BlackRock’s Bitcoin ETF Bleeds $448M as Outflows Intensify

The institutional retreat from Bitcoin ETFs is accelerating. U.S. spot Bitcoin ETFs recorded $648.64 million in net outflows on May 18, 2026, according to SoSoValue data. Not a single one of the twelve Bitcoin ETFs posted a positive inflow on the day. BlackRock’s IBIT led the exodus with $448.36 million in withdrawals, the largest single-day outflow the fund has recorded in recent weeks. BlackRock news today signals that even the world’s most dominant Bitcoin ETF is not immune to sustained institutional selling pressure.

The Numbers Behind the Bleeding

BlackRock’s IBIT absorbed $448.36 million in outflows on May 18 alone. Ark Invest and 21Shares’ ARKB followed with $109.64 million in withdrawals, the second-largest single-fund daily exit. Together, those two funds account for the overwhelming majority of the day’s total $648.64 million drain.

iShares Bitcoin Trust (IBIT) Net Flows as of May 18, 2026. Source: SoSoValue

Despite the selling, IBIT’s total historical cumulative net inflow still stands at $65.33 billion. It’s a figure that reflects the enormous capital that entered the product since its January 2024 launch. Total Bitcoin ETF net assets have now fallen to $100.49 billion. This represents 6.52% of Bitcoin’s total market capitalization. Cumulative net inflows across all Bitcoin ETFs sit at $57.69 billion.

IBIT shares closed at $43.45 on May 18, down 0.18% on the day. The fund is now down 13.6% year-to-date and 25.32% over the past twelve months. It reflects Bitcoin’s broader price compression since its late 2025 peak near $71.82 per IBIT share.

Ethereum and the Broader Pressure

Bitcoin ETF news today does not tell the whole story. Ethereum ETF flows are equally concerning. Spot Ethereum ETFs recorded $86.31 million in net outflows on May 18. This marks the sixth consecutive day of withdrawals. That unbroken losing streak reflects sustained institutional de-risking across the entire crypto ETF complex, not just Bitcoin.

The macro backdrop is driving both trends. Rising Treasury yields are pulling institutional capital toward fixed income. Risk-off sentiment following recent macroeconomic data is reducing appetite for volatile assets broadly. Bitcoin is struggling to reclaim the $82,000 level that would confirm a recovery above its 200-day moving average.

What This Means for Investors

For Bitcoin ETF news today followers, the $648 million single-day outflow is the largest since the January correction period. However, context matters. Total net assets remain above $100 billion. Cumulative inflows since launch still exceed $57 billion. The structure of institutional demand has not collapsed; it is pausing under macro pressure.

For crypto news watchers tracking IBIT specifically. The fund’s $62.2 billion in net assets and 4.04% share of total Bitcoin market cap confirm its continued dominance. BlackRock’s product holds more Bitcoin than any other ETF by a significant margin. The six-week inflow streak that ended last week is now followed by back-to-back days of heavy outflows. Whether this becomes a sustained correction or a temporary pause depends on one variable. Whether Bitcoin can reclaim and hold $82,000 convincingly in the coming sessions.