana funds in a single session marks one of the more synchronized inflow days the ETF market has seen since spot Ethereum products launched.
What's Driving the Rotation
The scale of Thursday's inflow — the biggest single day since May — arrives as Bitcoin has been rebuilding technical footing after a volatile stretch, with the asset recently reclaiming its 200-day moving average for the first time since November. Institutional allocators appear to be using ETF wrappers to re-enter risk assets broadly rather than rotating narrowly into Bitcoin alone, a shift visible in the simultaneous strength across Ethereum, XRP and Solana products. With daily Bitcoin ETF trading volume at $5.41 billion and August already the strongest month of the year with more than a week left to go, the current run of inflows looks less like a one-off spike and more like a sustained re-engagement from institutional buyers.
Related: Crypto Market Adds $280B as $3.5B Short Squeeze Hits Traders
Whether that momentum holds through the remaining seven trading days of August will likely depend on whether Bitcoin's price action itself keeps pace with the capital flowing into the ETFs tracking it.
