SEC Targets 20-Year-Old Rule Standing in Crypto Trading
The Securities and Exchange Commission unveiled a proposal on June 11, 2026 that would remove a 20-year-old rule tethering Wall Street’s trading framework to a single, national display of quotes. The SEC said it would rescind Rule 611 of Regulation NMS, the so‑called trade‑through rule, and eliminate Rule 610(e), which governs locked and crossed quotes, along with related definitions. The move signals a broad rethinking of market structure that could open doors for tokenized securities and cryptocurrency firms experimenting with blockchain-based trading.
In practical terms, the agency’s plan would push traders, venues, and liquidity providers to rethink how orders are routed and how execution quality is measured when quotes are not displayed in the same way across platforms. But for crypto-focused firms and banks exploring tokenized shares, the proposal targets a specific barrier that has long complicated reconciling blockchain trading with the U.S. large-scale market system.
Rule 611 and 610(e): What they did and why the SEC wants to change them
Rule 611, adopted in 2005 as part of Regulation NMS, was designed to protect investors from trades that occur at worse prices when a better displayed quote exists elsewhere. It linked execution to the NBBO, a snapshot of the best bid and offer across protected venues, and forced traders to honor price improvement opportunities displayed on competing venues. Regulating bodies and market participants built routing, matching, and execution systems around that framework for nearly two decades.
Rule 610(e) addressed a different but related friction: it restricted locked and crossed quotes, aiming to keep prices from becoming stagnant at certain price levels and to minimize cross-venue price anomalies. Taken together, the rules created a coherent, if sometimes rigid, ecosystem for stock trading, with exchanges, brokers, and wholesalers tuning their software to the NBBO-driven world.
Today’s proposal argues that a modern market, especially one that includes tokenized assets and automated market makers, requires flexibility beyond a single display standard. The SEC notes that AMMs—software pools that set prices algorithmically—move value through liquidity curves rather than through static quotes. That fundamental difference makes strict adherence to Rule 611 difficult, if not impossible, to achieve in a fully automated, blockchain-enabled trading environment.
AMMs, DeFi, and tokenized equities in focus
Industry observers say the rule has long been a key obstacle for DeFi-based trading of tokenized stocks. AMMs price trades via bonding curves and liquidity pools, with slippage and block-time execution shaping the final price. In a blockchain context, there is no simple, universally displayed NBBO to anchor routing decisions. As a result, a clean repeal could unlock more scalable ways to trade tokenized equities while challenging traditional price discovery in ways regulation must monitor.
“AMMs don’t operate within a single best-quote framework by design,” said Alex Thorn, head of research at Galaxy Digital. “They price against a curve, and execution happens with a level of slippage that cannot be captured by a conventional NBBO display.” Thorn added that the proposed changes would force both public and private market participants to reengineer risk management around tokenized assets.
Crypto trading desks and banks eyeing tokenized shares have argued that the current framework creates a disconnect between on-chain liquidity and off-chain price discovery. A repeal could encourage interoperability, enabling asset-backed tokens to be traded with different routing methods and potentially lower barriers to entry for new liquidity providers. Still, observers warn the shift could introduce new risks around price discovery, latency, and cross-venue execution quality that regulators will want to monitor closely.
“The SEC’s goal is clarity, not chaos,” said Sophie Patel, chief policy advisor at the Institute for Market Transparency. “If implemented carefully, the proposed changes could reduce fragmentation while preserving essential protections for investors.”
Market structure implications and timeline
- Reported scope: The rule changes would affect how trades route across venues, wholesalers, and crypto-enabled trading pools.
- Public comment period: The SEC has opened a 60-day window for stakeholders to submit feedback on the proposal.
- Implementation timeline: Analysts expect a multi-phase rollout that could extend 12 to 24 months after final approval, depending on comments and potential legislative actions.
- Impact on liquidity: Traders warn that loosening minimum-quote requirements could both widen access to liquidity and complicate short-term price stability in tokenized markets.
The proposal’s timing matters, given a year of intense interest in tokenized assets and the growing presence of on-chain trading venues. Regulators are balancing a push to embrace innovative technology with the need to maintain a coherent national market system. The SEC’s move to target a 20-year-old rule standing reflects a broader willingness to revisit long-standing market rules as the financial landscape evolves toward digital assets.
What investors should watch next
As debate unfolds, investors in traditional equities and crypto-linked assets will be watching several key areas:
- Price discovery dynamics: Will relaxed or reimagined routing improve execution quality or introduce new price-discovery frictions?
- Liquidity access: Will tokenized markets attract broader liquidity providers if the old NBBO constraint is removed?
- Regulatory guardrails: How will regulators ensure that protections against abusive trading and mispricing remain intact?
- Technology standards: Will industry groups converge on new standards for quotes, data feeds, and settlement in a mixed on-chain/off-chain environment?
For market participants, the central question is whether the change will reduce barriers to entry for crypto-native firms while preserving essential safeguards that have long supported orderly markets. The SEC’s plan explicitly states that it intends to preserve price transparency and investor protection, even as it targets a 20-year-old rule standing that some say no longer fits a digitized trading era.
What this means for the crypto ecosystem
Tokenized securities and blockchain trading are no longer fringe experiments. Institutions are allocating significant resources to build interoperable rails between on-chain liquidity and traditional exchanges. If the proposal proceeds, it could accelerate pilots and live pilots for tokenized assets, while forcing crypto brokers to align with a revised framework for trade routing and execution quality.
“From an operational standpoint, a repeal would require robust risk controls, audit trails, and real-time monitoring to ensure that execution quality remains high even as the sourcing of liquidity evolves,” said Maria Lopez, head of regulatory affairs at a major crypto broker. “That’s a tall order, but it’s also the reality of a market that increasingly blends centralized and decentralized liquidity.”
Bottom line
The SEC’s move to dismantle a 20-year-old rule standing between traditional markets and blockchain-enabled trading sets the stage for a major reconfiguration of how orders are routed and executed in the United States. Whether the plan will pass as drafted, endure revisions, or spark new regulatory initiatives remains to be seen in the coming weeks and months. As the comment period unfolds and industry groups weigh in, investors should expect a period of heightened scrutiny and ongoing debate about how best to preserve market integrity in a rapidly digitalizing landscape.
Across Wall Street and the crypto universe, the central questions are clear: Can a modern market structure honor both innovation and investor protection, and how quickly can the U.S. financial system adapt to a world where tokens and smart contracts sit alongside stocks and futures?
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