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.
Your PRIA Score
Personalized for You
How does this regulation affect your finances?
Sign up for a PRIA Policy Scan to see your personalized alignment score for this federal register document and every other regulation we track. We analyze your financial profile against policy provisions to show you exactly what matters to your wallet.
Key Dates
Department and Agencies
Related Federal Register Documents
2026-07651 — Concept Release on Consolidated Audit Trail and Other Audit Trails and Data Sources
The SEC wants your thoughts on how it tracks stock market trades using the Consolidated Audit Trail and other data tools. They’re thinking about updating rules to keep up with new tech, privacy, and security needs, and to make sure the system is fair and cost-effective. If you’re involved in the stock market or data tracking, speak up by June 22, 2026!
2026-09992 — Agency Information Collection Activities; Proposed Collection; Comment Request; Extension: Rule 611
The SEC is asking to keep collecting info from about 305 financial firms to make sure they follow Rule 611, which stops bad trades that hurt investors. These firms spend around 60 hours a year updating their rules to avoid trading at worse prices than others. This extension keeps things running smoothly with an estimated yearly cost of about $9.5 million for legal and compliance work.
2026-09960 — Self-Regulatory Organizations; MIAX Emerald, LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Exchange Rule 515A, MIAX Emerald Price Improvement Mechanism and PRIME Solicitation Mechanism
MIAX Emerald is updating its rules to let Market Makers join special auctions called PRIME and cPRIME as potential trading partners. This change helps speed up trades and could improve prices for investors using these options. The new rule took effect right after filing on May 1, 2026, so Market Makers and traders should get ready for smoother, faster deals!
2026-09967 — Self-Regulatory Organizations; Cboe EDGX Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Chapter 8 of the Exchange's Rulebook Relating To Investigative and Disciplinary Matters
Cboe EDGX Exchange is updating its rules about how it investigates and disciplines its members and their associates. These changes clarify who the Exchange can discipline and improve the process to keep things fair and clear. The new rules took effect right after filing on May 4, 2026, with no new fees involved.
2026-10015 — U.S. Bancorp, et al.; Notice of Application and Temporary Order
U.S. Bancorp and its partners got a temporary green light to keep doing some fund services despite a court order against BTIG from 2022. This temporary okay lasts until the SEC decides on a permanent solution, so things keep running smoothly without money hiccups. If you want to speak up, you’ve got until June 9, 2026, to ask for a hearing.
2026-09990 — Self-Regulatory Organizations; 24X National Exchange LLC; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Amend 24X Rule 1.5(c) To Extend by Seven (7) Months the Deadline by Which 24X Must File With the Commission the 24X Market Session Proposed Rule Change Regarding the Commencement of the 24X Market Session
24X National Exchange is getting an extra seven months to file a rule change about when their market session starts. This gives them more time to get everything just right before sharing it with the SEC. Traders and market watchers should keep an eye out for updates, but no money changes or risks are happening right now.
Previous / Next Documents
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!
Next: 2026-06050 — Taking and Importing Marine Mammals; Taking Marine Mammals Incidental to the Washington State Parks and Recreation Commission's Marine Facilities Replacement Program in North Puget Sound, Washington
The Washington State Parks want permission to accidentally disturb marine mammals while fixing up marine facilities in North Puget Sound for the next 5 years. The National Oceanic and Atmospheric Administration (NOAA) is asking the public to share their thoughts by April 29, 2026. This project affects local sea animals but helps improve park facilities without a direct cost impact mentioned.