Effective May 18, 2026, Cboe will introduce the new Cboe Clock Service to allow market participants to align their infrastructure directly to Cboe’s market clock, subject to regulatory review.

Upon the effective date, the new Cboe Clock Service will be available in the Equinix NY4 and NY5 data centers.

The Cboe Clock Service will provide the following benefits:

• Exchange-aligned, resilient timing to support trading, compliance, and operational workflows
• Synchronization directly to a Cboe-aligned reference, reducing timing risk and ambiguity
• Consistent, high-quality time across critical systems in support of regulatory and operational requirements.

The new Cboe Clock Service uses White Rabbit technology to deliver sub-microsecond time accuracy and nanosecond-level synchronization precision via dedicated fiber connections. The service compliments Cboe’s timestamping and reporting products by aligning users’ internal clocks with exchange side timestamps.

A single subscription to the Cboe Clock Service allows users to synchronize their systems across all Cboe markets available in NY4 and NY5. The service is not available for disaster recovery.

A Cboe Clock Service subscription includes a 1 GB physical port connection to receive the service. Users can order the Cboe Clock Service through the Physical Connection Request Tool located in the Cboe Customer Web Portal.

On the effective date, the Cboe Clock Service will be offered as a monthly subscription per 1 GB physical port connection.

Users may obtain additional Cboe Clock Service connections for redundancy or other purposes which would be subject to an additional fee.