SEC Moves to Rescind Regulation NMS Rules 611 and 610(e): A Watershed Moment for Equity 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 is formally proposing the rescission of Rules 611 and 610(e) of Regulation NMS. This proposal, if finalized, would dismantle the cornerstone of the modern trading environment—the "Order Protection Rule"—and marks a radical shift toward a market structure governed by competitive forces rather than prescriptive regulatory mandates.
The Core of the Proposal: Dismantling the "Order Protection Rule"
The centerpiece of today’s announcement is the proposed repeal of Rule 611, colloquially known as the Order Protection Rule (OPR). Since its adoption in 2005, the OPR has required trading centers to establish, maintain, and enforce written policies and procedures reasonably designed to prevent "trade-throughs"—the execution of trades at prices inferior to those displayed on another trading center.
By rescinding Rule 611, the Commission is effectively signaling that the technological and economic landscape of 2026 bears little resemblance to the landscape of 2005. The SEC’s proposal also includes the repeal of Rule 610(e), which currently limits the fees that exchanges can charge for accessing their "protected" quotations.
The SEC has invited public comment on this proposal for the next 60 days following its publication in the Federal Register, setting the stage for what is expected to be a contentious and highly technical debate between high-frequency trading firms, retail brokerages, and institutional investors.
Chronology: Two Decades of Market Evolution
To understand the weight of today’s proposal, one must view the history of Regulation NMS through the lens of market fragmentation.
2005: The Birth of Reg NMS
When the SEC adopted Regulation NMS, the objective was to foster a "National Market System" that consolidated fragmented quotes into a cohesive whole. The goal was to ensure that a retail investor’s order would be filled at the best available price across all exchanges. Rule 611 was the engine intended to make this happen, forcing the market to "route" orders to the best price, regardless of where that price originated.
2010–2020: The Era of Complexity
As high-frequency trading (HFT) firms proliferated, the mandate to hunt for the "best price" led to an explosion in market complexity. The proliferation of dark pools, mid-point pegs, and proprietary data feeds created a bifurcated market. While the "National Best Bid and Offer" (NBBO) was protected, the race to reach those prices first became the primary driver of market technology investment, leading to accusations that Reg NMS had inadvertently subsidized latency arbitrage.
2023–2025: The Shift in Regulatory Philosophy
Under the leadership of Chairman Paul S. Atkins, the Commission began a systematic review of the "unintended consequences" of post-2008 financial regulations. The Commission’s staff spent months conducting quantitative analyses on market latency, liquidity fragmentation, and the cost-benefit analysis of the OPR. The findings suggested that the regulatory burden of maintaining compliance with 611 had become a barrier to entry for smaller exchanges and a tax on institutional execution.
June 2026: The Proposal to Rescind
Today’s announcement marks the culmination of this review. The Commission has concluded that the market is now sufficiently robust and transparent that it no longer requires the "training wheels" of the Order Protection Rule.
Supporting Data: Why Now?
The SEC’s proposing release rests on several key data points regarding the current state of equity markets:
- Fragmentation vs. Liquidity: Despite the protection offered by Rule 611, the Commission’s data indicates that liquidity has become increasingly fractured across more than 16 public exchanges and dozens of off-exchange venues. The cost of maintaining compliance with the OPR, the SEC argues, has discouraged the development of innovative alternative trading systems (ATS).
- Latency Arbitrage: The mandate to route to the "best" protected quote has created a technological arms race. Data cited in the proposal suggests that a significant percentage of retail order flow is "sniped" by HFT firms that use the OPR’s routing requirements to their advantage.
- Cost of Compliance: For smaller brokerage firms, the administrative and technical costs associated with "Rule 611-compliant routing" represent a significant percentage of their operating budgets. The SEC estimates that repealing these rules could reduce industry-wide compliance costs by several hundred million dollars annually.
Official Responses: The Chairman’s Perspective
In his opening statement, SEC Chairman Paul S. Atkins emphasized the need for a market-driven approach.
"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 said. "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."
Atkins further addressed critics of the move by framing it as an exercise in regulatory humility. "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 added. The Chairman’s tone suggests that the SEC is prepared for significant pushback from institutional investors who fear that removing the OPR will lead to a "race to the bottom" in execution quality.
Implications for the Market
The potential rescission of these rules has profound implications for every layer of the financial ecosystem.
For Retail Investors
Retail investors, who currently benefit from the "best price" guarantee of the NBBO, may see a shift in how their orders are handled. Without the OPR, brokerages may prioritize speed or execution certainty over the absolute "best" price. However, the SEC posits that increased competition among venues could lead to better-tailored execution services, potentially benefiting retail traders who are currently paying for the overhead of a one-size-fits-all routing mandate.
For Institutional Investors
Asset managers and pension funds, which rely on large-block executions, are likely to be the most vocal critics of the proposal. The OPR provides a legal safety net that prevents them from being "traded through" during large, multi-exchange executions. Without this protection, institutional traders may be forced to rely more heavily on proprietary algorithms and expensive brokerage execution desks to navigate a fragmented landscape.
For Exchanges and Trading Venues
For traditional exchanges, the repeal of Rule 610(e)—which caps access fees—is a potential windfall. If exchanges are no longer restricted in what they can charge to access their liquidity, they may fundamentally change their business models. This could lead to a surge in new exchange-like venues, fostering a more competitive environment for price discovery.
For Fintech and HFT Firms
The HFT community may see their traditional business models challenged. If the OPR is removed, the "protected" status of the NBBO disappears, meaning that the incentive to build the fastest possible route to every exchange may diminish. This could lead to a massive pivot in how HFT firms deploy capital, shifting away from latency-focused strategies toward strategies based on depth of liquidity and market making.
The Road Ahead: A Period of Uncertainty
The 60-day comment period is expected to be one of the most intense in the SEC’s history. The proposal is not merely a change in administrative policy; it is a fundamental shift in the philosophy of the U.S. capital markets.
Advocates for the repeal argue that the market has "grown up." They contend that modern institutional technology is more than capable of finding the best price without a government mandate. Opponents argue that the OPR is the only thing keeping the U.S. markets from descending into a chaotic, "wild west" environment where small investors are routinely disadvantaged by sophisticated market participants.
As the industry prepares its formal responses, one thing is certain: the era of Regulation NMS is drawing to a close. Whether this new chapter brings a more efficient, innovative market or a period of volatility and fractured liquidity remains to be seen. The SEC’s role now is to listen, analyze, and decide whether the market is truly ready to trade on its own merits without the safety net of the last twenty years.
For more information on the proposed amendments and to review the full proposing release, stakeholders are encouraged to visit the SEC’s official website and the Federal Register.
