| 1.0.0 | 05/17/16 | Initial version 1.0.0. |
| 1.0.1 | 05/31/16 | Added Ips and Port Numbers to the EDGX Options Certification Address/Unit Distribution table. |
| 1.0.2 | 06/28/16 |
- Added Ips and Port Numbers to the EDGX Options Production Address/Unit Distribution table.
- Updated the
Sequenced Unit Header to 8 bytes. - Removal of NBBO Price from Auction Notification message.
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| 1.0.3 | 08/01/16 | Added support for BAM Auctions. |
| 1.0.4 | 01/06/17 | Updated description of Auction Trade message. |
| 1.0.5 | 10/17/17 | Cboe branding/logo changes. |
| 1.0.6 | 03/08/18 | Updated Unit Distribution ranges. |
| 1.0.7 | 03/23/18 | Updated Unit Distribution ranges effective date updated to 4/14/18. |
| 1.0.8 | 6/28/2018 |
- Added Multicast Options Auction Feed Descriptions table.
- Added Feed Connectivity Requirements section.
- Added feed shaping information to source network headers.
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| 1.1.0 | 11/16/18 | Added support for C1 Options Feed. |
| 1.1.1 | 12/06/18 | Added notes indicating Feature Pack 4 updates. |
| 1.1.2 | 03/07/19 |
- Added matching engine unit 33 information in support of XSP trading on EDGX Options effective 04/08/19.
- Added C1 certification primary data center rendezvous point IP address, unit distribution, and C1 Certification symbol ranges.
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| 1.1.3 | 04/05/19 | Correction to EDGX Options Gig Shaped EAA, EBA and EEA Feeds for Unit 33 |
| 1.1.4 | 04/15/19 | Added Production IP addresses for C1 Options. |
| 1.1.5 | 05/01/19 | Added notes indicating Options Auction Update, Auction Summary, and Width Update messages will be disseminated for EDGX options, effective with C1 Feature Pack 7. |
| 1.1.6 | 05/14/19 |
- Corrected description of Width Update message to indicate that message is only sent in the event that baseline MCW and OCW values are modified from their original state.
- Updated Options Auction Update message with Opening Condition = C (Crossed Composite Market), and addition Composite Market Bid and Offer price fields. Added SOQ Strike Range Update message. Update 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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| 1.1.7 | 05/20/19 | Added Constituent Symbol Mapping message with example. |
| 1.1.8 | 06/12/19 | Corrected certification and production C1 symbol range for units 9 and 20. |
| 1.1.9 | 07/12/19 | Updated Symbol Mapping mapping description to indicate that full list of symbols should be received in approximately 30 minutes. |
| 1.1.10 | 7/25/19 | Added notes indicating Options Auction Update message Opening Condition values ‘B’ and ‘S’ are only applicable to the Cboe Options Exchange ("C1"). |
| 1.1.11 | 9/18/19 | Corrected Symbol Mapping Message and Constituent Symbol Mapping examples. |
| 1.1.12 | 1/31/20 |
- Corrected UKXM and QQQ symbol entries in Unit Distribution table.
- Clarified description of Time message.
- Updated SAM effective date for EDGX to 2/3/20.
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| 1.1.13 | 8/27/20 | Added SPESG to the Unit Symbol Distribution tables for C1 unit 31 (effective 09/21/20). |
| 1.1.14 | 10/06/20 | Added SPESG to the Unit Symbol Distribution table Exclusion entries for C1. |
| 1.1.15 | 10/20/20 | Removed XSP from the Unit Symbol Distribution tables on EDGX (effective 11/2/20). |
| 1.1.16 | 01/22/21 | Updated Price field description on Auction Notification message to indicate that for SPX and SPXW AIM, this field will reflect the auction price (C1 Only) (effective 02/22/21). |
| 1.1.17 | 02/01/21 |
- Added MRUT to the Unit/Product Distribution tables for C1 unit 31 (effective 3/01/21).
- Added new updated Unit/Product Distribution tables with harmonized symbol ranges (effective 3/22/21).
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| 1.1.18 | 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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| 1.1.19 | 05/13/21 | Updated Curb session effective date to TBD 09/27/21. |
| 1.1.20 | 08/25/21 | Updated Curb session effective date to TBD. |
| 1.1.21 | 09/09/21 | Updated description of Auction Type field on Options Auction Update and Auction Summary messages (effective TBD). |
| 1.1.22 | 09/30/21 |
- Updated effective date for new Time Reference message (C1 Only), EpochTime field to Time message (C1 Only), and Binary Date field type to Section 2.2 - Data Types to 10/10/21.
- Added new section 1.1 - '24x5 Feed Hours and System Restart (C1 Only)' (effective 10/10/21).
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| 1.1.23 | 11/04/21 |
- Corrected example Time message values.
- Removed note indicating Auction Type = O will be sent prior to Curb session. This value will only be sent for the RTH Opening.
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| 1.1.24 | 02/02/22 | Added NANOS to the C1 unit 32 Unit/Product Distribution tables (effective 03/14/22). |
| 1.1.25 | 03/01/22 | Removed XSP from the BZX unit 31 Unit/Product Distribution tables. |
| 1.1.26 | 11/07/22 | Moved XSP to the C1 unit 32 Unit/Production Distribution tables (effective 12/04/22). |
| 1.1.27 | 03/30/23 | Clarified RUT is on BZX and C2 Unit 31. |
| 1.1.28 | 08/21/23 | Updated Price in AIM Auction Notification messages. |
| 1.1.29 | 01/29/24 | Added MXACW, MXUSA, and MXWLD to the C1 unit 31 Unit/Product Distribution tables (effective 03/18/24). |
| 1.1.30 | 11/22/24 | Added CBTX, CBTXW, MBTX, and MBTXW to the C1 unit 31 Unit/Product Distribution tables (effective 12/02/24). |
| 1.1.31 | 12/13/24 | Added new Unit/Product Distribution for Units 1-30 (effective 03/31/25). |
| 1.1.32 | 01/15/25 | Updated with Cboe Titanium branding. |
| 1.1.33 | 03/25/25 | Added SPEQX to C1 unit 31 unit/product distribution (effective 04/14/25). |
| 1.1.34 | 07/08/25 | Added Time Offset data type. Effective 09/08/25, Time Offset fields will be populated to nanosecond precision. |
| 1.1.35 | 10/20/25 | Added MGTN and MGTNW to unit 31 in US Options Unit/Product Distribution and excluded MGTN and MGTNW from unit 14 (effective 12/08/25 TBD 11/17/25). |
| 1.1.36 | 11/06/25 | Updated MGTN and MGTNW effective dates to TBD. |
| 1.1.37 | 11/18/25 | Updated MGTN and MGTNW effective dates to 12/08/25. |
| 1.1.38 | 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). |
| 1.1.39 | 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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| 1.1.40 | 05/14/26 |
- Updated XSPBW effective date to 06/15/26.
- Updated U.S. Options Unit/Product Distribution to include DJXW (effective 05/18/26).
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| 1.1.41 | 07/21/26 | Removed VIX and VIXW exclusion from unit 23 and added VIX and VIXW exclusion to unit 24 U.S. Options Unit/Product Distribution tables. |
