Massive Block Sale Raises Questions about Institutional Demand for Bitcoin ETFs

A significant block sale of BlackRock's iShares Bitcoin Trust (IBIT) has drawn attention to the liquidity and demand for bitcoin exchange-traded funds (ETFs). On May 26, 2026, a single trade worth $1.26 billion in IBIT shares was executed off-exchange at a notable discount to market price.

The sale represents one of the largest transactions in the short history of spot bitcoin ETFs and has sparked debate about the identity of the seller and their motivations. While some have suggested that the trade may be related to a basis trade, a strategy involving holding spot bitcoin or an ETF while simultaneously shorting futures contracts, analysis by crypto investment research firm NYDIG suggests that this explanation is unlikely.

The size of the concession in the sale, equivalent to $29.5 million, suggests that speed and certainty were prioritized over price optimization. This has led some to speculate that a large institutional investor was seeking to quickly exit their bitcoin exposure rather than wait for better prices.