Citadel Urges SEC to Force DeFi Registration, Warns of a “Shadow” US Equities Market

October 25, 2026 MM Crypto Team

Citadel Tells the SEC That DeFi Needs to Register

One of the largest market makers in the United States has drawn a line in the sand over decentralised finance. Citadel Securities wrote to the Securities and Exchange Commission on Tuesday urging the agency to require certain DeFi protocols and related businesses to register as exchanges and broker-dealers. The firm warned that letting them operate outside the registration regime would hand the country a parallel equities market.

The letter is the latest and pointed example of traditional finance firms taking an combative approach to light-touch crypto regulation. It lands at the moment Washington is deciding how much of the crypto industry should be exempted from the rules that govern everyone else. Citadel’s core argument is simple: if a platform lets people trade securities, it should be regulated as a securities venue, whether the matching engine runs on a server in Chicago or on a smart contract.

What Citadel Actually Asked the SEC to Do

Citadel Securities is one of the biggest market makers in American equities and options, and its letter carries the weight of a firm whose business depends on the integrity of the markets it trades in. The firm asked the SEC to apply the existing registration framework to DeFi protocols and related businesses that perform the functions of exchanges and broker-dealers — matching buyers and sellers, handling customer orders, and facilitating trades in assets that behave like securities.

The distinction matters because DeFi protocols often argue they are merely software: code that runs autonomously, with no company in the middle to register. Citadel’s position is that function should determine treatment, not form. If a protocol does what an exchange does, it should register as an exchange. The letter stops short of demanding that every line of open-source code be licensed, but it draws the circle wide enough to catch the commercial operations on top of DeFi infrastructure — the front-ends, the operators, and the firms that route orders and take fees.

The “Shadow” Equities Market Warning, Explained

The phrase at the centre of the letter — a “shadow” U.S. equity market — deserves unpacking. Tokenisation puts real-world assets, including shares of listed companies, onto a blockchain as tradeable tokens. In principle, a tokenised share could trade around the clock, settle instantly, and be held in a self-custodied wallet. In practice, if those tokens trade on DeFi protocols that no regulator supervises, the result is a second market in the same underlying stocks — one with different rules, different disclosures, and different protections.

Citadel’s warning is that such a parallel market would fragment liquidity. Instead of all buyers and sellers meeting in one deep, transparent pool — which is what makes prices reliable — trading would split across regulated exchanges and unregistered DeFi venues. Fragmented liquidity means wider spreads, thinner order books, and prices that can drift apart between venues. For retail investors, that is a recipe for worse execution.

Tokenised Equities: Why the Timing Matters Now

This debate is not theoretical. Tokenised equities have moved from white papers to live products over the past year, with several platforms offering blockchain-based versions of listed stocks and a growing chorus of crypto firms arguing that tokenisation is the next great market-structure innovation. The technology offers things the current system does not: near-instant settlement instead of the standard one-day cycle, trading outside market hours, and fractional ownership held in a wallet rather than a brokerage account.

But the regulatory question has always been who supervises the venue where those tokens trade. If the answer is nobody, the largest market makers in the world will not be the only ones alarmed. The SEC has historically insisted that the trading of securities requires a registered venue or a valid exemption, and Citadel is asking the agency to hold that line even as the technology changes. The firm’s letter is, in effect, a demand that innovation in market structure not become a back door out of market regulation.

Project Crypto and the Deregulatory Drift

To understand why Citadel wrote this letter now, it helps to understand the direction of travel at the SEC. Chair Paul Atkins is running a campaign dubbed “Project Crypto” that could include exemptions from specific regulatory requirements for crypto firms. The initiative reflects a genuine shift in Washington: after years in which the previous SEC leadership treated most crypto activity as presumptively unlawful, the current commission is trying to write rules that let the industry operate legally in the United States.

That shift is broadly popular in crypto circles, and it has real merit. Clear rules beat enforcement by lawsuit, and a workable registration path is something the industry has asked for for years. But deregulation and exemption are not the same thing as no regulation at all, and Citadel’s letter is an attempt to shape where the new regime draws its lines. The firm is not asking the SEC to ban DeFi or to reverse Project Crypto. It is asking the commission to make sure that the exemptions it grants do not swallow the equities market whole.

The Market Structure Bill and the CFTC Question

The Citadel letter also lands in the middle of a larger legislative fight. Senators are negotiating a crypto market structure bill that would largely hand industry oversight to the Commodity Futures Trading Commission, the regulator that oversees derivatives and commodities markets. The bill is the most consequential piece of crypto legislation ever attempted in the United States, and its final shape will determine which agency supervises which parts of the industry for a generation.

The CFTC handover matters for DeFi because the two agencies have very different cultures. The SEC is a disclosure-and-registration regulator with a deep bench of enforcement tools and a long history of policing securities markets. The CFTC is a smaller agency built around derivatives, with a lighter-touch approach to spot markets. Crypto firms generally prefer the CFTC’s approach, and much of the industry’s lobbying has been aimed at securing it. Citadel’s letter is a counterweight: a reminder that the firms which actually make markets in American equities would rather see securities-like activity stay under securities regulation.

Banks Join the Pushback on Stablecoin Rewards

Citadel is not alone. Banks have also come out against what they see as a loophole in recently passed stablecoin legislation — one that allows issuers to reward stablecoin holders. The banks argue that paying yield on stablecoins could drain bank deposits and lending capacity, pulling money out of the traditional banking system and into crypto-native dollar substitutes. It is a different issue from DeFi registration, but it comes from the same place: traditional finance firms warning that crypto’s regulatory carve-outs have spillover effects on the system they operate in.

Taken together, the two fights sketch a pattern. Traditional finance is no longer content to watch crypto regulation from the sidelines. Banks, market makers, and other incumbents are now actively lobbying against the parts of the new regime they see as threats to their business models and to financial stability. The crypto industry spent years complaining that Washington ignored it; now Washington is listening to both sides, and the incumbents have arrived with arguments, lobbyists, and letters to the SEC.

Why It Matters for DeFi Builders and Traders

For DeFi builders, the Citadel letter is a warning that the regulatory honeymoon may be shorter than hoped. A registration requirement would change the economics of running a protocol: compliance costs, disclosure obligations, capital requirements, and surveillance duties are all expensive, and they are precisely the costs that DeFi’s permissionless model was designed to avoid. Some protocols would adapt; some would move offshore; some would decentralise further in the hope of falling outside any definition of an exchange or broker-dealer. None of those paths is free.

For traders, the stakes are more immediate. If DeFi protocols that handle tokenised equities are forced to register, the user experience changes: identity checks, trading halts, circuit breakers, and the whole apparatus of regulated markets would arrive on platforms that currently offer none of it. That would be a loss for the permissionless ethos, but it would also be a gain for the protections that retail traders take for granted in traditional markets — and the history of crypto suggests that many traders only discover they wanted those protections after they needed them.

What Happens Next

The near-term question is what the SEC does with the letter. Chair Atkins and his staff are in the middle of designing the Project Crypto framework, and Citadel’s arguments will be weighed alongside the industry’s own submissions. The commission could adopt a registration requirement for DeFi protocols that perform exchange functions, or it could carve out a narrower exemption, or it could defer the question to the market structure bill now moving through the Senate. The longer-term question is whether the United States ends up with one equities market or two — and the letter has put that question on the record, in the words of one of the most important firms in American markets.

FAQ

What did Citadel Securities ask the SEC to do? Citadel urged the SEC to require certain DeFi protocols and related businesses to register as exchanges and broker-dealers, arguing that an exemption would create a shadow US equities market.

What is a “shadow” US equities market? It is Citadel’s term for a parallel market in tokenised stocks trading on unregistered DeFi venues, outside the rules on custody, disclosure, surveillance and best execution that govern registered exchanges.

What is Project Crypto? It is SEC Chair Paul Atkins’s deregulatory campaign, which could include exemptions from specific regulatory requirements for crypto firms. Citadel is asking that exemptions not extend to securities-like activity.

What is the crypto market structure bill? It is legislation senators are negotiating that would largely hand crypto industry oversight to the CFTC. Its final shape will decide which agency supervises which parts of the industry.

Why are banks also pushing back? Banks oppose a stablecoin provision that lets issuers reward holders, arguing it could drain bank deposits and lending capacity — another example of traditional finance resisting crypto carve-outs.

Source: BitRss

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