US spot bitcoin ETFs pulled in $517 million on Aug. 19, their largest daily inflow since early May, while ether funds added $189 million, their biggest since October 2025. The flows arrived as bitcoin climbed above $69,000 and ether jumped 18%, a rally analysts attributed to a US Treasury buyback expansion and a new SEC crypto proposal.
US spot bitcoin ETFs took in $517 million on Aug. 19, their largest daily inflow since early May. Ether ETFs pulled in $189 million, their biggest haul since October 2025. The Block put the bitcoin figure's precedent at May 4 — three months and 16 days earlier.
Institutional money returns
Eight of the 12 bitcoin ETFs recorded net inflows on the day, led by BlackRock's IBIT with $284.7 million. Ark & 21Shares' ARKB brought in $77.7 million, and Fidelity's FBTC added $62.4 million. XRP and Solana funds logged small inflows, while Hyperliquid's product was the lone outflow, at about $2 million.
Bitcoin tops $69,000 as shorts unwind
Bitcoin rose above $69,000 and ether climbed 18% to around $2,250 in a broad rally. Bearish crypto bets lost a record $2.7 billion as bitcoin surged toward $70,000, the kind of short position unwind that fires when a market breaks a long range with leverage positioned the wrong way.
Treasury buyback and SEC proposal behind the move
The US Treasury Department said it will at least double the size of liquidity support buyback operations for longer-dated nominal coupon securities across the 10- to 30-year segment. A day earlier, the SEC proposed a rule creating two exemptions for certain crypto investment contracts, letting issuers raise up to $5 million over four years or $75 million annually under disclosure requirements.
According to The Block: "it's a natural reaction to the Department of Treasury's buyback announcement", Jeff Mei, COO of BTSE, said of the ETF inflows.
Whether the flows hold
Rachael Lucas, a crypto analyst at BTC Markets, said the print signals renewed institutional positioning rather than retail chasing the move. Both Lucas and Mei said the inflows are unlikely to continue at this magnitude, though. Mei added that continuation depends on inflation data and how the US-Iran conflict evolves, pointing to next week's CPI print and any Treasury commentary on whether the buyback strategy holds.
A single day of large inflows confirms the breakout but not its durability, and bitcoin has faked out of this range before. A second and third day of ETF buying at this scale would mark the sustained institutional bid missing since spring, while a quick reversal would put the $64,000 level back in play as support.
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