Cboe Adds Clock Service: Because Traders Need Perfect Time Alignment
Published Date: 3/30/2026
Notice
Summary
Cboe Exchange is launching a new Clock Service that helps traders and firms sync their clocks with the Exchange’s time. This makes tracking orders and messages super accurate and easier for everyone involved. The service is optional, open to all, and already effective as of March 16, 2026—no extra fees or delays announced yet!
Analyzed Economic Effects
3 provisions identified: 1 benefits, 1 costs, 1 mixed.
Optional Cboe Exchange Clock Service
Cboe launched an optional Clock Service available to Members and non-Members effective March 16, 2026. The service supplies the Exchange's White Rabbit/PTP time signal (up to sub-nanosecond accuracy) so subscribers can synchronize their primary clocks to the Exchange and measure latency more precisely; the Exchange also intends to provide timestamps at nanosecond precision by the end of March.
Third-Party White Rabbit Hardware Needed
Participants that do not already have a White Rabbit clock synchronization device must acquire one from third-party vendors to use the Clock Service; participants are responsible for procuring any applicable licenses. The Exchange does not provide the White Rabbit device or optics.
1 Gbps Port Included; Fees Will Be Filed
The Clock Service includes a dedicated 1 Gbps Physical Port (to be used solely for the Clock Service and not for order routing). The Exchange intends to file a separate rule change to propose fees for the Clock Service, so subscription costs will be determined in a future filing.
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Previous: 2026-06046, Self-Regulatory Organizations; Cboe C2 Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Introduce an Exchange Clock Service
Cboe C2 Exchange is rolling out a new Clock Service that helps traders sync their clocks with the Exchange’s time for super accurate tracking of orders and messages. This optional service is open to all traders and could boost fairness and speed in trading. It’s effective immediately, so anyone interested can jump on board without delay—no extra fees mentioned yet!
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