A $1.29 billion dark pool block trade in BlackRock’s IShares Bitcoin Trust (IBIT) passed through the Nasdaq on Tuesday morning, drawing immediate attention from institutional investors and crypto analysts who track exchange-traded fund (ETF) flows.
Important points:
- BlackRock’s IBIT traded $1.29 billion in dark pool blocks on May 26, 2026, making it the largest issuance for a single institutional Bitcoin ETF in history.
- Galaxy Research’s Alex Thorne estimated the deal was worth about $16,400. $BTCStill, IBIT closed at just $42.99.
- Wednesday’s ETF flow data will confirm whether the trade trigger records a single-day Bitcoin ETF outflow or reflects a simple rebalancing. At the time of publication, statistics have not been released.
BlackRock Bitcoin ETF enables the largest block trading for institutional investors
The order was executed around 10:30 a.m. ET at a price of approximately $43.16 per share and covered approximately 29 million shares, according to multiple reports. Bloomberg ETF analysts Eric Balchunas and James Seifert confirmed that the trade was an intermarket sweep order. One candlestick generated on IBIT’s chart exceeded the fund’s typical daily trading volume.
Alex Thorne of Galaxy Research said this was the largest IBIT block trade he had seen. “At 10:30 a.m. today, a massive $1.289 billion IBIT block sale was conducted by an unknown party through a dark pool. The largest transaction we have ever seen,” Thorne wrote.
Dark pools are private off-exchange trading venues used by institutional investors to move large positions with minimal price disruption. The way it works means there is always a buyer on the other side. This trade may reflect a portfolio rebalancing, a hedge position, an options-related trade, or a straight liquidation.
IBIT rose on the day despite the size of sell-side printing, closing slightly higher at $42.99. Bitcoin remained close to $75,900 during the session, with no significant trading disruptions. Tuesday at 7pm ET; $BTC It is changing hands at $75,600 per coin.
Market participants noted that dark pool transactions of this size often represent the transfer of holdings by one institution to another, with the ultimate impact on ETF assets under management revealed only through next-day flow data. Flows reported on Wednesday are expected to confirm whether Tuesday’s trade will be recorded as a major outflow event.
At the same time the block passed, institutional option flows showed nearly $1 million flowing into December 2026 IBIT call options with a $45 strike price. This position suggests that at least some large market participants remain bullish on Bitcoin until the end of 2026, even though the block trades have generated speculation of capital outflows.
Traders on social platforms like X said the U.S. Spot Bitcoin ETF could see record daily outflows if trades reflect net selling. Since its founding in January 2024, IBIT has amassed tens of billions of dollars in assets and has become the primary vehicle for institutional investors’ Bitcoin exposure in the United States.
Mr. Balciunas and Mr. Seifert have closely tracked IBIT’s trading volume since the fund’s inception, and they note the fund’s increasing ability to absorb large institutional trades without causing price volatility.
The fact that Bitcoin remained above $75,000 and IBIT closed in positive territory after an issuance of $1.29 billion reflects how much the fund’s liquidity profile has developed over the past two years.
The question of whether Tuesday’s trades represent a distribution event or a shift between institutional counterparties will likely be answered when official ETF flow data is released on Wednesday.
