SEC Signals Seismic Shift: Proposed Rescission of Regulation NMS Rules 610 and 611

WASHINGTON, D.C. — June 11, 2026 — In a move that promises to reshape the bedrock of the American equity markets, the Securities and Exchange Commission (SEC) announced today that it has formally proposed the rescission of Rules 611 and 610(e) of Regulation National Market System (Reg NMS). This decision marks the most significant regulatory pivot in equity trading since the original adoption of the regulation nearly two decades ago.

The proposal, unveiled by SEC Chairman Paul S. Atkins, signals a clear departure from the "Order Protection Rule" era, shifting the Commission’s philosophy toward a market-driven landscape that prioritizes simplicity and reduced regulatory friction over the prescriptive mandates of the mid-2000s.

The Core Proposal: Dismantling the Pillars of Reg NMS

At the heart of the SEC’s announcement is the intent to remove the "Trade-Through Rule" (Rule 611) and the associated restrictions on access fees (Rule 610(e)).

Rule 611 has long required trading centers to establish, maintain, and enforce written policies and procedures reasonably designed to prevent "trade-throughs"—transactions executed at a price inferior to the best-displayed quotation across all markets. While intended to ensure investors received the "best price," critics have long argued that the rule fostered a fragmented market, encouraged high-frequency trading (HFT) latency arbitrage, and created a complex web of "dark pools" and inter-market linkages that actually hindered true price discovery.

"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 during the press conference. "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: A Two-Decade Evolution of Market Structure

To understand the magnitude of this proposal, one must view it against the backdrop of the evolution of U.S. capital markets.

• 2005: The Birth of Reg NMS. The SEC adopted Regulation NMS to modernize the national market system. Its primary goal was to foster competition among individual markets while ensuring that all markets were linked together to protect investors.
• 2007: Full Implementation. The rules went into effect, requiring brokers to route orders to the venue showing the "National Best Bid and Offer" (NBBO). This effectively solidified the dominance of electronic communication networks (ECNs).
• 2010–2015: The Rise of Complexity. As HFT firms optimized for speed to capture the "best price" ahead of others, the market began to complain of "latency arbitrage," where institutional investors were front-run by faster algorithms.
• 2020–2024: The Call for Reform. Industry heavyweights and academic researchers began lobbying for a "de-fragmentation" of the markets, arguing that the protection of the NBBO was creating a mirage of liquidity.
• June 2026: The Paradigm Shift. The SEC officially proposes the rescission, marking the end of the twenty-year experiment in centralized price protection via regulatory mandate.

Supporting Data: The Case for Deregulation

The SEC’s proposal is backed by extensive internal analysis suggesting that the costs of compliance with Rule 611 have begun to outweigh the benefits to retail and institutional investors.

Market Fragmentation

Data cited in the proposing release highlights a significant increase in the number of trading venues since 2005. While this was intended to increase competition, the SEC’s findings suggest it has instead led to "liquidity silos." Because Rule 611 mandates that orders must be routed to the best-displayed price, liquidity providers have been forced to split their quotes across dozens of venues, making it harder for institutional investors to execute large "block" trades without signaling their intent to the broader market.

The Cost of Complexity

The administrative burden of maintaining Rule 611 compliance systems represents a significant percentage of the operating budgets for mid-tier broker-dealers. By rescinding these rules, the SEC estimates a potential reduction in overall market overhead by several billion dollars annually.

Efficiency and Speed

Empirical studies integrated into the proposal show that the speed-race necessitated by the "trade-through" protection has incentivized firms to spend billions on microwave towers and fiber-optic cables, investments that provide no fundamental value to the companies being traded or the long-term shareholders holding those stocks.

Official Responses and Industry Sentiment

The announcement has triggered a wave of reactions across Wall Street, ranging from cautious optimism to existential concern.

The Pro-Reform Perspective

Many buy-side institutions, including large pension funds and mutual funds, have welcomed the news. A spokesperson for a major asset management firm noted, "We have spent years struggling with ‘slippage’ caused by the fragmented nature of the NBBO. Moving toward a system that rewards liquidity provision over speed is a massive win for the end-investor."

The Skeptics

Conversely, certain electronic market makers who have built business models on the current regulatory structure expressed concern. "Removing the protection of the best price could lead to a ‘race to the bottom’ where brokers route orders to the venue that pays the highest rebate, rather than the venue that offers the best execution," warned a representative from an industry trade group.

The Commission’s Stance

Chairman Atkins addressed these concerns directly: "I look forward to reviewing public comments as we take a careful, deliberative approach to avoid repeating the same mistakes that brought us here. We are not moving toward a ‘Wild West’ scenario; we are moving toward a market where the natural incentives of competition—rather than a static regulatory rulebook—define the quality of execution."

Implications: What Happens Next?

The rescission of Rules 610 and 611 will not happen overnight. The SEC has initiated a 60-day public comment period following the publication of the proposal in the Federal Register.

Impact on Retail Investors

Retail investors, who have benefited from "price improvement" provided by wholesalers, may see changes in how their orders are routed. Without the strict requirement to chase the NBBO, broker-dealers may have more flexibility to execute orders in-house or through internal liquidity pools, provided they can prove "best execution" through other metrics.

The Future of Dark Pools

With the removal of the Trade-Through Rule, the incentive to trade in dark pools may shift. If exchanges can compete more effectively on price and liquidity without being hamstrung by the rigid requirements of Reg NMS, we may see a migration of volume back to the lit exchanges.

Technological Shifts

The software that powers modern trading desks will require a significant overhaul. If the rule is rescinded, the algorithms that currently "ping" every venue to ensure the NBBO is respected will become obsolete. This could lead to a decline in the dominance of ultra-high-frequency latency-based strategies.

Conclusion: A New Era for U.S. Equities

The proposed rescission of Rules 611 and 610(e) is a watershed moment. It represents an admission by the primary regulator that the market structure of the early 21st century—designed to protect investors in the infancy of electronic trading—has become a hindrance to the maturity of the 21st-century market.

As the industry prepares for the 60-day comment window, the debate will likely intensify. Market participants, technology providers, and consumer advocates will all be scrutinizing the fine print to determine whether this move will truly foster a more efficient, cost-effective, and competitive marketplace, or if it will expose the system to new, unforeseen risks.

For now, the SEC has set a clear path: the agency is betting that by stripping away the rigid infrastructure of the past, it can unleash a wave of innovation that will ultimately benefit the American investor. Whether that bet pays off remains the most pressing question in the halls of financial regulatory policy.

Interested parties may view the full proposing release and submit comments through the SEC’s official portal. The Commission encourages robust dialogue, particularly regarding the potential impact on liquidity and execution quality for retail market participants.