U.S. spot Bitcoin exchange-traded funds collected $986.9 million in net inflows during the week ended Sept. 4, extending their positive streak to three consecutive weeks, according to data from SoSoValue. The weekly total rose from $924.5 million the prior week, even as overall ETF trading volume declined to $14.5 billion from nearly $19 billion.

BlackRock's iShares Bitcoin Trust (IBIT) captured $691.5 million of the weekly total, roughly 70% of all net creations across the U.S. spot Bitcoin ETF complex. The concentration reinforces IBIT's dominant market position within the group of ten funds approved by the Securities and Exchange Commission in January 2024.

Spot Ethereum ETFs recorded $218.4 million in net inflows over the same period, marking their own third straight positive week. Weekly trading volume for the Ether products fell to $4.1 billion from $6.3 billion.

The divergence between rising inflows and falling turnover is the notable structural signal in the data. Dominick John, an analyst at Zeus Research, said sustained inflows suggest institutions are "steadily rebuilding exposure to Bitcoin," generating spot demand rather than leverage-led speculation. That demand profile, he argued, depends less on derivatives markets and is less exposed to forced liquidations during volatility spikes.

Min Jung, a research associate at Presto Research, characterized the allocation as a "catch-up trade" after crypto lagged other risk assets, and said strong ETF inflows point to "renewed institutional demand."

The weekly figures cap a strong August. Spot Bitcoin ETFs attracted $3.52 billion in net inflows for the month, their largest since September 2025. Spot Ethereum ETFs added $1.85 billion in August, their best month since August 2025.

Bitcoin traded around $79,951 late Sunday after reaching roughly $81,700 last Thursday. "Holding $80,000 keeps the structure constructive," John said, adding that any move toward $82,000 to $85,000 would likely depend on incoming macroeconomic data. Traders are watching U.S. jobless claims due Sept. 10 and the consumer price index release scheduled for Sept. 11.

"A supportive macro backdrop could extend the rally, while a hotter inflation print would be the key downside risk," Jung said.

The flow data carries operational weight for issuers. Three consecutive weeks of net creations at rising weekly totals, against declining secondary-market volume, indicate primary-market accumulation by allocators with longer holding horizons rather than fast-moving trading desks. For issuers, that mix supports asset retention and fee base stability, since redemption pressure remains muted while creations concentrate in the largest fund.

The concentration in IBIT also sharpens the competitive gap within the issuer group. Funds outside BlackRock and Fidelity continue to compete for a shrinking share of net creations, a dynamic that has already pushed smaller products toward fee cuts and differentiated distribution strategies.

Whether the streak extends past three weeks now rests on the macro calendar. The Sept. 10 jobless claims report and the Sept. 11 CPI print will frame the next allocation decision for institutional buyers, with a hotter inflation figure standing as the most direct risk to the current inflow pattern.