ARK Bitcoin ETF Posts $109.6M Single-Day Outflow
The ARK 21Shares Bitcoin ETF shed $109.6M on May 19, one of its largest single-day exits on record, as U.S. spot Bitcoin (BTC) funds posted a combined $331M net outflow for the day. BlackRock’s iShares Bitcoin Trust drove $326M of that figure. Spot Ethereum (ETH) ETFs added $62.3M in losses, bringing total cryptocurrency fund outflows to $393M on the day.
ARK Outflow in Context
The ARKB fund’s $109.6M exit is among the sharpest single-session losses for that product in 2026.
A TipRanks report published May 20 described it as a rare large-scale institutional pullback from the fund. The broader Bitcoin ETF complex saw its largest single-day outflow of 2026 on May 19 at $635M, according to reporting aggregated across market sources.
Bitcoin held near $77,593 in mid-morning trading on May 20 after a 0.9% move over 24 hours.
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Background
U.S. spot Bitcoin ETFs launched in January 2024 and pulled in roughly $2 billion in net inflows during April 2026 alone, driven by institutional allocation and improving macro sentiment. The May 19 outflow reverses a stretch of consistent positive flows and raises questions about whether that accumulation cycle has stalled.
A BlockchainReporter summary published May 20 confirmed BlackRock’s IBIT accounted for $326M of the $331M Bitcoin ETF net outflow. Bitwise’s ETHW was the only spot Ethereum (ETH) ETF to record a positive flow on the day, adding $0.76M against the broader $62.3M Ethereum ETF net loss.
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What to Watch
Whether May closes with net positive or negative ETF flows will set the tone for institutional appetite heading into the summer.
April’s $2B inflow total gives the asset class cushion, but a second consecutive week of large daily outflows would test that narrative. Spot Ethereum ETF flows have lagged Bitcoin consistently this cycle, and the May 19 session extended that gap further.
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