A single investor dumped 29.21 million shares of BlackRock's IBIT at a 2.3% discount on May 26, paying $29.5M in execution costs. NYDIG analysis rejects the basis-trade theory, citing no corresponding spike in CME futures volume. The position exceeded every disclosed IBIT holder in recent 13F filings.
A single investor dumped 29.21 million shares of BlackRock's IBIT at a 2.3% discount on May 26, paying $29.5M in execution costs. NYDIG analysis rejects the basis-trade theory, citing no corresponding spike in CME futures volume. The position exceeded every disclosed IBIT holder in recent 13F filings.
A massive block sale of 29.21 million shares of BlackRock's iShares Bitcoin Trust (IBIT) on May 26 — worth $1.26 billion — was likely a rapid exit by a single large investor, not an arbitrage unwind, according to a new analysis by NYDIG.
The trade was executed at $43.16 per share via the FINRA/Nasdaq TRF Carteret facility, a common venue for privately negotiated off-exchange transactions. The price represented a $1.01 discount to IBIT's market price at the time — a 2.3% concession worth approximately $29.5 million in execution costs.
NYDIG's global head of research, Greg Cipolaro, said the size of the discount suggests the seller prioritized certainty and speed over maximizing price. The firm rejected the theory that the block was tied to a bitcoin basis trade (where investors hold spot exposure while shorting futures), arguing that the discount would have significantly reduced the strategy's expected returns.
Critically, the IBIT position represented exposure equivalent to roughly 3,700 CME bitcoin futures contracts, yet only 91 contracts traded during the minute of execution — no unusual spike in futures volume.
The position exceeded the reported holdings of every disclosed IBIT investor in recent 13F filings, making identification difficult. The sale came as U.S. spot bitcoin ETFs recorded daily net outflows on every trading day from May 15 through May 29, with total category assets falling from $107.75 billion to $94.17 billion.
Bitcoin has fallen 16% year-to-date in 2026 while equities and commodities have surged, as capital continues to rotate out of crypto into AI and other sectors.
Key Takeaway: A single $1.26B IBIT exit at a 2.3% discount reveals that even the most liquid Bitcoin ETF carries real exit costs for large holders — and that not every outflow is mechanical arbitrage.
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