Last week, an institutional investor executed the largest single off-exchange trade in the history of a U.S. Bitcoin spot-traded fund, draining a $1.26 billion position in BlackRock’s iShares Bitcoin Trust (IBIT).
The deal has sparked intense debate on Wall Street, but NYDIG’s analysis suggests the sale was a targeted emergency exit by the whale, rather than the routine conclusion of a popular hedge fund arbitrage trade.
Our analysis shows that companies paid a high price for instant liquidity. Approximately $30 million in execution costs were incurred just to secure an exit before the broader digital asset market fell into a notable downturn.
Understanding IBIT MegaTrade
NYDIG noted that BlackRock’s IBIT activity began to quietly accelerate after an early morning session at normal volumes.
According to the company, the ETF’s stock price slowly rose from $43.81 to an intraday high of $44.24 between 10:16 a.m. ET and 10:28 a.m. ET. Trading volumes during this period soared to three to four times normal levels, suggesting that executing brokers were testing market liquidity and carefully preparing for large orders.
Then, at exactly 10:30 a.m., the hammer fell.
A seller sold 29.21 million IBIT shares in a privately negotiated off-exchange transaction. The block cleared at $43.16 per share. The prevailing open market price at that moment was $44.17, so the seller accepted a 2.3% haircut on the spot. In dollar terms, that execution fine cost the mysterious entity approximately $29.5 million.
The regulatory reporting code accompanying the transaction indicates that the seller places a special emphasis on speed. This trade was output to the FINRA/Nasdaq TRF Cartelet. This cartelette is a facility used by broker-dealers to report dark pool and privately negotiated transactions.
In addition, we also received an intermarket sweep order designation along with a Reg NMS trade-through exemption.
In layman’s terms, these exemptions allow institutional investors to avoid the requirement to seek the absolute best listed price across multiple public exchanges, subject to the responsibility of meeting certain protected quotations.
This indicates that sellers actively chose the certainty of an immediate, uniform exit over the possibility of a better price.
Debunking the Arbitrage Myth
When extremely rare multi-billion dollar prints occur in crypto ETFs, market commentators typically default to the common explanation of basis trading.
This popular hedge fund strategy involves buying spot ETFs and shorting Bitcoin futures at the same time, earning yield from the price difference between the two.
However, NYDIG’s analysis identifies three distinct factors that dismantle the basis unwind theory in this case.
First, the basic economics do not agree. Basis traders rely on earning a narrow percentage of yield over time. Accepting an immediate 230 basis point loss on the spot leg of the trade immediately evaporates a large portion of the strategy’s expected annual return.
Unless faced with a catastrophic margin call, arbitrage desks passively liquidate positions naturally over days or weeks to preserve capital.
Second, the structural exigencies of trade are not entirely consistent with delta-neutral management. Intermarket sweep orders and high bulk discounts are characteristic of distressed or deeply convicted directional sellers rather than market-neutral yield farmers.
Finally, the futures market was the ultimate clincher. IBIT’s block of 29.21 million shares is worth approximately 18,500 Bitcoins. If arbitrageurs were to exit delta-neutral positions of this size, they would need to simultaneously buy back approximately 3,700 Chicago Mercantile Exchange (CME) Bitcoin futures contracts to even out the books.
But CME’s order book barely registered a pulse on the day. Only 91 futures contracts switched trades at the exact moment the ETF block crossed the tape. In the entire 30-minute window surrounding the deal, just 1,000 contracts were executed.
Moreover, a true basis unwind of this size would have required almost half of CME’s total daily trading volume to be absorbed instantly, which would have caused a large and highly visible spike in futures trading.
Therefore, the fact that no such spike existed at all confirms that sellers were simply long Bitcoin and suddenly wanted to sell Bitcoin.
Who is the whale?
Given the scale of the transaction, the list of suspects is surprisingly short.
NYDIG noted that block trades exceeded the total holdings of all disclosed 13F investors in the first quarter of 2026, excluding authorized participants and market makers who hold inventory solely for the purpose of providing liquidity and not for investment purposes.
After a deal of this size, analysts naturally look to the flow of funds to track the aftermath. IBIT recorded net redemptions of $192 million on May 26, followed by an additional $528 million in redemptions on May 27.
However, market mechanics suggest that these numbers do not represent direct and immediate settlement of whale stocks.
The ETF’s net asset value closed at $42.95 on the day of the trade and at $42.43 the following day, which was significantly lower than the negotiated block execution price of $43.16, and the counterparties who purchased the shares had no economic incentive to immediately redeem the shares with the issuer.
That way, your loss will be fixed immediately. Instead, the buyer may have absorbed the block into inventory and systematically distributed the shares to the secondary market over time.
Therefore, the ultimate identity of the seller and his motives remain hidden in the opacity of off-exchange trading. It is impossible to definitively prove whether the whales were driven out by strict internal risk limits or made discretionary bets that the crypto market was headed for a sustained downturn.
Market headwinds and institutional fatigue
After the May 26 trade, Bloomberg ETF analyst Eric Balciunas argued that “the market has absorbed the sell-off well.”
However, the timing of the $1 billion exit turned out to be aggressive, as May was a painful month for digital assets. The top cryptocurrency fell nearly 4% over the month, ending up trading at nearly $73,000, according to data from CoinGlass.
This price performance was exacerbated by a collapse in investor appetite for spot Bitcoin ETFs.
NYDIG noted that US funds that participated in the May 26 trade have already suffered six consecutive days of outflows. The sector suffered $1.55 billion in outflows during this period alone, with BlackRock’s IBIT bearing the brunt of the damage, losing about $1.1 billion.
By the end of May, the damage had spread further. U.S.-listed spot Bitcoin ETFs recorded total monthly outflows of $2.4 billion, according to data from SoSoValue.
Due to sustained selling pressure, total assets under management across the ETF category fell from more than $100 billion to $94.17 billion.
(Tag translation) Bitcoin
