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Bitcoin ETFs Surge to $3.6B Inflows in May, Ethereum Funds Hit 2025 Record

Published 21 May 2025
Eddie Mitchell
Authors
Edited by Insha Zia
Key Takeaways
  • Bitcoin ETFs command $126.8 billion in total net assets, or 5.97% of BTC’s market cap.
  • BTC is currently trading around $106,000; ETH is trading at $2,550.
  • Ethereum ETFs hold $8.7 billion in net assets, representing 2.87% of ETH’s market cap.

Bullish optimism has investors flocking to U.S. spot Bitcoin (BTC) exchange-traded funds (ETFs) in May as monthly inflows soar past $3.6 billion.

Having lagged behind their BTC counterparts, Ethereum (ETH) ETFs have seen some modest inflows in May, making it their best-performing month in 2025.

Bitcoin ETFs

As per data gathered by SoSoValue, Bitcoin ETFs posted $329.02 million in net inflows on May 20, raising this week’s net inflows to $996.46 million.

So far in May, BTC funds have garnered $3.63 billion in monthly net inflows, surpassing April’s $2.97 billion, and entirely reversing the $4.6 billion outflows recorded between February and March.

Bitcoin ETF monthly inflows/outflows.
Bitcoin ETF flows. | Source: SoSoValue.

BlackRock’s top-performing fund, the iShares Bitcoin Trust (IBIT), leads inflows for May 20, pulling in $287.45 million. Its cumulative net inflows now stand at $46.15 billion, commanding $67.9 billion in net assets.

Fidelity’s Wise Origin Bitcoin Fund (FBTC), the second-best performing fund, garnered a modest $23.26 million in net inflows. FBTC has tallied $11.81 billion in cumulative net inflows and holds $21.33 billion in net assets.

As for the smaller gainers, the ARK 21Shares Bitcoin ETF (ARKB) notched $6.36 million, the Grayscale Bitcoin Mini Trust netted $6.16 million, and the Bitwise Bitcoin ETF (BITB) took $5.78 million in net inflows.

Ethereum ETFs

According to SoSoValue, ETH funds have tallied a modest $64.89 million in daily total net inflows as of May 20, 2025.

This brings May’s cumulative total net inflows to $108.58 million, making May their most successful month since January’s $101.16 million.

Ethereum ETF monthly inflows/outflows.
Ethereum ETF flows. | Source: SoSoValue.

As ever, BlackRock’s iShares Ethereum Trust (ETHA) took the lead, drawing $45.04 million in daily net inflows.

It’s the leading ETH ETF by far, having recorded $4.32 billion in cumulative net inflows and commanding $3.24 billion in net assets.

It’s followed by the second-best performing Ethereum fund, Fidelity’s FETH, which tallied $19.85 million in net inflows.

It ranks just under ETHA with $1.43 billion in cumulative net inflows, and now holds a square $1 billion in net assets.

Eddie Mitchell

Eddie is a gaming and crypto writer at CCN. Covering the often weird and wonderful world of Web3 with an adoring, but skeptical eye.

Prior to CCN, Eddie has spent the past seven years working his way through the crypto, finance, and technology industry. He began with PR and journalism with Bitcoin PR Buzz and BitcoinNews.com, eventually working his way to become a copywriter with a dozen firms, including the likes of Polkadot before returning to journalism in 2023.

Having studied Radio production and journalism at University in the UK, Eddie spent a few years making podcasts and presenting on a local London radio station as he built up his writing chops.

A lifelong skateboarder, Eddie can often be found at the skatepark or touring the streets looking for something new to try. That, or kicking back playing JRPGs on his original PSP.

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