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T4 SEC Medium Confidence Proposed Rule

SEC Proposes Rescission of Regulation NMS Rules 611 and 610(e)

Market structure modernization and reduction of regulatory constraints on equity trading

MODERATE
Impact Level
Top: operational (4)

Classification

Regulatory Program
Regulation NMS
Doc Type
Proposed Rule
Effective Date
Days to Action
Comment Deadline
Published

Urgency Basis

Proposed rule with 60-day comment period, no specified effective date beyond comment period

Operational Context

Flags
Systems Change Required Examination Focus Legal Review Required Model Validation Trigger
Affected Functions
Trading Operations Compliance Risk Management Technology Best Execution Market Data
Institution Applicability
Broker-Dealers Investment Advisers Market Makers High Frequency Trading Firms Electronic Trading Platforms

Impact by Category

Compliance
3
Operational
4
Data Governance
2
Model Risk
3
Reporting & Disclosure
2
Capital & Liquidity
1
Consumer Protection
2
Third-Party Risk
3

Key Requirements

- Assess impact of removing trade-through prohibition on order routing strategies - Update trading systems to operate without quote locking restrictions - Revise best execution policies and procedures for new market structure - Recalibrate algorithmic trading models for changed market dynamics - Update compliance monitoring for modified market structure rules - Review vendor agreements for market data and trading platform changes

Scoring Rationale

This proposed rescission represents a fundamental shift in U.S. equity market structure by removing long-standing investor protections. While still in proposal stage, the operational implications are significant for trading infrastructure, algorithms, and compliance frameworks. The moderate aggregate score reflects substantial operational and model risk impacts balanced against lower immediate compliance urgency due to proposal status.

Scored: 2026-06-12T18:01:27.794Z Model: claude-sonnet-4-20250514 Confidence: Medium Aggregate Score: 2.5
AI Analysis Disclosure — This record, including its scores, impact assessments, and Advisory Assessment (impact, risk, and recommended actions), was generated by an AI model and may contain errors or omissions. The Advisory Assessment is a starting point for analysis, not a substitute for professional judgment. Effective dates, applicability determinations, impact assessments, and any recommended actions should be independently verified against primary regulatory source documents and reviewed by qualified compliance or legal personnel before taking compliance action. This output does not constitute legal or compliance advice.