# 2026-12412: Nasdaq ISE Postpones FLEX Trading System Upgrade Again

2026-12412, Self-Regulatory Organizations; Nasdaq ISE, LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Delay the Implementation of SR-ISE-2026-04, is a Federal Register notice from Securities and Exchange Commission published 2026-06-22, effective 2026-06-16; PRIA reads it as touching household money (as of 2026-06-29).

- Canonical: https://policyrisk.com/federal-register/2026-12412
- As of: 2026-06-29
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-12412
- Title: Self-Regulatory Organizations; Nasdaq ISE, LLC; Notice of Filing and Immediate Effectiveness of a Proposed Rule Change To Delay the Implementation of SR-ISE-2026-04
- Type: Notice
- Agencies: Securities and Exchange Commission
- Citation: 91 FR 37172
- Published: 2026-06-22
- Effective: 2026-06-16
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-06-29

## In one line

Nasdaq ISE Postpones FLEX Trading System Upgrade Again

## Summary

Nasdaq ISE is hitting the pause button and pushing back some planned upgrades to their electronic FLEX trading until December 20, 2027. This delay affects traders and firms using FLEX options, giving them more time to prepare for the new changes. No extra costs are mentioned, just a bit more breathing room before the new rules kick in.

## Effects PRIA read

- Nasdaq ISE Delays FLEX Upgrade: benefit, low. If you trade FLEX options or work at a firm that uses them, Nasdaq ISE delayed planned electronic FLEX enhancements. The implementation date is moved from being on or before December 20, 2026 to being on or before December 20, 2027, giving traders and firms one more year to finish systems changes,…

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## Sources
- [2026-12412 on federalregister.gov](https://www.federalregister.gov/documents/2026/06/22/2026-12412/self-regulatory-organizations-nasdaq-ise-llc-notice-of-filing-and-immediate-effectiveness-of-a)
- [2026-12412 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-06-22/pdf/2026-12412.pdf)

## Related
- [Previous: 2026-12411, Self-Regulatory Organizations; NYSE Texas, Inc.; Notice of Filing of Proposed R…](https://policyrisk.com/federal-register/2026-12411)
- [Next: 2026-12413, Joint Industry Plan; Notice of Filing and Immediate Effectiveness of Amendment…](https://policyrisk.com/federal-register/2026-12413)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-12412 (as of 2026-06-29).