SEC Proposes Historic Overhaul: The End of Regulation NMS Rules 611 and 610(e)

WASHINGTON, D.C. — June 11, 2026 — In a move that signals a seismic shift in the architecture of the United States equity markets, the Securities and Exchange Commission (SEC) announced today that it is seeking to rescind two of the most consequential components of Regulation National Market System (Reg NMS): Rule 611, commonly known as the "Order Protection Rule," and Rule 610(e), which governs access fees.

The proposal, unveiled by SEC Chairman Paul S. Atkins, represents the most significant regulatory pivot in equity market structure since the inception of Reg NMS in 2005. By dismantling these pillars, the Commission aims to reduce market complexity, lower costs for institutional and retail investors alike, and foster a new era of competitive innovation.

The Core Proposal: Dismantling the Status Quo

At the heart of the SEC’s announcement is the desire to move away from prescriptive, government-mandated routing requirements toward a more market-driven ecosystem.

The Order Protection Rule (Rule 611)

Rule 611, or the "Trade-Through Rule," was designed to ensure that investors received the best price available across all trading venues. It requires trading centers to establish, document, and enforce policies and procedures reasonably designed to prevent "trade-throughs"—the execution of an order at a price inferior to the best protected bid or offer displayed by another venue.

Critics have long argued that this rule, while well-intentioned, created an overly fragmented market. It forced firms to route orders to venues based solely on price, often ignoring the "latency" or technical speed of the connection, which led to the proliferation of high-frequency trading (HFT) strategies that capitalize on these mandatory routing requirements.

Access Fees (Rule 610(e))

Rule 610(e) currently places a cap on the fees that exchanges can charge for accessing their protected quotations. By proposing the rescission of this rule, the SEC is effectively suggesting that the market should determine the cost of accessing liquidity. The Commission posits that if the mandate for "protected" quotes is removed, the necessity for a government-imposed cap on access fees diminishes, potentially allowing exchanges and alternative trading systems (ATS) to compete more aggressively on price and service quality.

A Two-Decade Chronology: From Innovation to Stagnation

To understand the weight of today’s decision, one must look back at the trajectory of the U.S. markets since the early 2000s.

• 2005: The Birth of Reg NMS. The SEC adopted Regulation NMS to modernize and consolidate the fragmented U.S. securities markets. The goal was to ensure that all investors received the best execution possible, regardless of where they traded.
• 2007: Full Implementation. Rules 611 and 610(e) took full effect. The market responded with a rapid increase in the number of trading venues and an explosion in electronic trading technology.
• 2010–2015: The Rise of Fragmentation. As technology advanced, critics noted that the "best price" mandate was being exploited by latency arbitrageurs. The market became increasingly segmented, with dozens of dark pools and exchanges creating a "spaghetti" of connectivity.
• 2020–2025: Regulatory Reflection. Following several market volatility events and increasing pressure from both retail brokers and institutional asset managers, the SEC began a multi-year review of market structure. Concerns grew that the "intended consequences" of Reg NMS were being overshadowed by its "unintended costs."
• June 2026: The Proposal. The SEC formally initiates the rescission process, citing a need to return to fundamental competition.

Supporting Data: Why Now?

The Commission’s decision to move forward is supported by extensive economic analysis conducted by the SEC’s Division of Economic and Risk Analysis (DERA). Key data points influencing the decision include:

1. Increased Market Complexity: SEC research indicates that the number of "message traffic" events—the data packets sent between exchanges and market participants—has increased by over 400% since 2010. This complexity adds significant operational costs to brokers, which are eventually passed down to the end investor.
2. Diminishing Returns on Protected Quotes: Analysis shows that the "depth of book" available at the best bid or offer (BBO) has decreased significantly. In many cases, the "best price" protected by Rule 611 represents a negligible number of shares, yet brokers are forced to route to those venues, incurring high connectivity costs for minimal liquidity.
3. The "Hidden" Cost of Fees: The tiered structure of access fees, combined with rebates, has created a "maker-taker" model that often incentivizes volume over quality. The SEC’s data suggests that these rebates may create conflicts of interest that distort routing decisions, contrary to the goal of best execution.

Official Responses: A Divided Industry

The proposal has ignited a fierce debate among market participants, drawing both praise and skepticism.

The SEC’s Stance

"After two decades of Rule 611, it is high time that the Commission review its unintended consequences that have hindered — rather than enhanced — the long-term growth of our markets," said SEC Chairman Paul S. Atkins. "This proposal is intended to simplify market structure and reduce costs for market participants while allowing competition, innovation, and other market forces to shape the continuing evolution of our equity markets."

Market Participants

• Retail Brokerage Firms: Generally, major retail brokers have expressed cautious optimism. Many have long argued that the regulatory burden of maintaining complex routing technology to comply with Reg NMS is a barrier to entry for smaller firms.
• The Exchanges: The reaction from major stock exchanges has been mixed. While some appreciate the move toward deregulation, others fear that removing the protection of quotes will lead to a "race to the bottom," where liquidity fragments even further, making it harder for institutional investors to execute large trades without moving the market price.
• Institutional Investors: Pension funds and mutual funds are expressing concern over how "best execution" will be defined in a post-Rule 611 world. If the government is no longer mandating where to go for the best price, these fiduciaries fear they may be held liable if they fail to secure the best possible terms for their beneficiaries.

Implications: The Road Ahead

The potential rescission of these rules is not merely a technical change; it is a fundamental shift in philosophy.

1. Shift Toward "Principles-Based" Regulation

The SEC is signaling a transition away from rigid, "rule-based" compliance toward a "principles-based" approach. By removing the specific mandates of Rule 611, the Commission is placing the onus back on the broker-dealer to fulfill their fiduciary duty of best execution, rather than simply checking a box to ensure they didn’t "trade-through."

2. Potential for Increased Innovation

With the removal of the requirement to route to protected venues, developers may have more freedom to design trading algorithms that prioritize execution speed, privacy, or liquidity sourcing, rather than routing solely to comply with the Order Protection Rule. This could lead to a new generation of ATS platforms that are faster and more tailored to specific asset classes.

3. Increased Risk of "Market Fragmentation"

Conversely, the risk of extreme fragmentation remains a significant concern. Without a centralized "protected" price, market participants may have to aggregate their own data to determine the true state of the market, potentially creating a "two-tier" system where only those with the most sophisticated data infrastructure can see the full picture.

4. The Comment Period

The SEC has opened a 60-day window for public comment. This period is expected to be one of the most heavily scrutinized in the Commission’s history. The SEC will be looking for empirical evidence from market participants on how they intend to maintain best execution in an environment without Rule 611.

Conclusion

The proposed rescission of Rules 611 and 610(e) is a watershed moment for the U.S. financial system. While the SEC frames this as a necessary step to reduce complexity and unleash innovation, the industry remains deeply divided on whether the benefits of deregulation will outweigh the risks of losing a uniform, albeit imperfect, market standard.

As the comment period commences, the focus will shift to how the SEC intends to define "best execution" in the absence of the very rules that have defined that concept for the last twenty years. The outcome of this proposal will likely dictate the structure of the U.S. equity markets for the next generation.

For more information on the proposal and instructions on how to submit comments, please visit the official SEC website at sec.gov.