SEC Moves to Rescind Regulation NMS Rules 611 and 610(e): A New Era for U.S. Equity Markets

WASHINGTON D.C., June 11, 2026 — In a landmark decision that promises to reshape the architecture of the American financial system, the Securities and Exchange Commission (SEC) today announced a formal proposal to rescind Rules 611 and 610(e) of Regulation National Market System (NMS). This move represents the most significant regulatory pivot in equity market structure in over two decades, signaling a definitive departure from the "Order Protection Rule" era that has governed Wall Street since 2005.

The proposal, unveiled by SEC Chairman Paul S. Atkins, seeks to dismantle the regulatory framework that mandated price priority and restricted the ability of market participants to bypass automated exchanges. As the Commission opens a 60-day window for public commentary, the financial industry finds itself at a crossroads, debating whether this shift will foster a new wave of innovation or invite a return to the fragmented market conditions of the late 1990s.

Main Facts: The End of the "Order Protection" Era

At the core of today’s announcement is the SEC’s intent to remove two pillars of the current regulatory environment:

1. Rule 611 (The Order Protection Rule): Historically, this rule required trading centers to establish, maintain, and enforce policies designed to prevent "trade-throughs"—transactions executed at prices inferior to the best-displayed quotes in the market. By rescinding this, the SEC is effectively ending the government mandate that prioritized the best-quoted price over other factors like speed, liquidity, or certainty of execution.
2. Rule 610(e): This rule limited the fees that exchanges could charge for accessing their quotes. By rescinding this, the SEC is removing the cap on access fees, allowing market forces—rather than regulatory ceilings—to dictate the cost of interacting with various trading venues.

Chairman Atkins framed the decision as a necessary evolution. "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. "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."

Chronology: Two Decades of Regulation NMS

To understand the weight of today’s proposal, one must look back at the origins of Regulation NMS, which was adopted in 2005 to modernize the national market system.

• 2005: The Birth of Reg NMS: Following the collapse of the dot-com bubble and the move toward decimalization, the SEC adopted Regulation NMS to ensure that investors received the best price for their orders across a fractured landscape of exchanges. The Order Protection Rule (Rule 611) became the centerpiece of this effort.
• 2010–2015: The Rise of High-Frequency Trading (HFT): As markets became increasingly electronic, critics argued that Rule 611 actually incentivized HFT firms to build high-speed infrastructure specifically to exploit the "latencies" inherent in the SEC-mandated quote-protection process.
• 2018–2022: Industry Calls for Reform: Institutional investors and broker-dealers began voicing concerns that the complexity of complying with Reg NMS had created a "tick-size" environment that favored speed over fundamental value.
• 2024–2025: Regulatory Review: Under the leadership of Chairman Atkins, the SEC launched a comprehensive review of equity market structure, seeking input from academics, exchange operators, and retail brokerage firms regarding the efficacy of existing NMS rules.
• June 11, 2026: The Proposal to Rescind: The SEC formally proposes the removal of Rules 611 and 610(e), marking the formal conclusion of the Reg NMS era.

Supporting Data: Analyzing the Market Impact

The decision to rescind these rules is backed by a growing body of research suggesting that the market has evolved far beyond the capacity of 2005-era regulations to manage it.

The Latency Arbitrage Problem

Data from the last five years indicates that a significant portion of trading volume is dedicated to "latency arbitrage," where firms leverage nanosecond advantages to front-run institutional orders that are routed across multiple exchanges to satisfy Rule 611. By removing the mandate to protect every single displayed quote, the SEC anticipates that firms will focus on "best execution" rather than "best price on paper."

Fragmented Liquidity

Market data suggests that liquidity has become increasingly fractured across more than a dozen national exchanges and dozens of "dark pools." The SEC’s economic analysis accompanying the proposal suggests that the compliance burden associated with maintaining "protected quotes" has created an artificial barrier to entry for smaller trading venues that might otherwise offer more efficient execution.

Access Fees and Revenue Models

Rule 610(e) was designed to prevent predatory pricing, but it also cemented the "maker-taker" fee model. By removing the cap on access fees, the SEC believes that venues will be forced to compete on the quality of their technology and the liquidity they provide, rather than relying on regulatory-protected fee structures.

Official Responses and Stakeholder Sentiment

The reaction to the proposal has been swift and deeply divided, reflecting the varied interests within the financial ecosystem.

Exchange Operators

Large exchange operators, who have long relied on the steady revenue streams provided by the current regulatory structure, have expressed skepticism. Many argue that removing Rule 611 could lead to a "race to the bottom" where liquidity becomes less transparent. "We are carefully reviewing the proposal," said a spokesperson for a major national exchange. "Our primary concern remains the integrity of the national market and the protection of retail investors."

Institutional Investors

Conversely, many institutional asset managers have welcomed the news. For years, pension funds and mutual funds have complained that Rule 611 forced them to pay for liquidity they didn’t need, resulting in higher transaction costs. "This is a win for the long-term investor," noted an analyst at a leading global investment bank. "It shifts the focus back to the core purpose of the market: the efficient allocation of capital."

The SEC’s Stance

Chairman Atkins emphasized the Commission’s commitment to a "careful, deliberative approach." He stated, "I look forward to reviewing public comments as we take a careful, deliberative approach to avoid repeating the same mistakes that brought us here." The Commission is clearly aware of the risks of market volatility and has hinted at potential safeguards to be implemented during a transition period.

Implications: A New Market Paradigm

The rescission of these rules will likely trigger a massive transformation in how trading technology is built and deployed.

1. Shift Toward "Best Execution"

Broker-dealers will no longer be able to hide behind the "Order Protection" rule to justify their routing logic. Instead, they will be required to demonstrate to clients that they are achieving the best possible outcome based on a holistic assessment of price, speed, and liquidity. This will likely lead to a rise in "smart order routers" that are significantly more sophisticated than those currently in use.

2. Competition Among Trading Venues

Without the guarantee of protected status, exchanges will have to fight harder for order flow. This could lead to a consolidation of liquidity as venues offer more innovative, bespoke services to attract large institutional blocks. It could also lead to the rise of new, niche trading venues that cater to specific types of assets or market participants.

3. Reduced Regulatory Burden

The compliance cost of maintaining Reg NMS is in the hundreds of millions of dollars annually across the industry. Removing these rules will simplify the regulatory handbook, potentially lowering costs for firms—savings that proponents hope will be passed on to the end investor in the form of lower commissions and tighter spreads.

4. Risks of Fragmentation

Critics of the proposal warn that the market could become "darker," with more trading occurring in private venues away from the public eye. There is also the risk that without the Order Protection Rule, retail investors might receive less favorable execution if their orders are routed to venues that do not offer the best available price. The SEC’s forthcoming Federal Register release will likely contain specific provisions aimed at mitigating these risks.

Conclusion: Looking Ahead

The SEC’s proposal to rescind Rules 611 and 610(e) is a bold move that reflects the current administration’s philosophy of deregulation and market-led innovation. By sunsetting the regulatory architecture of 2005, the Commission is betting that the modern market is mature enough to police itself through competition.

The 60-day public comment period will be critical. Market participants, ranging from high-frequency trading firms to retail brokerage apps, will have the opportunity to influence the final wording of the rules. Whether this shift will result in a more efficient, cost-effective market or a period of instability remains to be seen. However, one thing is certain: the era of Reg NMS is ending, and a new, more volatile, and potentially more efficient chapter of U.S. equity market history is about to begin.

The Commission has invited all interested parties to submit their feedback via the SEC portal before the August deadline. The industry now awaits the full technical breakdown of the proposal in the Federal Register, which will serve as the blueprint for the next generation of American finance.