Someone Just Sold $1.29 Billion of BlackRock’s Bitcoin ETF in a Single Dark-Pool Trade

By Isaac • May 27, 2026 4:46 pm •

An unknown investor sold $1.29 billion worth of BlackRock’s iShares Bitcoin Trust in a single dark-pool block trade on Tuesday morning. The 29.2 million-share sale was the biggest IBIT block trade Galaxy Digital head of research Alex Thorn said he had seen.

The trade hit at 10:30 a.m. ET while U.S. spot Bitcoin ETFs were already deep in a week-long outflow streak.

massive $1.289 billion IBIT block sale by unknown party through dark pool at 10:30am today, biggest such trade i’ve ever seen pic.twitter.com/9qGDqkfCbu

— Alex Thorn (@intangiblecoins) May 26, 2026

A dark pool is a private exchange where large institutional trades execute away from the public order book. The purpose is to avoid moving