# Federal Register #SR-PHLX-2026-65

Nasdaq PHLX proposes removing CORE FIX references from its Equity 4 rulebook

**Buyer:** Securities and Exchange Commission
**Posted:** November 12, 2026
**Identifier:** SR-PHLX-2026-65
**NAICS:** 523210

The SEC notice covers a proposed Nasdaq PHLX rulebook change, not a procurement opportunity.
- **Government agency:** Securities and Exchange Commission (SEC); no government buyer or purchasing office is identified.
- **Filing organization:** Nasdaq PHLX LLC.
- **Proposal:** Remove CORE FIX references from Equity 4, including Rules 3100, 3301A, 3301B, and 3307, because PHLX does not plan to deploy CORE FIX.
- **Protocols retained:** OUCH, RASH, FLITE, and FIX.
- **Operational impact:** PHLX says the change would not affect market operations, order treatment, or participants’ rights and obligations.
- **Procurement items:** No products, services, quantities, or part numbers are requested.

### Description

Nasdaq PHLX LLC proposes to amend Equity 4 by removing all references to its CORE FIX order entry protocol, which it will not deploy. The references are in Rules 3100, 3301A, 3301B, and 3307. The Exchange says it will continue offering the OUCH, RASH, FLITE, and FIX protocols, and that the change will not alter market operations, order treatment, or participants’ rights and obligations. The SEC published the notice to solicit comments on the proposed rule change.

[View original listing](https://www.federalregister.gov/documents/2026/11/12/2026-22957/self-regulatory-organizations-nasdaq-phlx-llc-notice-of-filing-and-immediate-effectiveness-of-a)