Spot Bitcoin ETFs Lead $1 Billion Crypto Surge as Ethereum Follows
Institutional appetite for digital assets shows no signs of cooling, with spot exchange-traded funds tied to Bitcoin and Ethereum logging another wave of heavy inflows on September 12.
Combined, the two asset classes drew more than $1 billion in net new capital, extending their multi-day streaks of investor interest.
Bitcoin ETFs Lead With Strong Gains
Bitcoin products captured the bulk of activity, bringing in $642 million in a single day. Fidelity’s FBTC was the top performer with $315 million in inflows, while BlackRock’s IBIT added $265 million. Smaller contributions came from Bitwise BITB ($29 million), Ark & 21Shares ($19 million), VanEck HODL ($8 million), and Grayscale BTC ($6 million).
Trading volume across all Bitcoin ETFs reached nearly $3.9 billion, with combined net assets now standing at $153 billion. That figure represents more than 6.6% of Bitcoin’s total market capitalization — a sign of the growing influence institutional vehicles wield over the asset.
Ethereum ETFs Pick Up Momentum
Ethereum funds also had a strong showing, booking $406 million in net inflows. BlackRock’s ETHA led with $166 million, narrowly edging out Fidelity’s FETH at $163 million. Other notable contributions came from Grayscale’s ETHE ($24 million) and ETH trust ($18 million), as well as Bitwise ETHW ($17 million).
Smaller but steady additions were made by 21Shares TETH ($7 million) and VanEck ETHV ($7 million). In total, ETH ETF trading volumes reached $2.55 billion, with $30.3 billion in net assets — equal to 5.4% of Ethereum’s market cap, slightly higher than the prior day.
Market Setting
The ETF momentum is playing out against a backdrop of renewed price strength in both majors. Bitcoin traded at $115,846 on the day, supported by a $2.3 trillion market cap and daily turnover above $46 billion. Ethereum hovered near $4,725, its highest level this month, with trading volumes climbing past $39 billion.
The persistent inflows underscore how spot ETFs are cementing themselves as a primary gateway for institutional capital into crypto. Analysts say the combination of strong trading activity, favorable regulatory tailwinds, and heightened global demand for digital assets has created an environment where ETFs are no longer just complementary products — they are becoming central to market structure.
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Alex is Editor-in-Chief of Coindoo and co-founder of Millennial Media Group, with nearly a decade of experience covering financial markets - crypto first, then everything else. It started in 2016 with Bitcoin. Like most people at the time, he didn't fully understand it - so he kept digging. Blockchain, tokenomics, the projects, the cycles. That curiosity never stopped, and eventually pulled him into traditional markets too: equities, commodities, macro. Not because he left crypto behind, but because you can't properly understand one without the other. What drives him is straightforward: he wants to know why something is happening, not just that it's happening. Most market coverage stops at the headline - price up, price down, here's a chart. Alex finds that kind of reporting actively unhelpful. If you walk away from an article without understanding the mechanism behind the move, what did you actually learn? He holds a degree in Tourism from New Bulgarian University - not the most obvious path into financial markets, but markets have a way of pulling in people who are simply too curious to stay out. He has authored over 200 in-depth analyses and more than 10,000 articles across crypto and traditional finance. He still thinks every day in markets teaches him something new. That's probably why he hasn't stopped.
