# 2025-20690: Cboe Tweaks Trading Rules in Latest SEC Filing Snooze

2025-20690, Self-Regulatory Organizations; Cboe Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Rule 5.1, is a Federal Register notice from Securities and Exchange Commission published 2025-11-24, effective 2025-09-26 (as of 2026-06-08).

- Canonical: https://policyrisk.com/federal-register/2025-20690
- As of: 2026-06-08
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2025-20690
- Title: Self-Regulatory Organizations; Cboe Exchange, Inc.; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Amend Rule 5.1
- Type: Notice
- Agencies: Securities and Exchange Commission
- Citation: 90 FR 53018
- Published: 2025-11-24
- Effective: 2025-09-26
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-06-08

## In one line

Cboe Tweaks Trading Rules in Latest SEC Filing Snooze

## Summary

Cboe Exchange is updating its rules to let traders buy and sell options on the new Magnificent 10 Index during both regular and extended trading hours. This change means more chances to trade and react to market moves throughout the day. The update is effective immediately, so traders can jump in right away without any extra fees or delays.

## Effects PRIA read

- MGTN Options Trade During Extended Hours: benefit, low. The Exchange will permit options on the Cboe Magnificent 10 Index (MGTN) to trade during Global Trading Hours (GTH) and Curb Trading Hours in addition to Regular Trading Hours. GTH are from 8:15 p.m. (previous day) to 9:25 a.m., Monday through Friday, and Curb is from 4:15 p.m. to 5:00 p.m., Monday…
- FLEX MGTN Options Eligible During Extended Hours: benefit, low. If the Exchange designates MGTN options for GTH or Curb, FLEX options with the same MGTN underlying are also deemed eligible to trade during those sessions. The rule amendment adds MGTN to the list of products eligible for GTH and Curb.
- TPHs May Elect to Trade MGTN in Extended Sessions: benefit, low. All Trading Permit Holders (TPHs) will be able, but are not required, to trade MGTN options during GTH and Curb if the Exchange lists the product for those sessions. The rule simply extends permissible trading hours for a product that will trade during Regular Trading Hours.

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## Sources
- [2025-20690 on federalregister.gov](https://www.federalregister.gov/documents/2025/11/24/2025-20690/self-regulatory-organizations-cboe-exchange-inc-notice-of-filing-and-immediate-effectiveness-of-a)
- [2025-20690 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-11-24/pdf/2025-20690.pdf)

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- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2025-20690 (as of 2026-06-08).