Key Takeaways:
- SEC proposes removing SEC Rule 611 from the 2005 Regulation NMS framework
- The rule requires trades to follow the national best bid and offer pricing
- 60-day public comment period begins after Federal Register publication
The US Securities and Exchange Commission has proposed removing Rule 611 and 610(e) from Regulation NMS, marking a potential shift in how equity trades are executed across US markets.
Proposed changes to core market rules
SEC Rule 611, introduced in 2005, is widely known as the Order Protection Rule. It requires trading venues such as stock exchanges and broker-dealers to prevent trade-throughs. This means that trades must not be executed at a price worse than the best available price on another exchange.
In practice, this rule ensures that every transaction in a national market system stock follows the national best bid and offer. The mechanism has played a central role in maintaining price consistency across multiple trading platforms.
The SEC has also proposed removing Rule 610(e), which deals with locking and crossing quotations. These conditions occur when bid and ask prices overlap or match across exchanges, affecting how orders are displayed and executed.
Together, these rules have defined how orders move across the US equity market for nearly two decades. Their removal would represent a structural change in market operations and execution logic.
A 60-day public comment period will follow once the proposal is published in the Federal Register. This phase allows market participants to review and respond to the proposed changes before any final decision is made.
Market structure and trading impact
The SEC stated that the proposal aims to simplify market structure and reduce operational costs for participants. It also aims to allow competition and innovation to play a larger role in shaping how equity markets function.
SEC Rule 611 has long ensured that liquidity is accessed across venues to achieve the best available price. Without it, trading venues may gain more flexibility in how they route and execute orders.
At the same time, removing Rule 610(e) could change how price quotes interact across exchanges. This may influence order matching and visibility in real-time trading environments.
Industry observers note that these rules have also influenced how new trading models interact with traditional markets. The requirement to follow national pricing benchmarks has shaped system design and execution strategies across platforms.
The proposal comes at a time when market infrastructure continues to evolve with new technologies and trading methods. Adjustments to foundational rules may influence how participants approach execution, pricing, and liquidity management.
The SEC indicated that it will review feedback during the comment period before making further decisions. Any final outcome will determine whether these long-standing rules remain part of the regulatory framework or are removed to support a different market structure approach.
