US spot bitcoin exchange-traded funds recorded $517.19 million in net inflows on Wednesday, August 19, marking their strongest single-day performance since May 4. The surge reversed a prior stretch of outflows and coincided with a sharp rally that carried bitcoin above $69,000 and later toward $72,000.

Data from market trackers showed BlackRock’s iShares Bitcoin Trust leading with $284.7 million, accounting for roughly 55 percent of the day’s total. ARK 21Shares’ ARKB followed with $77.7 million, while Fidelity’s FBTC added $62.4 million. Eight of the twelve available funds finished in positive territory.

Weekly Momentum Builds After Earlier Outflows

The Wednesday total helped lift August net inflows for the bitcoin products to approximately $1.47 billion. Combined inflows since Monday reached about $1 billion, the strongest weekly showing since the period ending January 16. That earlier week had drawn roughly $1.42 billion.

The rebound followed a weaker stretch earlier in the month. From August 10 through August 14 the group posted a net outflow of $389.7 million, with four of the five sessions negative. Positive flows of $297.56 million on August 17 and $189.30 million on August 18 set the stage for the larger Wednesday print.

After the latest session, the funds’ combined net assets stood near $84.31 billion, representing about 6.08 percent of bitcoin’s market capitalization.

Ether ETFs Join the Advance

Spot ether exchange-traded funds also drew strong interest, recording $189.2 million in net inflows on the same day. That figure represented their largest daily intake since October 2025 and brought the week’s total for ether products to roughly $291.5 million.

The simultaneous strength across both major asset classes pointed to broader institutional participation rather than a rotation limited to a single token. Smaller products tracking XRP and Solana also registered modest positive flows, while one derivative-focused vehicle saw a minor outflow.

Macro and Policy Catalysts Align

The inflow surge arrived alongside two notable policy developments. The US Treasury announced it would at least double the size of its buyback operations for longer-dated securities, raising the maximum from $2 billion to at least $4 billion per operation for 10- to 30-year maturities beginning September 9. The move aimed to support liquidity in those markets.

On the regulatory side, the Securities and Exchange Commission proposed a new framework called Regulation Crypto Assets. The proposal would create tailored exemptions allowing certain issuers to raise up to $5 million over four years or up to $75 million annually under lighter registration requirements. Attention also returned to the CLARITY Act following public comments from President Donald Trump urging congressional progress.

Bitcoin traded near $72,000 on Thursday, up approximately 11 percent over 24 hours. Ether advanced roughly 18 to 19 percent to levels around $2,286 to $2,300. The price action triggered substantial short liquidations across crypto markets, with estimates exceeding $2.7 billion as leveraged positions against the rally were forced closed.

Market participants continued to monitor whether the elevated daily flows would persist beyond the immediate reaction to Treasury and regulatory headlines. Subsequent sessions, movements in yields and the dollar, and any further clarity on US digital-asset policy were expected to shape the next phase of institutional activity.