The US Securities and Exchange Commission (SEC) has formally proposed the repeal of Rule 611 (the Order Protection Rule) and Rule 610(e) of Regulation NMS. This regulatory shift, highlighted by Galaxy Digital’s Head of Research Alex Thorn, could dismantle one of the most significant legal barriers preventing the integration of traditional equities with decentralized finance (DeFi). By moving away from rigid execution requirements, the commission potentially opens the door for tokenized stocks to trade on blockchain-based platforms.
Overcoming Regulatory Hurdles in DeFi
Established in 2005, Rule 611 has been a cornerstone of the US equity market, requiring trading centers to prevent "trade-throughs"—executions at prices inferior to protected quotations on other exchanges. While intended to ensure fairness, this rule is functionally incompatible with Automated Market Makers (AMMs) and liquidity pools. According to Thorn, these decentralized protocols cannot currently comply with the mandate to scan all protected quotes across the fragmented US market before every transaction.
- Systemic Conflict: AMMs operate via smart contracts that execute based on internal mathematical formulas rather than external exchange data.
- Legal Risks: Under current standards, any liquidity pool hosting tokenized equities would technically operate as an unauthorized trading center.
- Market Fragmentation: Rule 611 was designed for centralized order books, making it a "top obstacle" for on-chain finance.
Transition to Best Execution Standards
The proposed repeal would see Rule 611 replaced by a "best execution" principle. Unlike the rigid technical requirements of Regulation NMS, best execution places the responsibility on brokers to seek the most favorable terms for their clients. This shift focuses on the qualitative outcome of a trade rather than the specific mechanical path taken to achieve it. If implemented, this change would allow blockchain networks and DeFi protocols to facilitate the trading of traditional assets without the constant threat of regulatory non-compliance.
Rule 611 is one of the biggest obstacles to trading tokenized stocks in DeFi. After the repeal, it will be replaced by the "best execution" principle, which applies at the broker level.
The evolution of Regulation NMS represents a pivotal moment for the convergence of traditional finance and the Ethereum or Solana ecosystems, where many tokenization projects are currently in development. By modernizing the definition of price protection, the SEC may provide the legal clarity necessary for institutional-grade tokenized securities to achieve deep liquidity. As the industry awaits the final decision, the focus shifts to how brokers will adapt their compliance frameworks to incorporate decentralized liquidity sources.
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