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 a formal proposal to rescind Rules 611 and 610(e) of Regulation National Market System (NMS). This regulatory pivot marks the beginning of the end for the "Order Protection Rule" and the "Access Fee Cap," policies that have served as the bedrock—and, according to critics, the bottleneck—of American stock trading for over two decades.

The proposal, unveiled by SEC Chairman Paul S. Atkins, represents a deliberate departure from the interventionist market structure philosophy that has dominated Washington since 2005. By moving to dismantle these rules, the Commission aims to foster a more decentralized, competitive, and innovation-friendly trading environment.

The Core Proposal: Dismantling the Old Guard

The heart of today’s SEC action is the proposal to rescind two specific, yet highly influential, components of Regulation NMS:

1. Rule 611 (The Order Protection Rule): Historically known as the "Trade-Through Rule," this regulation mandates that trading centers establish policies and procedures to prevent the execution of trades at prices inferior to the best-displayed quotes (the National Best Bid and Offer, or NBBO).
2. Rule 610(e): This rule governs access fees, capping the amount that trading venues can charge participants for accessing their displayed quotes. It was designed to prevent excessive "access fees" from distorting price discovery.

Chairman Atkins framed the proposal as a long-overdue reckoning with the realities of modern, high-speed electronic trading. "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," Atkins stated during the announcement. "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."

A Chronology of Regulation NMS

To understand the weight of this decision, one must look back at the origins of the regulatory framework that is now on the chopping block.

The 2005 Implementation

Regulation NMS was adopted in 2005 to modernize the market. At the time, the SEC sought to consolidate the fragmented U.S. stock market, ensuring that investors received the best price regardless of which exchange held their order. Rule 611 was the crown jewel of this effort, aimed at preventing "trade-throughs"—where an order is filled at a worse price on one exchange while a better price is available elsewhere.

The Era of Fragmentation (2010–2020)

As trading became increasingly digitized, the unintended consequences of the rule began to manifest. While it protected the NBBO, it also led to a proliferation of "dark pools" and high-frequency trading (HFT) strategies that prioritized speed over price transparency. By the mid-2010s, critics argued that the rule had effectively created a "speed trap," where the fastest participants could exploit the latency between market updates.

The Reform Movement (2021–2025)

Following several "flash crashes" and concerns regarding market resiliency, the SEC began a multi-year review of market structure. In 2024, the Commission issued a concept release questioning whether the rigid mandates of the 2005 era were still compatible with decentralized finance and modern algorithmic trading.

June 2026: The Proposal to Rescind

Today’s announcement marks the culmination of that review. By proposing a total rescission, the SEC is essentially conceding that the original 2005 experiment has reached its natural conclusion.

Supporting Data: Why Now?

The SEC’s proposing release, a comprehensive document detailing the rationale for this shift, highlights several key performance indicators that suggested the need for change:

• Market Complexity Metrics: Internal SEC data suggests that the "Order Protection Rule" has contributed to an exponential increase in the number of message traffic, as venues fight for top-of-book status to avoid trade-through violations. This has led to increased latency and systemic fragility.
• Cost Analysis: Studies cited in the release indicate that the cost of compliance for mid-sized broker-dealers has risen by an average of 14% annually since 2018, much of which is attributed to maintaining the complex technology stacks required to comply with Rule 611.
• The "Maker-Taker" Distortion: The release argues that the combination of Rule 611 and 610(e) created a "maker-taker" fee model that incentivized volume over quality of execution, effectively subsidizing liquidity providers at the expense of retail investors.

Official Responses and Industry Sentiment

The announcement has triggered a wave of reactions across the financial services industry, revealing a stark divide between traditional exchanges and newer, technology-driven trading firms.

From the Exchanges

Major national securities exchanges have expressed cautious concern. In a statement released shortly after the SEC’s announcement, a spokesperson for a leading exchange group noted, "While we appreciate the Commission’s desire to reduce complexity, the total removal of price protection mechanisms could lead to a fragmented market where retail investors are disadvantaged by predatory pricing strategies."

From the Fintech and Trading Firms

Conversely, leaders in the algorithmic trading space have hailed the move as a victory for market innovation. "For years, the industry has been shackled by 2005-era logic," said a lead developer at a major liquidity provider. "By rescinding these rules, the SEC is finally acknowledging that the market can govern itself through competition rather than heavy-handed administrative mandates."

The SEC’s Stance

Chairman Atkins remains resolute in the face of these competing interests. "I look forward to reviewing public comments as we take a careful, deliberative approach to avoid repeating the same mistakes that brought us here," he emphasized. The Commission is particularly interested in whether market participants believe that technology—such as distributed ledger solutions—can replace the regulatory oversight previously provided by Rules 611 and 610(e).

Implications: A New Era for Equity Markets

The rescission of these rules, if finalized, would have profound implications for every participant in the U.S. capital markets.

1. Increased Competitive Pressure on Venues

Without the protection of Rule 611, exchanges will no longer be guaranteed a "protected quote." This forces venues to compete on the quality of their execution, the speed of their systems, and the transparency of their fee structures. Exchanges that fail to provide tangible value to traders may see their volume evaporate.

2. The Return of Price Competition

In the absence of a mandated NBBO, the market may see the emergence of multiple, competing price discovery mechanisms. While some fear this could lead to "price silos," proponents argue it will actually lead to more efficient pricing, as firms will be forced to compete to show the best price to attract order flow.

3. Reduced Regulatory Burden

The elimination of the complex technological infrastructure required to monitor and prevent trade-throughs will significantly lower the cost of operations for smaller brokerage firms. This could lower barriers to entry, potentially fostering a more diverse ecosystem of market participants.

4. Risks and Unknowns

Despite the potential benefits, skeptics point to the risk of "information leakage" and the potential for a return to the pre-2005 era of fragmented, disconnected markets. The SEC will face intense pressure during the 60-day comment period to ensure that the transition does not compromise the integrity of the market.

Conclusion: The Path Forward

The SEC’s proposal to rescind Rules 611 and 610(e) is a defining moment for the financial industry. By signaling a transition from state-mandated market protection to a market-led competitive model, the Commission is placing a significant bet on the maturity and efficiency of modern electronic trading systems.

The public comment period is now officially open and will remain so for 60 days following the publication of the proposing release in the Federal Register. As stakeholders across Wall Street, academia, and the technology sector prepare their responses, one thing is certain: the debate over the future of the U.S. equity market has only just begun. The SEC’s ability to navigate this transition will likely define the market structure for the next twenty years, just as the original Regulation NMS defined the last two.