Stock Traders Get Official Exchange Clock Sync Service Now
Published Date: 4/16/2026
Notice
Summary
Cboe BZX Exchange just launched a new Clock Service that helps traders sync their clocks perfectly with the Exchange’s time. This optional tool is open to everyone who trades on BZX, making it easier to measure trade timing accurately. The change is effective immediately, so members can start using it right away without extra costs.
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6 provisions identified: 3 benefits, 2 costs, 1 mixed.
Optional High‑Precision Clock Service
The Exchange now offers an optional Clock Service to Members and non‑Members that uses White Rabbit and Precision Time Protocol (PTP) to let subscribers synchronize their primary clocks to the Exchange's primary clock. The service can provide up to sub‑nanosecond precision so latency‑sensitive traders can measure time differences between their systems and the Exchange more accurately.
Includes Dedicated 1 Gbps Physical Port
As part of the Clock Service, subscribing firms will receive a dedicated 1 Gbps Physical Port from the Exchange that is to be used solely for the Clock Service. One 1 Gbps port will allow a subscriber to receive the Clock Service for the Exchange and its affiliated equities and options exchanges.
Third‑Party White Rabbit Hardware Required If Missing
Firms that do not already have White Rabbit clock synchronization devices must acquire those devices (and any required licenses) from third‑party vendors to use the Clock Service. The Exchange states participants are responsible for procuring applicable licenses and devices.
Exchange Will File Separate Fee Proposal
The Exchange intends to submit a separate filing under Section 19(b)(1) to propose fees for the Clock Service. The current rule filing does not set Clock Service fees; fee proposals will come in a later filing.
Helps Latency Measurement and Compliance
Subscribers can use the Clock Service to more precisely measure latency, analyze network efficiency, optimize routing or trading models, and assist with trade surveillance and evaluating compliance with clock synchronization requirements (see Rule 4.6).
Managed Service Providers May Redistribute Clock
Managed service providers may subscribe to the Exchange's Clock Service and redistribute the Cboe Clock to downstream clients. The Exchange anticipates managed service providers could use the service to supply time synchronization to their customers.
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