Effective trade date April 27, 2026, subject to regulatory review, Cboe Options Exchange (C1) and EDGX Options Exchange (EDGX) will permit appointed market makers in a class to participate as the paired contra side order to a single-leg AIM or SAM auction order in that class.

This functionality is currently available in SPX/W for C1 and will be extended to all classes for both exchanges on the effective date.

Upon the effective date, AIM and SAM orders submitted with a OrderCapacity = M (Market Maker) paired contra side order will be accepted for all eligible option classes, regardless of whether the contra EFID holds a class appointment. Currently, orders where the contra EFID holds a class appointment (except in SPX/W for C1) are rejected.

This functionality is currently available for testing in the C1 and EDGX certification environments.