| 1.0.0 | 11/16/18 | Initial version 1.0.0. |
| 1.0.1 | 02/14/19 |
- Removed
Trading Status from Message Types as it was included in error. - Added certification IP addresses and unit distribution information.
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| 1.0.2 | 03/05/19 | Updated narrative description and field descriptions for Options Auction Update message. |
| 1.0.3 | 04/15/19 | Added Production IP addresses for C1 Options. |
| 1.0.4 | 05/08/19 | Corrected C1 Production IP addresses for Primary WAN Shaped [CCO] and [CDO] source network IP addresses. |
| 1.0.5 | 05/14/19 |
- Updated Options Auction Update message with Opening Condition = C (Crossed Composite Market), and added Composite Market Bid Price and Composite Market Offer Price fields.
- Added new SOQ Strike Range Update message.
- Updated example for Options Auction Update and added example for SOQ Strike Range messages.
- Added additional proprietary products to matching unit 31 in C1.
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| 1.0.6 | 05/20/19 | Added Constituent Symbol Mapping message with example. |
| 1.0.7 | 09/25/19 | Updated OSI Symbol example values in Symbol Mapping and Constituent Symbol Mapping message type examples. |
| 1.0.8 | 02/01/21 |
- Corrected QQQ, UKXM, and SPESG symbol exclusion entries in Unit Distribution table. Added SPESG to the symbol range entries in Unit Distribution table.
- Added MRUT to Unit/Symbol Distribution table (effective 03/01/21).
- Added new updated Unit/Symbol Distribution tables with harmonized symbol ranges (effective 03/22/21).
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| 1.0.9 | 03/25/21 |
- Added Binary Date field type to Section 2.2 - Data Types (effective 10/10/21 TBD 09/27/21 Q3 2021).
- Added new Time Reference message (effective 10/10/21 TBD 09/27/21 Q3 2021).
- Added EpochTime field to Time message (effective 10/10/21 TBD 09/27/21 Q3 2021).
- Updated description of Auction Type field on Options Auction Update and Auction Summary messages (effective TBD 09/27/21 Q3 2021).
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| 1.0.10 | 05/13/21 | Updated Curb session related effective date to TBD 09/27/21. |
| 1.0.11 | 06/15/21 | Updated extended GTH session effective date to 11/21/21. |
| 1.0.12 | 08/25/21 | Updated Curb session effective date to TBD. |
| 1.0.13 | 09/09/21 | Updated description of Auction Type field on Options Auction Update and Auction Summary messages (effective TBD). |
| 1.0.14 | 09/30/21 |
- Updated effective date for new Time Reference message, EpochTime field on Time message, and Binary Date field type to Section 2.2 - Data Types to 10/10/21.
- Added new section 1.2 - '24x5 Feed Hours and System Restart ' (effective 10/10/21).
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| 1.0.15 | 11/4/21 | Removed note indicating AuctionType value O will be sent prior to Curb session. This value will only be sent for the RTH Opening. |
| 1.0.16 | 12/9/21 | Updated hyperlinks to technical specifications. |
| 1.0.17 | 02/02/22 | Added NANOS to the C1 unit 32 Unit/Product Distribution tables (effective 03/14/22). |
| 1.0.18 | 11/07/22 | Moved XSP to the C1 unit 32 Unit/Production Distribution tables (effective 12/04/22). |
| 1.0.19 | 03/30/23 | Removed past effective dates. |
| 1.0.20 | 01/29/24 | Added MXACW, MXUSA, and MXWLD to the C1 unit 31 Unit/Product Distribution tables (effective 03/18/24). |
| 1.0.21 | 11/22/24 | Added CBTX, CBTXW, MBTX, and MBTXW to the C1 unit 31 Unit/Product Distribution tables (effective 12/02/24). |
| 1.0.22 | 12/13/24 | Added new Unit/Product Distribution for Units 1-30 (effective 03/31/25). |
| 1.0.23 | 01/15/25 | Updated with Cboe Titanium branding. |
| 1.0.24 | 03/25/25 | Added SPEQX to C1 unit 31 unit/product distribution (effective 04/14/25). |
| 1.0.25 | 07/08/25 | Added Time Offset data type. Effective 09/08/25, Time Offset fields will be populated to nanosecond precision. |
| 1.0.26 | 10/20/25 | Added MGTN and MGTNW to unit 31 in C1 Unit/Product Distribution and excluded MGTN and MGTNW from unit 14 (effective 12/08/25 TBD 11/17/25). |
| 1.0.27 | 11/06/25 | Updated MGTN and MGTNW effective date to TBD.
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| 1.0.28 | 11/18/25 | Updated MGTN and MGTNW effective dates to 12/08/25. |
| 1.0.29 | 01/12/26 | Updated 24x5 Feed Hours and System Restart to document the new time at which persisted orders are added back into the order book (effective 02/02/26). |
| 1.0.30 | 04/01/26 |
- Removed references to MXEA, MXEF, MXACW, MXUSA, and MXWLD.
- Updated Time description in Time and Time Reference messages.
- Added XSPBW to C1 unit 32 Unit/Product Distribution tables (effective 06/15/26 06/01/26).
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| 1.0.31 | 05/14/26 |
- Updated XSPBW effective date to 06/15/26.
- Updated C1 Unit/Product Distribution to include DJXW (effective 05/18/26).
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| 1.0.32 | 07/27/26 | Removed VIX and VIXW exclusion from unit 23 and added VIX and VIXW exclusion to unit 24 C1 Unit/Product Distribution tables. |
