| 2.0.0 | 11/16/18 | Version 1.x retired in favor of new format and to include support for Cboe Options Exchange. |
| 2.0.1 | 01/22/19 | Updated presentation of Maximum Composite Width and Opening Collar Width to include values vs. reference price tables and specific value in-effect for Volatility Openings. Added examples of calculation of collared opening prices. Added detail for post-cutoff time order type constraints for Volatility Openings. |
| 2.0.2 | 01/30/19 | Added VMIM algorithm examples showing the imbalance sign based price selection in both uncollared and collared scenarios. Moved numerical VMIM examples to an Appendix. |
| 2.0.3 | 04/16/19 | Updated to reflect early stop of the GTH session. Updated to reflect use of Appointed Market Maker Quotes in the determination of the Composite Market. Updated Volatility Opening section to reflect Settlement Liquidity order type design. |
| 2.0.4 | 05/02/19 | - Price Forming Opening Process will be used on C2 and EDGX effective with C1 Feature Pack 7.
- Updates to descriptions of Maximum Width Checks and Opening Collars to harmonize with Feature Pack 7 notice.
- Added Risk Limits section to Price Forming Opening Process.
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| 2.0.5 | 05/14/19 | - Added section defining the Composite Market for all options categories.
- Opening Information Dissemination updated to reflect Opening Condition = C (Crossed Composite Market) and two additional fields: Composite Market Bid Price and Composite Market Offer Price.
- Clarified that SLOO orders slide in both directions with movements in the midpoint of the Composite Market but will never work more aggressive than the original SLOO limit price.
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| 2.0.6 | 05/20/19 | Added specification of data feed and web/file-based access to constituent series identification on Volatility Settlement dates. Added specification of three methods to access Expected Opening Information for constituent series during the RTH pre-open on Volatility Settlement dates; data feed, website and public JSON endpoint. Added description of SOQ Strike Range specification and methods for accessing SOQ Strike Range information. Added additional specification of SLOO orders including sliding behavior, working price rounding and FIX/BOE restatements. Updated MCW and OCW tables for Volatility Opening. |
| 2.0.7 | 06/06/19 | Updated description of SOQ Strike Range dissemination. EOI information JSON interface specification update. |
| 2.0.8 | 06/21/19 | Modified the specification of the restatement reason codes provided in FIX and BOE restatements received when pegged SLOO order is repriced. Updated the Price Forming Opening Process Opening Trigger for Multi-list to observation of the first underlying round-lot print from the primary exchange. |
| 2.0.9 | 07/09/19 | Updated notes to indicate Price Forming Opening Process is now implemented on EDGX and C2 Options. |
| 2.0.10 | 08/09/19 | - Clarification added to Maximum Width Check indicating a series will not open when the Composite Market is crossed.
- Constituent Series for Volatility Openings are not eligible to reopen in any circumstances when MCW check fails.
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| 2.0.11 | 08/14/19 | - Added clarifying note regarding start of auction update dissemination for RTH opening of complex instruments on classes with GTH.
- Mass cancelations and purge requests are not honored on Constituent Series after the cutoff.
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| 2.0.12 | 09/17/19 | Added detail around when the Indicative Price or Reference Price would be zero. |
| 2.0.13 | 10/14/19 | - Buy Contracts and Sell Contracts will be calculated from perspective of Auction-Only Price when Indicative Price is zero and the Auction-Only Price is non-zero.
- Updated description of the SLOO adjustment reference to be the mid of the Opening Collar rather than the mid of the Composite Market.
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| 2.0.14 | 11/12/19 | Added notes indicating GTH will be sunset for EDGX and C2 (effective 11/22/19). |
| 2.0.15 | 11/15/19 | Added information detailing opening trigger for VIX options will be time-based, set to 9:30 a.m. ET (effective on C1 12/9/19). |
| 2.0.16 | 11/27/19 | Updated one MWC requirement for series opening (effective 12/5/19 for EDGX, effective 12/6/19 for C1 and C2). |
| 2.0.17 | 12/18/19 | Updated opening trigger requirements for Multi-list options (non-index products) (effective 1/16/20 for EDGX and 1/17/20 for C1 and C2). |
| 2.0.18 | 01/02/20 | Updated Max Composite Width and Opening Collar Width for EDGX Options (effective 1/19/20) |
| 2.0.19 | 01/03/20 | Added note indicating that VMIM Opening Process will be effective on BZX 01/30/20. |
| 2.0.20 | 02/04/20 | Removed Midpoint Uncross Opening Process section as BZX now uses Price Forming Opening Process to align with all other options exchanges. |
| 2.0.21 | 08/27/20 | Updated Opening Trigger description to note that options with an underlier that trades OTC will open on a timer. |
| 2.0.22 | 01/14/21 | Corrected Example 3 in Appendix 1. |
| 2.0.23 | 02/10/21 | Added new ‘Section 2.4.1 - Forced Openings’ describing new forced opening feature of the Multi-list opening process. Updated MCW table to reflect that OTC classes will always be 3x the configured width of C1 Options. (effective on EDGX 3/12/21, effective on BZX, C1, C2 3/15/21). |
| 2.0.24 | 03/25/21 | - Updated to include GTH/Curb-Enabled Proprietary category to class categories.
- Added notes indicating a new Curb Risk Limit will be introduced to support Curb session.
- Added Curb information to Table 4 - Queuing Period start times by option class category.
- Added Curb information to Table 8 - Opening Trigger by option class category and session.
- Added new 'Section 2.11 - GTH/Curb-Enabled Proprietary Opening'. Effective 11/21/21 Q4 2021.
- Added notes indicating expanded GTH hours.
- Added expanded GTH information to Table 4 - Queuing Period start times by option class category. Effective 11/21/21 Q4 2021.
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| 2.0.25 | 5/13/21 | - Added note about the Opening Collar Widths for OTC products.
- Updated Curb session effective date to TBD 09/27/21.
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| 2.0.26 | 06/15/21 | Updated extended GTH session effective date to 11/21/21. |
| 2.0.27 | 08/24/21 | Updated Curb session effective date to TBD. |
| 2.0.28 | 09/20/21 | Updated Figure 7 with Curb Trading Status value "L". Updated Technical Specification hyperlinks. |
| 2.0.29 | 11/04/21 | - Removed references to Curb session as Curb will not have an opening process upon launch.
- Updated Figure 7.
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| 2.0.30 | 12/9/21 | Removed old GTH session effective dates. |
| 2.0.31 | 01/14/22 | Clarified RTH queuing is available beginning at the same time as GTH queuing (i.e. 8:00 p.m. ET) for all GTH-enabled proprietary options. |
| 2.0.32 | 02/02/22 | Updated Curb session effective date to 04/25/22 TBD. |
| 2.0.33 | 04/04/22 | Updated Curb session effective date to 04/25/22. |
| 2.0.34 | 11/07/22 | Added XSP to GTH and Curb sessions (effective 12/11/22). |
| 2.0.35 | 03/01/24 | Updated constituent series symbol reference file link. |
| 2.0.36 | 07/22/24 | - Updated table numbers.
- Effective 08/26/24, GTH will be extended until 9:25 a.m. ET and the cutoff time moved to 9:26 a.m. ET (C1 only).
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| 2.0.37 | 01/15/25 | Updated with Cboe Titanium branding. |
| 2.0.38 | 04/23/25 | Added clarifying language to Opening Collars. |
| 2.0.39 | 07/14/25 | Updated multi-list series, excluding the SPX constituent series, will be eligible to be forced open without conducting an opening auction after a configurable period of time (effective 08/11/25). |
| 2.0.40 | 07/24/25 | Specification updated to indicate complex functionality is available for all Cboe Options Exchanges, with BZX Options complex functionality effective on 10/13/25. |
| 2.0.41 | 10/20/25 | Updated GTH-Enabled Proprietary Opening (C1) to remove reference to specific GTH symbols, replacing it with "GTH-eligible Products". |
| 2.0.42 | 04/15/26 | Updated Opening Triggers, Forced Multi-List Products Openings, Queuing Period and Opening Information Dissemination Start Times, Price Forming Opening Process, and added GTH-Enabled Propriety Opening (C1 Only) to reflect planned expansion of C1 trading hours for select equity options, including the addition of a morning Global Trading Hours (GTH) session and afternoon Curb session, subject to regulatory review (effective 07/13/26) 08/17/26 TBD). |
| 2.0.43 | 06/12/26 | Updated planned expansion of C1 trading hours for select equity options to 08/17/26. |
| 2.0.44 | 07/06/26 | - Updated VIX Options and Options with OTC Underlier field in Opening Triggers to VIX Options and Options with OTC Underlier and Options with Discrete Underlier.
- Updated No-GTH Proprietary Opening to include the "first index observation" criteria does not apply to options having timer-based opening triggers.
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| 2.0.45 | 08/10/26 | Updated planned expansion of C1 trading hours for select equity options to TBD. |
| 2.0.46 | 09/03/26 | Clarified GTH Queuing begins at 8:00 p.m. ET on prior calendar day. |
