Since the approval of spot Bitcoin ETFs in the United States and subsequently their options, it was expected that regulated Bitcoin exposure markets would converge toward a single efficient financing price. Empirical reality, however, shows otherwise.
A recent analysis of 386 daily observations between IBIT (iShares Bitcoin Trust) options and CME futures reveals a persistent annualized carry gap of approximately 2.6 percentage points.
This spread is not transitory noise nor a simple arbitrage opportunity. In our view, it is the clearest signature of structural segmentation that no 24/7 trading clock will be able to eliminate on its own.
To understand the magnitude of the phenomenon, it is worth recalling how this gap is calculated. On the IBIT side, put-call parity on ETF options is used to extract an implied forward price, which is then converted into Bitcoin terms via the creation/redemption basket ratio (22.66 BTC per creation unit).
On the CME side, the futures price is directly the forward. Both are annualized and compared against a reference spot price. If both markets were fungible, the two financing charges should be statistically indistinguishable. They are not. The gap mean is 2.58% and the median 2.52%, with a consistency that suggests a systemic, not random, factor.
The answer lies not in Bitcoin’s intrinsic volatility, but in the rules of each regulatory jurisdiction. IBIT options operate under the SEC and OCC (Options Clearing Corporation), which imposes ETF creation/redemption windows, prime broker lending restrictions, and the need to collateralize with ETF shares themselves.
CME futures, in contrast, operate under the CFTC, with cash or Treasury margins, cash settlement based on the BRRNY index, and a different clearinghouse. There is no direct, frictionless mechanism to exchange exposure between the two systems without incurring capital costs, asymmetric settlement times, and segregated collateral.
This segmentation has historically been aggravated by trading hours. Until very recently, CME futures traded only on weekdays, leaving weekends uncovered for carry positions. The introduction of 24/7 trading on CME as of May 29, 2026, eliminates that specific component. However, in our opinion, the basis gap will not disappear as a result. The weekend component was only one among several; asymmetric financing costs between ETF collateral and cash collateral will continue to operate.
An even more relevant element is liquidity concentration. Open interest in IBIT options is approximately $27-30 billion, while CME Bitcoin futures options open interest is only about $0.8-0.9 billion. That 30x difference means large institutional flows move prices in one venue without immediate replication in the other. Consequently, the carry on the IBIT side can diverge from the CME carry for extended periods, without a clean arbitrageur emerging to exploit the difference.
From a market perspective, this gap has concrete implications. For market makers and arbitrage funds, it represents an opportunity cost: if collateral segmentation could be bypassed, a positive basis trade (buy the cheaper asset in the financing market and sell the more expensive one) would exist. But operational reality imposes that any arbitrage attempt must face separate margins, lack of cross-margining agreements between OCC and CME, and regulatory restrictions on maintaining short ETF positions or long futures positions depending on jurisdiction. This is not a pricing inefficiency, but an institutional barrier.
Recently, options on the Nasdaq QBTC index have been proposed, which would be cash-settled and could receive regulatory relief from the CFTC. If these options capture liquidity, they could compete directly with IBIT options. In that scenario, the gap could compress, but we do not believe it will disappear entirely. More likely, a new spread level will establish itself, reflecting liquidity costs and margin requirements between the new product and CME futures.
The 2.6% gap between IBIT and CME is not a pricing error or a short-lived arbitrage opportunity. It is a symptom that the regulated financial system for crypto assets remains a collection of silos, not a unified market.
The solution will not come solely from extending trading hours, but from harmonizing collateral rules, enabling cross-margining between ETF derivatives and futures, and recognizing that true integration between the SEC and CFTC remains work in progress. Until then, market participants should read this gap not as a directional signal for Bitcoin’s price, but as a map of the frictions that still limit the efficiency of our most liquid markets.
