Cboe Options Adds New Columns to the Options Underlying Reference Data File

Effective trade date June 8, 2026, Cboe Options Exchange (C1) will add eight new columns to the end of the C1 Underlying Reference Data File as detailed below.

To support C1 expanded trading hours for select equity options and C1 Mini S&P 500 Index Binary Options, the following eight columns will be added to the end of the C1 Underlying Reference Data File upon the effective date:

• Option Type
• Clearing
• GTH Eligible
• Curb Eligible
• GTH DPM
• GTH DPM Name
• GTH DPM EFID
• GTH DPM Firm ID

This functionality is currently available for testing in the C1 certification environment.

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