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Crypto ETF Weekly | Last week, the net outflow of Bitcoin spot ETFs in the United States was $995 million; the net outflow of Ethereum spot ETFs in the United States was $255 million

Reported by Chaincatcher ·Weex
May 18, 2026· 3 min read
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Key Takeaways
  • • U.S. Bitcoin spot ETFs recorded a net outflow of $995 million last week, with total assets under management reaching $104.29 billion; BlackRock's IBIT led outflows with $317 million in redemptions across six ETFs in net outflow status.
  • • U.S. Ethereum spot ETFs experienced a net outflow of $255 million last week, bringing total net asset value to $12.93 billion; BlackRock's ETHA accounted for $186 million of outflows, with four of the available Ethereum spot ETFs in net outflow positions.
  • • Hong Kong Bitcoin spot ETFs saw modest outflows of 24.91 Bitcoins (approximately $32.3 million in net asset value), with Harvest Bitcoin's holdings declining to 210.92 BTC and Huaxia's position falling to 2,570 BTC.
  • • Avenir Group solidified its position as the largest Bitcoin ETF institutional holder in Asia, maintaining the top ranking in the region for eight consecutive periods.
  • • U.S. Bitcoin spot ETF options showed bullish positioning with a long-short ratio of 1.63 on trading volume and 1.45 on open interest ($23.08 billion), indicating sustained institutional interest despite underlying asset outflows.
Summary
U.S. cryptocurrency spot ETFs experienced significant redemption pressure last week, with Bitcoin and Ethereum vehicles both registering notable net outflows as institutional investors adjusted positions. Bitcoin spot ETFs led the decline with $995 million in net outflows distributed across a three-day trading window, reducing the product category's total net asset value to $104.29 billion. The outflows were concentrated among major issuers, with BlackRock's IBIT contributing $317 million of the total decline. Six Bitcoin spot ETFs were in net outflow states during the period, reflecting broad-based investor repositioning rather than isolated fund-specific redemptions.

Ethereum spot ETFs followed a similar trajectory with $255 million in net outflows over five trading days, bringing the category's total net asset value to $12.93 billion. BlackRock's ETHA accounted for $186 million of Ethereum outflows, with four of the available Ethereum spot ETF products registering net redemptions. The parallel outflows across both Bitcoin and Ethereum products suggest coordinated portfolio rebalancing or risk reduction strategies among institutional participants rather than differentiated cryptocurrency allocation decisions.

International markets showed more modest activity. Hong Kong-listed Bitcoin spot ETFs recorded outflows of 24.91 Bitcoins with a net asset value of approximately $32.3 million. The region's two primary Bitcoin ETF issuers, Harvest Bitcoin and Huaxia, both experienced position reductions, with Harvest's holdings declining to 210.92 BTC and Huaxia's stake falling to 2,570 BTC. Hong Kong's Ethereum spot ETF remained inactive with no capital inflows and a net asset value of $6.813 million, indicating limited institutional demand for Ethereum exposure in the Asian market.

Despite underlying asset outflows, derivatives markets displayed robust positioning with constructive technical indicators. U.S. Bitcoin spot ETF options recorded nominal trading volume of $797 million as of May 14, with a long-short ratio of 1.63, suggesting sustained bullish sentiment among options traders. Open interest in Bitcoin spot ETF options reached $23.08 billion with a long-short ratio of 1.45, indicating that institutional investors maintaining derivative positions despite redemptions in the cash markets.

In Asia, Avenir Group reinforced its dominance as the largest institutional holder of Bitcoin ETFs across the region, extending its top-ranking position for eight consecutive reporting periods. This concentration of regional Bitcoin ETF assets within a single institutional vehicle underscores the continued centralization of Asian crypto exposure among major family offices and institutional allocators.

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Sources

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AlphaMaven summarised this story from the reporting below. Each link opens the original article.

Chaincatcher Crypto ETF Weekly | Last week, the net outflow of Bitcoin spot ETFs in the United States was $995 million; the net outflow of Ethereum spot ETFs in the United States was $255 million Weex Crypto ETF Weekly | Last week, the net inflow for Bitcoin spot ETFs in the U.S. was $996 million; the net inflow for Ethereum spot ETFs in the U.S. was $275 million