Adjusted Interest Rate (AIR)
Total Return futures

Total return equity index exposure, now enhanced with a floating rate.
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Get ready to float this fall

New Adjusted Interest Rate (AIR) Total Return futures on the S&P 500 Index are designed to give you total return exposure with an overnight floating rate built in. The enhanced contract design provides similar economics to an equity index total return swap with the margin efficiency of listed futures.

Key benefits

Capital-efficient total return equity index swap exposure with a low initial margin and curtailed dividend risk.

Trading convention reminiscent of the OTC TRS market through use of Basis Trade at Index Close (BTIC) transactions.

Cross margining with standard and E-mini S&P 500 futures and options and other benchmark CME Group Equity Index products.

Expands your trading flexibility with choice of vanilla and new AIR Total Return futures contracts.

Understanding AIR Total Return S&P 500 futures

Watch our video series to find out more about the unique features of this contract and view trade examples.

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    How AIR Total Return futures work

    Here is the basic premise behind the contract. AIR Total Return futures (TRF) have a known maturity date, and its valuation will be based on three key components: the underlying equity index, accrued financing rate, and a financing spread adjustment that follow this basic formula:   

    • Equity index value – will always be the official index daily close represented in an E-mini S&P 500 BTIC transaction
    • Accrued financing – represents the sum of the daily accrued financing from the product’s listing date, accrued daily based upon the benchmark reference rate (EFFR).

    The sum is incorporated into the daily settlement of the product and netted with the equity index performance as shown above – giving the AIR TRF buyer the index exposure minus the sum of the accrued daily financing to date.

    • Financing spread adjustment – represents the amount the counterparties will agree to lock into a spread +/- to the reference rate (TRF spread) for the remaining time to maturity. 

    The spread rate will be determined primarily by the rebate value the market ascribes to the value of the underlying index’s stocks. Thus, the TRF spread is equivalent to the spread that would be charged above or below the benchmark reference rate in an equity index swap.

    Find a detailed methodology of the contract in the resources section below.

    Resources and tools

    Adjusted Interest Rate Total Return Futures: Explained

    Get a detailed description of how the AIR TRF contracts works: the mechanics, the cash flows, use case examples, and more.

    Fact card

    View a summary and preliminary contract specifications that you can download, share, and print.

    Total Return Index futures at CME Group

    Explore the full suite of Total Return Index futures you can trade from the CME Group Equity Index product line-up.

    About BTIC and BTIC+ trading

    Learn about Basis Trade at Index Close (BTIC) transactions available at CME Group.


    Get answers to frequently asked questions about Adjusted Interest Rate (AIR) Total Return futures, including product details and trading hours.

    FTP Directory

    Review the daily inputs required to trade the product, such as Accrued Financing and days to maturity. View the layout for the AIR futures datafiles.

    Take a breath of AIR: Get to know AIR Total Return futures

    View our whitepaper to get an understanding of AIR Total Return futures, including a detailed explanation of contract valuation, specifications, and use cases.­

    Use the QuikStrike calculator to compute the AIR Total Return futures price

    Contract Specifications

    Contract unit

    $25 x AIR S&P 500 Total Return Index Price

    Underlying index

    S&P 500 Total Return Index (SPTR)

    Reference rate

    Effective Fed Funds Rate (EFFR)

    Trading quotation

    TRF spread in basis points expressed as an annualized number.

    Trading hours

    CME Globex: BTIC: Sunday - Friday 6:00 p.m. - 4:00 p.m. Eastern Time (ET)

    CME ClearPort: BTIC Sunday 5:00 p.m. - Friday 5:45 p.m. (no reporting Monday – Thursday 5:45 p.m. – 6:00 p.m. CT)

    Minimum price fluctuation

    0.5 basis points in terms of the TRF spread.
    The resultant cleared AIR TRF futures price will be rounded to two decimals.

    Listed contracts

    Quarterly contracts listed for 13 quarters and 4 additional December contract months.

    Settlement method

    Financially settled.

    Termination of trading

    Trading terminates on the 3rd Friday of the contract month.
    BTIC: Trading terminates on the business day prior to 3rd Friday of the contract month.

    Settlement procedures

    Daily settlement price of contract shall be determined based on the following formula:

    = (SPTRt - AFt)+SPTR× τt× stsettle

    where the Spread Settle (stsettle) for the day shall be determined based on market activities (quotes, traded price) or prior day settle if no market activities, and AFt is the sum of accrued daily overnight financing until settlement.

     Final settlement price shall be determined based on the following formula:


    Block minimum


    View full contract specs

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