# 2026-11811: Cboe EDGX Begins Billing for Clock Synchronization

2026-11811, Self-Regulatory Organizations; Cboe EDGX Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Adopt Fees for Its New Clock Service, is a Federal Register notice from Securities and Exchange Commission published 2026-06-12, effective 2026-05-18; PRIA reads it as touching household money (as of 2026-06-19).

- Canonical: https://policyrisk.com/federal-register/2026-11811
- As of: 2026-06-19
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-11811
- Title: Self-Regulatory Organizations; Cboe EDGX Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Adopt Fees for Its New Clock Service
- Type: Notice
- Agencies: Securities and Exchange Commission
- Citation: 91 FR 35729
- Published: 2026-06-12
- Effective: 2026-05-18
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-06-19

## In one line

Cboe EDGX Begins Billing for Clock Synchronization

## Summary

Cboe EDGX Exchange just rolled out a new Clock Service that helps users sync their time systems perfectly with the Exchange. Starting May 18, 2026, they’re charging fees for this service but also offering a free trial to get everyone on board. This change affects both members and non-members who want accurate timing for their trades and data.

## Effects PRIA read

- Monthly Clock Service Fee: cost, high. If your firm subscribes to Cboe's Clock Service, the Exchange will charge $7,500 per month for the service starting May 18, 2026. That monthly fee includes a single 1 Gbps physical port to receive the Clock Service signal and firms may cancel at any time.
- Optional Redundant Connection Fee: cost, high. If your firm wants a backup Clock Service connection, Cboe will charge an optional $2,500 per month for a redundant 1 Gbps physical port. Firms may buy multiple secondary connections and this fee is charged in addition to the $7,500 monthly service fee.
- One-Time HATI Licensing Setup Fee: cost, high. If your firm does not use a Safran White Rabbit switch, you must pay a one-time High-Accuracy Timing IP Core (HATI) setup license fee of $5,000 for each physical connection to use the Clock Service. For example, if you need licensing for two connections the one-time cost would be $10,000.
- 30-Day Free Trial for New Subscribers: benefit, high. First-time subscribers to Cboe Clock Service get a 30-day free trial that waives the $7,500 Clock Service monthly fee for the first 30 days, but firms still must pay any one-time HATI setup fee ($5,000 per connection) and any fees for additional connections. The trial applies only to subscribers wh…
- Service Features and Port Restrictions: mixed, medium. The Clock Service provides a White Rabbit time signal via a 1 Gbps physical port (included with the $7,500 fee) so subscribers can synchronize their primary clocks to the Exchange at a more granular (sub-nanosecond) level, and the port must be used solely for the Clock Service (not for order routin…

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## Sources
- [2026-11811 on federalregister.gov](https://www.federalregister.gov/documents/2026/06/12/2026-11811/self-regulatory-organizations-cboe-edgx-exchange-inc-notice-of-filing-and-immediate-effectiveness-of)
- [2026-11811 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-06-12/pdf/2026-11811.pdf)

## Related
- [Previous: 2026-11810, Self-Regulatory Organizations; Cboe EDGX Exchange, Inc.; Notice of Filing and I…](https://policyrisk.com/federal-register/2026-11810)
- [Next: 2026-11812, Self-Regulatory Organizations; Cboe EDGA Exchange, Inc.; Notice of Filing and I…](https://policyrisk.com/federal-register/2026-11812)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-11811 (as of 2026-06-19).