Bitcoin exposure looks simple until the instruments are compared side by side. A May 2026 paper on arXiv estimated the implied carry embedded in listed IBIT options and compared it with matched CME bitcoin futures. Its core finding was a persistent wedge: the ETF-options market and the futures market can imply different financing terms even though both reference bitcoin exposure.
The paper’s selected-strike sample found a mean wedge of 2.58 percentage points and a median wedge of 2.52 percentage points in annualized terms. The interpretation is not that one market is wrong every day. It is that collateral, margin, borrow, creation-redemption and cross-margin limits can prevent arbitrage from closing the gap cleanly.
IBIT’s own product page shows why the wrapper is different from holding bitcoin directly: the trust trades on Nasdaq, uses the CME CF Bitcoin Reference Rate – New York Variant as its benchmark, charges a sponsor fee, and warns that shares trade at market price rather than being individually redeemable by ordinary investors. CME, meanwhile, emphasizes regulated bitcoin futures, options and reference-rate-based price discovery.
For traders, the lesson is practical. A hedge built with IBIT options, spot bitcoin, CME futures or perpetual swaps may not behave identically during stress. Carry, margin calls and liquidity windows can dominate the trade even when the directional bitcoin view is correct.
Sources: arXiv paper on implied ETF carry rates; iShares IBIT product page; CME Bitcoin futures overview.
Risk notice: Basis and carry trades are complex. Financing, margin and liquidity risks can turn a theoretically hedged trade into a real loss.
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