Rule 611 of Regulation NMS: Exploring Potential Changes and Impact (2026)

The world of finance and regulation is a complex web, and today we're diving into a crucial aspect of it: Rule 611 and its impact on market structure.

A Controversial Rule in the Spotlight:

Imagine a scale of 1 to 10, where 10 signifies the urgency to revisit a rule. Rule 611, also known as the order protection or trade-through rule, hovers around 6 or 7. But why does this seemingly innocuous score matter? Well, it's a reflection of the ongoing debate surrounding the regulation of U.S. equity markets.

Here's the catch: the U.S. equity markets are unparalleled in depth and liquidity, making any reform a high-stakes game. And when it comes to Rule 611, the story gets even more intricate. This rule is deeply embedded in a complex web of regulations, meaning any changes to it could have far-reaching consequences.

But here's where it gets controversial: while some argue that Rule 611 is a necessary safeguard, ensuring best execution and fair market practices, others believe it's an outdated relic. The rule was established based on Section 11A of the Securities Exchange Act, added in 1975, which directed the SEC to create a national markets system. This mandate was born out of a time of government intervention and market distrust.

The Great Debate:

The question of whether to repeal, retain, or revise Rule 611 has sparked lively discussions. Some believe that the rule has run its course and may even be causing more harm than good. With off-exchange trading volumes rising and new exchanges replicating existing ones, the market structure seems misaligned. But is Rule 611 to blame?

And this is the part most people miss: the answer lies not just in the rule itself but in the broader context. The U.S. market's uniqueness means lessons from other jurisdictions may not apply, especially regarding best execution and volume thresholds. Any changes to Rule 611 must consider the entire ecosystem of related rules and regulations.

Unraveling the Complexity:

Today's roundtable aims to delve into potential changes, including access fee caps, the prohibition on locked and crossed markets, the fair access rule, and more. But it's not just about what changes to make; it's also about how to implement them. The sequencing of these changes is crucial, and our esteemed panelists will provide insights to help navigate this complex terrain.

As we explore the possibility of revisiting Rule 611, I invite you to consider these questions:
- How can we ensure best execution without being overly prescriptive if Rule 611 is eliminated?
- Are there clarifications needed for best execution practices, regardless of Rule 611's fate?
- What's the ideal revenue allocation model to curb unnecessary exchange proliferation while encouraging innovation?
- Which rules would require amendments if Rule 611 were repealed?
- How should changes to related rules be sequenced in conjunction with Rule 611 revisions?
- Can the SEC's work with tokenization experiments offer insights for Rule 611?

Let's engage in a thought-provoking discussion, and I encourage you to share your opinions in the comments. Remember, the world of finance is ever-evolving, and your insights can shape its future.

Rule 611 of Regulation NMS: Exploring Potential Changes and Impact (2026)

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