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A User Defined Spread (UDS) is a multi-legged instrument created by a client for trading on the CME Globex platform. The user submits a request proposing the attributes of the spread (e.g. legs, leg ratio, leg option delta, etc.) and CME Globex processes the request. If accepted, CME Globex disseminates the tradable instrument to the market.

This page provides an overview of UDS topics.

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Table of Contents

For more detailed information on UDS messaging, validation, and processing, please refer to these topics:

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Since UDS instruments are user-defined and initially created from available outright instruments, a variety of spreads and combinations can be created and are classified according to their component instruments as described below.

  • UDS Combo - a UDS of option outrights; may be an exchange-recognized or generic spread type.

  • Exchange Recognized UDS - Spread structure matches that of a standard CME Globex spread type. For example, an options spread having the structure of a Butterfly (buy1 sell2 buy1) will be disseminated as such.

Info

The following exchange-recognized UDS types are supported for Futures UDS:

Note: per destination UDS group, either SA or FS will be supported as an exchange-recognized spread type. No single group will support both SA and FS.

  • Unrecognized UDS - Spread structure does not match the construction of any standard CME Globex spread type, disseminated as a Generic (GN) spread type.

  • Recursive UDS - Spread having at least 1 leg that is a UDS. Only one level of recursion is allowed. UDS instruments constructed recursively can contain up to a maximum of 40 total outright instruments.

Info

For Futures UDS:

  • All legs must be an exchange-recognized Strip UDS (SB, WS, XS, SA or FS)

  • The recursive spread must be an exchange-recognized Strip UDS (SB, WS, XS, SA or FS).

  • Covered UDS - Spread created by combining an outright option or options spread with up to 39 outright futures instruments, for a maximum of 40 instruments. Exchange-recognized spread types and unrecognized UDS can be used to construct a Covered spread, which is disseminated as a Covered (CV) spread type. A Covered spread is designed to be delta-neutral.

Refer to User Defined Spread Types and Characteristics for complete details on the UDS types described above.

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Futures UDS have the following constraints:

  • UDS futures are only supported for:

    • TL spreads in CBOT treasury futures (ZT, Z3, ZF, ZN, ZU, ZB)

    • GN, SB, WS, XS, SA, FS and SP spreads in Market Segments (tag 1300-MarketSegmentID) 78 and 80

  • Futures UDS cannot be implied.

UDS Terminology

UDS messaging relies on message tag groups, i.e., each instrument included in the UDS creation request is defined in a block of message values, which is repeated within the message for each component instrument.

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If a UDS is created in a non-open group state:

  • the RFQ will not be auto-generated—clients must submit the RFQ when the destination group state returns to Open.

  • the implied book will not be generated; the implied book will be auto-generated at market Open.

UDS Composition

CME Globex allows a User Defined Spread (UDS) to be composed of instruments from multiple related security groups; the resulting UDS instrument then belongs to the UDS security group (U$) as indicated in tag 1151-Security Group in the market data Security Definition message. For example, instruments from the following security groups may be used in a single UDS:

  1. S0

  2. S2

  3. S3

The resulting UDS will belong to the security group U$, which contains all User Defined Spreads for SOFR Options.

The following are examples of SOFR options combinations allowed within a UDS and which would belong to security group U$:

  1. Buying one option from security group J1 and selling another option from security group J1

  2. Buying one option from security group J2 and selling another option from security group J2

  3. Buying one option from security group J2 and selling another option from security group J2

  4. Buying one option from security group J1 and selling another option from security group J3

  5. Buying one option from security group J3 and selling another option from security group J2

  6. Buying one option from security group J1 and selling another option from security group J2

  7. Buying one option from security group J1, buying one option from security group J2, and buying one option from security group J2

UDS Recursion

A UDS can be constructed from available outrights or a combination of outrights and existing UDS instruments.

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A UDS constructed from available outrights can be used as a building block in another UDSby means of recursion, or the process of creating a UDS which contains another UDS. CME Globex allows only one level of recursion. A recursive UDS can contain a maximum of 40 outright instruments, such that, when the UDS instrument is decomposed, all component instruments do not exceed 40.

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nameUDS Recursion Levels
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UDS Life Cycle

  • A covered UDS expires at the end of the trading session in which it has been created.

  • All other UDS instruments expire and are extended according to UDS Expiration and Extension rules.