Blackrock IBIT Dark Pool Trade Tops $1.29 Billion as Bitcoin Stays Flat Above $75,000

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A $1.29 billion dark pool block trade in Blackrock’s Ishares Bitcoin Trust (IBIT) crossed Nasdaq on Tuesday morning, drawing immediate attention from institutional traders and crypto analysts tracking exchange-traded fund (ETF) flows. Blackrock IBIT Dark Pool Trade Tops $1.29 Billion as Bitcoin Stays Flat Above $75,000 Key Takeaways - Blackrock’s IBIT saw a $1.29B dark pool block trade on May 26, 2026, the largest single institutional bitcoin ETF print on record. - Galaxy Research’s Alex Thorn estimated the trade equaled roughly 16,400 BTC, yet IBIT closed up slightly at $42.99. - Wednesday ETF flow data will confirm whether the trade triggers record single-day bitcoin ETF outflows or reflects simple rebalancing. As of publication, the stats have not been released. Blackrock Bitcoin ETF Sees Largest Institutional Block Trade According to several reports, the order was executed around 10:30 a.m. ET at approximately $43.16 per share, covering roughly 29 million shares. Bloomberg ETF analysts Eric Balchunas and James Seyffart confirmed the transaction as an intermarket sweep order. The single candle generated on IBIT’s chart surpassed the fund’s typical full-day trading volume. Galaxy Research’s Alex Thorn stated it was the largest IBIT block trade he had seen. “Massive $1.289 billion IBIT block sale by unknown party through dark pool at 10:30 am today, biggest such trade I’ve ever seen,” Thorn wrote. Dark pools are private, off-exchange trading venues used by institutional players to move large positions with minimal price disruption. The mechanics mean there is always a buyer on the other side. The trade could reflect a portfolio rebalancing, a hedging position, an options-related transaction, or a straight liquidation. IBIT closed slightly higher on the day at $42.99, rising despite the scale of the sell-side print. Bitcoin held near $75,900 during the session, showing no significant disruption tied to the trade. At 7 p.m. ET on Tuesday, BTC is changing hands for $75,600 per coin. Market observers noted that dark pool transactions of this size often represent one institution shifting holdings to another, with the net effect on ETF assets under management only becoming clear through next-day flow data. Wednesday’s reported flows are expected to confirm whether Tuesday’s trade registers as a major outflow event. At the same time the block crossed, institutional options flow showed nearly $1 million moving into December 2026 IBIT call options at a $45 strike. That positioning suggests at least some large market participants remain bullish on bitcoin through the end of 2026, even as the block trade generated outflow speculation. Traders on social platforms like X pointed to a possible record single-day outflow for U.S. spot bitcoin ETFs if the transaction reflects net selling. IBIT has accumulated tens of billions in assets since launching in January 2024 and has become a primary vehicle for institutional bitcoin exposure in the United States. Balchunas and Seyffart have tracked IBIT volume closely since the fund’s debut and have both noted the fund’s growing ability to absorb large institutional trades without triggering price dislocations. The fact that bitcoin stayed above $75,000 and IBIT closed in positive territory after a $1.29 billion print reflects how much the fund’s liquidity profile has developed over the past two years. Whether Tuesday’s trade represents a distribution event or a shift between institutional counterparties will likely be answered once the official ETF flow data posts on Wednesday.

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