# 2026-11823: NYSE Codifies Best Execution Protections

2026-11823, Self-Regulatory Organizations; NYSE American LLC; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Adopt New Rule 5310 (Best Execution), is a Federal Register notice from Securities and Exchange Commission published 2026-06-12, effective 2026-05-29; PRIA reads it as touching household money (as of 2026-06-19).

- Canonical: https://policyrisk.com/federal-register/2026-11823
- As of: 2026-06-19
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-11823
- Title: Self-Regulatory Organizations; NYSE American LLC; Notice of Filing and Immediate Effectiveness of Proposed Rule Change To Adopt New Rule 5310 (Best Execution)
- Type: Notice
- Agencies: Securities and Exchange Commission
- Citation: 91 FR 35712
- Published: 2026-06-12
- Effective: 2026-05-29
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-06-19

## In one line

NYSE Codifies Best Execution Protections

## Summary

NYSE American just rolled out a new Rule 5310 to make sure brokers always get the best deal when handling your orders. This change affects all member firms and their staff, aiming to protect customers and boost order efficiency starting immediately. No big money changes yet, but it’s a smart move to keep your trades sharp and fair!

## Effects PRIA read

- New Best-Execution Duty for Brokers: benefit, low. The Exchange adopted Rule 5310 requiring member firms and their associated persons to use "reasonable diligence" to find the best market and execute customer orders so the price is as favorable as possible. The rule lists five explicit factors to consider (market character, order size/type, number…
- Ban on Unjustified Interpositioning: benefit, low. Rule 5310 prohibits member firms and associated persons from interposing a third party between the firm and the best market in a way that is inconsistent with the best-execution duty. When a firm must use a broker's broker to get an advantageous execution, the retail firm bears the burden of showin…
- Customer-Directed Routing Clarified: mixed, low. Supplementary Material .03 says if a customer gives an unsolicited instruction to route their order to a particular market, the firm does not have to seek a better market beyond that instruction, but must process the order promptly and per its terms. If the customer directs their order to another m…
- Harmonized Standards Across Exchanges: benefit, low. The Exchange adopted Rule 5310 based on Nasdaq PHLX and NYSE rules to harmonize best-execution and interpositioning standards across self-regulatory organizations. The Exchange says harmonization will promote consistent protections for customer order execution.
- Immediate Effect and Comment Timeline: benefit, low. The Exchange filed Rule 5310 on May 29, 2026 and the rule became effective upon filing; it will become operative 30 days from the filing date, the Commission may suspend it within 60 days, and public comments are due on or before July 6, 2026. Member firms should expect the obligations to take effe…

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## Sources
- [2026-11823 on federalregister.gov](https://www.federalregister.gov/documents/2026/06/12/2026-11823/self-regulatory-organizations-nyse-american-llc-notice-of-filing-and-immediate-effectiveness-of)
- [2026-11823 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-06-12/pdf/2026-11823.pdf)

## Related
- [Previous: 2026-11822, Agency Forms Undergoing Paperwork Reduction Act Review](https://policyrisk.com/federal-register/2026-11822)
- [Next: 2026-11824, Self-Regulatory Organizations; Nasdaq PHLX LLC; Notice of Filing and Immediate…](https://policyrisk.com/federal-register/2026-11824)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-11823 (as of 2026-06-19).