U.S.-listed spot Bitcoin exchange-traded funds posted approximately $208.1 million in net outflows on May 18, extending the sector's recent streak of institutional withdrawals. The outflows occurred as Bitcoin traded near the $76,000 level following a sharp multi-day correction across crypto markets. According to ETF flow data compiled by Bitbo and other market trackers, no major Bitcoin ETF recorded meaningful inflows during the trading day, underscoring continued institutional caution. Rising bond yields, inflation concerns, and broader geopolitical uncertainty weakened demand for risk assets globally, with institutional investors reducing exposure to volatile assets as expectations for prolonged higher interest rates strengthened.
## Daily ETF Flow Breakdown
Ark 21Shares' ARKB recorded the largest single-day withdrawal at approximately $110.1 million. Fidelity's FBTC saw around $38.5 million in net outflows, while Grayscale's GBTC posted another $43.5 million in redemptions. Bitwise's BITB experienced roughly $9.2 million in outflows, and Franklin Templeton's EZBC lost approximately $6.6 million during the session.
Bitcoin briefly fell below $76,700 during the session, marking its lowest level in roughly two weeks before stabilizing modestly higher late in trading.
## Institutional Risk Appetite Weakens
The May 18 outflows followed an already difficult week for crypto investment products. Industry reports showed digital asset exchange-traded products experienced approximately $1 billion in cumulative outflows over the previous week, ending a six-week inflow streak that had supported Bitcoin's earlier rally above $80,000.
The latest ETF withdrawals represented a significant reversal from the strong inflow environment seen throughout April. U.S. spot Bitcoin ETFs attracted approximately $2.44 billion in net inflows during April 2026, the strongest monthly performance of the year, driven largely by institutional accumulation through BlackRock's IBIT and Fidelity's FBTC products.
Market participants increasingly view ETF flows as one of the most important indicators of institutional sentiment in crypto markets. Since the launch of spot Bitcoin ETFs in the United States, daily flow activity has become closely tied to Bitcoin price momentum and broader liquidity conditions across digital asset markets.
Despite recent outflows, total assets under management across U.S. spot Bitcoin ETFs remain above $100 billion, highlighting the scale of institutional participation that has entered the market since ETF approvals in early 2024. Analysts noted that even periods of large outflows remain relatively small compared with the cumulative capital that has flowed into Bitcoin ETFs over the longer term.
## Ethereum ETFs Continue Underperforming
Ethereum-linked ETFs also faced sustained selling pressure on May 18. U.S. spot Ethereum ETFs recorded approximately $86.4 million in net outflows, extending their losing streak to six consecutive trading sessions. BlackRock's ETHA and Fidelity's Ethereum products reportedly accounted for a significant portion of the withdrawals.
The divergence between Bitcoin and Ethereum institutional flows has widened throughout 2026 as investors increasingly treat Bitcoin as the dominant macro digital asset allocation. Ethereum has continued underperforming Bitcoin despite growing institutional interest in tokenization and decentralized finance infrastructure.
Crypto markets broadly remained under pressure as leveraged liquidations accelerated across derivatives exchanges. Analysts estimated that total crypto liquidations exceeded $650 million over the previous 24 hours as traders unwound bullish positions following Bitcoin's drop below key technical support levels.
