Another Exchange Clock Service Hits the Trading Floor
Published Date: 3/31/2026
Notice
Summary
Cboe EDGX 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 17, 2026—no extra fees mentioned yet, but it’s a smart move for anyone serious about timing.
Analyzed Economic Effects
5 provisions identified: 4 benefits, 1 costs, 0 mixed.
Optional Exchange Clock Service Launched
If you run a trading firm, the Cboe EDGX Exchange began offering an optional Clock Service effective March 17, 2026. The service uses White Rabbit and Precision Time Protocol and provides a 1 Gbps physical port so subscribers can synchronize their primary clock to the Exchange's primary clock at up to sub-nanosecond precision.
Better Latency Measurement and Optimization
If you subscribe, the Clock Service lets you compare your timestamps to the Exchange's timestamps so you can tell whether time differences are latency or clock offset. That helps you analyze network efficiency, rebalance orders across connections, and potentially optimize trading models.
Hardware and Licensing Requirements
Subscribers that do not already have a White Rabbit clock device must buy one from a third-party vendor and procure any applicable licenses to use it. The Exchange will include a dedicated 1 Gbps Physical Port for the Clock Service, but the Exchange says it will file a separate rule change later to propose fees for the service.
Compliance and Surveillance Support
Subscribers may use the Clock Service to help evaluate compliance with clock synchronization requirements and for trade surveillance purposes. The Exchange states the service could assist subscribers in determining compliance with certain rules (for example, Rule 4.6).
Nanosecond Timestamp Precision Coming Soon
The Exchange will provide time-of-receipt timestamps at the nanosecond level by the end of March 2026, improving the granularity of timing information subscribers receive. This change complements the Clock Service by making Exchange timestamps more precise for latency comparisons.
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
2026-12163 — The Trade-Through Rule and Locked and Crossed Markets Provisions of Regulation NMS
The SEC wants to scrap some old rules that stop stocks from being traded at worse prices and prevent confusing market quotes. This change affects stock traders and exchanges, aiming to simplify trading and possibly speed things up. If you want to share your thoughts, you’ve got until August 17, 2026, so don’t miss out!
2026-10373 — Registered Offering Reform
The SEC wants to make it easier and cheaper for more companies to sell their stocks and bonds to the public. They’re opening up special forms and benefits to more businesses, updating rules to be more modern, and cutting red tape by overriding some state rules. If you’re a company planning to raise money, these changes could speed things up and save you money, with feedback due by July 27, 2026.
2026-10222 — Enhancement of Emerging Growth Company Accommodations and Simplification of Filer Status for Reporting Companies
The SEC is making it easier for companies that report their finances by simplifying their categories into just two groups: big and small filers. Smaller companies, including emerging growth ones, will get more time to file reports and enjoy simpler rules, while big companies keep stricter standards. These changes aim to save time and money, with feedback open until July 20, 2026.
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!
2026-14106 — Self-Regulatory Organizations; Cboe Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Its Fee Schedule for Its Complex Order Book Data Feed
Cboe Exchange is updating the fees for its Complex Order Book Data Feed, especially changing the Retail Broker Waiver Program based on customer feedback. This means brokers using this data feed might see new fee rules starting right away. The goal is to keep things fair and clear for everyone using Cboe’s data services.
2026-14104 — Self-Regulatory Organizations; Cboe Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Remove the Silexx Logical Port Fee Waiver in the Fee Schedule in Accordance With SEC Exemptive Relief Issued
Starting July 1, 2026, Cboe Exchange is ending the free ride on the Silexx logical port fee—meaning traders will now pay this fee like usual. This change affects anyone using these ports to connect and could add a bit to their costs. The update is official and effective immediately, so no more fee waivers from now on!
Previous / Next Documents
Previous: 2026-06147 — Sunshine Act Meetings
The SEC’s Small Business Capital Formation Advisory Committee will hold a public meeting on April 28, 2026, both in-person and online. They’ll discuss new rules to help small and growing businesses and their investors. This open meeting lets everyone watch and stay informed about important changes that could impact small business funding.
Next: 2026-06149 — Self-Regulatory Organizations; Texas Stock Exchange LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Implement a Warrant Performance Incentive Program
The Texas Stock Exchange is launching the Rodeo Program, a cool new incentive where members who pay a prepayment fee get special tickets to buy shares in the parent company if trading hits certain goals. This program kicks off on September 1, 2026, and runs for a year, encouraging more trading and rewarding members with potential ownership perks. It’s a win-win for the Exchange and its members aiming to boost market action!