An unknown party dumped $1.289 billion worth of BlackRock's spot Bitcoin ETF through a dark pool on Tuesday morning, knocking Bitcoin's price to nearly $75,000 and rattling a market already on edge about concentrated liquidity. The block trade, executed at 10:30 AM on May 26, involved 29 million shares of IBIT — a volume that dwarfed every other trade for the day, according to ETF analyst Eric Balchunas.
The block trade
The seller's identity remains unknown. The trade went through a dark pool — a private exchange where large orders can be placed without tipping off the broader market before execution. But the size of the sale, roughly $1.289 billion, was impossible to hide. Balchunas noted the 29 million shares represented more than all other IBIT trades combined on Tuesday. Rumors are already circulating that the outflow could set a new single-day record for a Bitcoin ETF, though official data hasn't confirmed that yet.
What traders saw
Charts show Bitcoin's price suddenly turning south just as the block trade went through. The day's decline was about 2%, which isn't catastrophic on its own. But the speed of the move and the sheer dollar amount behind it caught traders' attention. One minute the market was ticking along, the next a billion-dollar sell order had landed — in a single batch.
The event highlights a danger that's been lurking as big institutions and corporate treasuries pile into Bitcoin: concentrated liquidity risk. When one player holds a massive position — and decides to exit via a block trade — the ripple effects hit everyone else. Dark pools are supposed to soften the impact, but a trade this size still spills into the public market. With more than a dozen spot ETFs now trading and companies like MicroStrategy sitting on enormous Bitcoin treasuries, the market is increasingly vulnerable to single-point shocks. Tuesday's episode is a reminder that even a small percentage drop on a large block can move the underlying asset in ways retail traders may not expect.
The unanswered question: who sold, and why? Until that's known, the market will keep guessing whether this was a one-off liquidity event or a signal of something bigger.
