SEC Moves to Rescind Regulation NMS Rules 611 and 610(e): A Pivotal Shift in Market Structure

WASHINGTON, D.C. — June 11, 2026 — In a move that signals the most significant overhaul of U.S. equity market architecture in two decades, the Securities and Exchange Commission (SEC) announced today that it has formally proposed amendments to rescind Rules 611 and 610(e) of Regulation National Market System (NMS). This development marks a potential end to the "Order Protection Rule" era, a regulatory framework that has defined how stocks are traded, routed, and priced since its inception in 2005.

The proposal, which was unveiled during an open meeting at the Commission’s headquarters, aims to strip away layers of regulatory complexity that critics argue have fragmented market liquidity and stifled technological innovation. By inviting public discourse on the repeal, Chairman Paul S. Atkins has initiated what promises to be a contentious and highly consequential debate regarding the future of the American financial ecosystem.

The Core Proposal: Unpacking the Rescission

At the heart of the SEC’s announcement is the intent to dismantle the cornerstone of Regulation NMS. Rule 611, commonly known as the "Trade-Through Rule," currently mandates that trading centers establish policies and procedures to prevent the execution of trades at prices inferior to the best-displayed quotations across all markets. Simultaneously, Rule 610(e) addresses access fees, limiting the charges that trading centers can impose for accessing their protected quotations.

"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," Chairman Atkins stated in his opening remarks. "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."

The SEC’s rationale centers on the belief that the current mandates have created a "check-the-box" regulatory environment that encourages fragmentation. By forcing brokers to chase the best-displayed price across multiple, often disparate, venues, the SEC argues that the rules have inadvertently incentivized the proliferation of private trading venues and dark pools, ultimately reducing the transparency of the consolidated tape.

Chronology: Two Decades of Regulation NMS

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

• 2005: The Birth of Reg NMS. The SEC adopted Regulation NMS to modernize the markets, intending to link disparate exchanges into a single, cohesive national market system. The Order Protection Rule (611) was designed to ensure that investors received the best price available, regardless of where they placed their order.
• 2010–2015: The Rise of High-Frequency Trading (HFT). As markets became increasingly automated, critics began to argue that Rule 611 was fueling a "race to the bottom," where speed became the primary competitive advantage over price discovery.
• 2016–2022: Market Fragmentation Concerns. Studies repeatedly highlighted that while the "best price" was technically achieved, the cost of routing orders through multiple exchanges—and paying associated access fees—negated the benefits for retail and institutional investors alike.
• 2024: The Call for Deregulation. A series of roundtable discussions and white papers from academic institutions and industry trade groups suggested that the rigid structure of the 2005 rules was no longer compatible with modern, cloud-based, and AI-driven trading platforms.
• June 2026: The Proposal. The SEC formally proposes the repeal, opening a 60-day window for public comment.

Supporting Data: Why Now?

The Commission’s decision is supported by a growing body of research suggesting that the costs of maintaining compliance with the Order Protection Rule have begun to outweigh its benefits.

The Cost of Fragmentation

Current data suggests that U.S. equity markets have fragmented into over 16 national securities exchanges and dozens of off-exchange trading venues. Under the current regime, brokers must maintain complex routing technology to satisfy Rule 611. The SEC’s internal analysis suggests that a significant percentage of retail brokerage costs are tied to the technology required to navigate this fragmented landscape.

The Access Fee Dilemma

Rule 610(e) was intended to prevent excessive fees, but critics argue it created a "rebate-based" business model for exchanges. By capping fees, the regulation effectively standardized the economic model of exchanges, preventing them from competing on superior service, data quality, or unique liquidity offerings. Proponents of the repeal argue that by removing these constraints, the market will naturally gravitate toward more efficient, lower-cost venues.

Official Responses: A Divided Industry

The reaction from the financial services sector has been immediate and polarized.

The Pro-Reform Perspective

Market makers and proponents of increased deregulation have lauded the move. Many argue that the "best execution" requirement should be a fiduciary duty of the broker, not a mechanical requirement of the exchange. They contend that if the SEC removes the artificial mandate to route based on displayed price, competition will force exchanges to improve their technology to attract order flow organically.

"We have been operating under 20-year-old software in a world that has moved to AI and real-time decentralized processing," said a senior partner at a major quantitative hedge fund. "Rescinding these rules allows for the return of natural price discovery."

The Skeptical Perspective

Conversely, investor advocacy groups have expressed alarm. The primary concern is that without the "Order Protection" mandate, retail investors could be sidelined by large institutional players who might prioritize their own proprietary execution speeds over the fair treatment of smaller orders.

"The Trade-Through Rule was the only thing preventing a two-tiered market," noted a spokesperson for a retail investor protection coalition. "If you remove the requirement to honor the best price, you are essentially asking for a return to the ‘Wild West’ of the 1990s."

Implications: The Road Ahead

The repeal of Rules 611 and 610(e) would represent a fundamental shift in the SEC’s philosophy, moving from a prescriptive, rules-based framework to a more principles-based oversight model.

For Exchanges

Exchanges will likely be forced to pivot their business models. Without the ability to rely on the regulatory protection of their quotes, exchanges will have to compete on the quality of their liquidity, the latency of their matching engines, and the value of their data products. We may see a wave of consolidation as smaller, less efficient exchanges struggle to compete without the artificial support of the NMS structure.

For Broker-Dealers

Brokers will face a shift in liability. If the SEC removes the mechanical mandate of Rule 611, brokers will need to lean heavily on their "Best Execution" obligations. This will require firms to update their internal compliance monitoring systems to prove to regulators that their routing decisions—regardless of where they send an order—are in the best interest of their clients.

For the Regulator

For the SEC, this is a test of its ability to manage a transition. Chairman Atkins has emphasized a "careful, deliberative approach." The agency must now synthesize 60 days of public feedback, which will likely range from high-level theoretical arguments to granular technical complaints from market participants.

The proposing release, now available in the Federal Register, details the specific mechanisms of the transition. The Commission is particularly interested in whether the repeal should be phased in over several quarters to avoid market volatility.

Conclusion

The decision to rescind Rules 611 and 610(e) is a watershed moment for the U.S. capital markets. While the SEC frames this as a necessary evolution to foster innovation and reduce market-wide costs, the potential for unintended consequences remains high. As the comment period opens, the focus will shift from the theoretical benefits of deregulation to the practical realities of implementation.

Will the market become more efficient and transparent as the SEC hopes, or will it lead to the marginalization of smaller investors? The next 60 days of public debate, followed by the Commission’s final ruling, will set the course for the next two decades of American financial history.

The public comment period will remain open for 60 days following the publication of the proposing release in the Federal Register. Interested parties are encouraged to submit their feedback via the SEC’s official portal.