Bitcoin’s price briefly dropped to nearly $75,000 earlier, representing an intraday decline of roughly 2%. The move happened quickly, drawing attention from traders and analysts.
Observers have started debating the cause of the sudden sell-off, with many pointing to activity tied to BlackRock’s spot Bitcoin ETF, IBIT.
Massive Dark Pool Block Trade in BlackRock’s IBIT ETF
Several analysts flagged a very large IBIT block sale—reported at $1.289 billion—executed by an unidentified counterparty through a dark pool at 10:30 AM yesterday.
Well-known ETF analyst Eric Balchunas highlighted that the trade involved approximately 29 million shares, a size that dwarfed other trades that day and may be among the largest single-block trades observed.
Confirmed.. 29 million share trade ($1.3b) of $IBIT executed at 1030am this morning. This screen shows all the IBIT trades today by size and you can see one of these is not like the others. Price unchanged today so mkt absorbed it well. https://t.co/Otew0DWa3F pic.twitter.com/jZcoKez74K
— Eric Balchunas (@EricBalchunas) May 26, 2026
Market participants are now speculating that this transaction may have contributed to one of the largest single-day outflows from a Bitcoin ETF. Traders noted the timing of the block trade lined up with a sudden downward move in BTC visible on price charts.
The incident underscores the risks associated with concentrated liquidity—especially as major institutional players increase their involvement in crypto markets and as large corporate treasuries hold significant Bitcoin positions. When large orders are executed through off-exchange venues like dark pools, they can create abrupt imbalances that translate into rapid price movements in the underlying asset.
While the market appeared to absorb the trade without an immediate, sustained shift in IBIT’s quoted price, the episode has renewed discussion about transparency, market structure, and the potential for concentrated flows to amplify volatility in spot Bitcoin and related ETF markets.
Analysts and traders will be watching subsequent trading sessions for signs of continued outflows or further large block trades. Increased scrutiny of dark-pool activity and block trades in major ETFs may follow, as market participants seek better signals to judge liquidity and tail-risk exposure in an increasingly institutionalized crypto ecosystem.