Bitcoin ETF Add Nearly $1B as Year-to-Date Flows Stay Negative

US spot Bitcoin ETF attracted approximately $986.9 million in net inflows for the week ending September 5.

The weekly result extended a three-week streak that brought roughly $3.8 billion into the products.

Early 2026 had been difficult for Bitcoin ETF flows. Despite the recent three-week run of inflows, year-to-date net flows remained approximately $1 billion negative, indicating that the earlier outflows had not yet been fully offset.

Bitcoin ETF Post Strongest August Since 2025, But Weekly Flows Cool as Only IBIT and FBTC See Friday Gains

US spot $BTC ETFs just printed their biggest inflow day since January.

On September 3, the funds pulled in roughly $731 million.

BlackRock’s IBIT accounted for $454 million of that.

And then the buying kept coming.

$3.8 billion flowed into spot Bitcoin ETFs over the last… pic.twitter.com/aGSb7bpUeW

— The Wolf Of All Streets (@scottmelker) September 6, 2026

The week’s flows were unevenly distributed across daily sessions. Thursday accounted for roughly $731 million in net new capital, marking the largest single-day total since January 14. Friday’s net inflow then slowed to $174.6 million.

BlackRock’s iShares Bitcoin Trust (IBIT) recorded $117.4 million of Friday’s total, while Fidelity’s Wise Origin Bitcoin Fund (FBTC) added $57.2 million. Supplementary reporting identified IBIT and FBTC as the only two products with positive net flows on that session; the other ten tracked funds recorded zero net flows rather than net outflows.

August 2026 delivered $3.5 billion in total Bitcoin ETF inflows, the strongest monthly figure since September 2025, according to the primary reporting. That monthly result and the subsequent three-week streak narrowed the year-to-date deficit, but did not turn the balance positive.

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ETF rebound meets a mixed crypto fund backdrop

The Bitcoin ETF inflow figures came alongside weaker reported flows for other crypto ETF products. Spot Ether ETF inflows fell 74% week over week, while XRP ETF products recorded an 83% decline over the same period.

Combined assets under management across US spot Bitcoin ETFs stood at $101.3 billion in the latest data, after briefly reaching $103.3 billion during the week. Since their collective launch in January 2024, the funds had accumulated $55.6 billion in cumulative net inflows.

The $101.3 billion in combined assets under management are a significant share of Bitcoin’s market capitalization. At prices near $80,000, sources estimated Bitcoin’s fully diluted market capitalization at roughly $1.6 trillion.

The ETFs collectively hold somewhere around 6% of all Bitcoin that will ever exist. That estimate applies to the funds’ combined assets under management, not to their cumulative net inflows.

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The $80,000 question remains open

Bitcoin is trading around $78,276, down 1.44% today and still short of reclaiming the $80,000 level after last week’s brief dip below $79,000.

Altcoins are mostly in the red: Ethereum at $2,470 (-0.80%), XRP at $1.39 (-0.60%), and Solana at $102.68 (-2.17%), giving back some of its recent 40% monthly run. BNB is the outlier, up 0.85% to $751, while stablecoins USDT and USDC hold near their $1 peg as usual.

The pullback tracks with renewed US-Iran tension. Strikes on vessels near the Strait of Hormuz have revived fears of a prolonged disruption to Middle East oil flows: a route that normally carries roughly a fifth of global crude supply. Brent crude has climbed toward the high-$90s and WTI has pushed above $90 a barrel over the past week.

That kind of geopolitical and energy-market stress typically weighs on risk assets broadly, and crypto looks to be feeling it despite the sector’s continued ETF inflows.