The fight over who controls tokenized U.S. equity markets has moved from abstract policy debate to active regulatory combat. On April 6, 2026, the Blockchain Association filed a formal rebuttal with the SEC's Crypto Task Force opposing Citadel Securities' push to classify blockchain infrastructur...
"Tokenization is not a side conversation about digital assets. It is a conversation about how the next generation of capital markets will function." — Summer Mersinger, CEO, Blockchain Association
The fight over who controls tokenized U.S. equity markets has moved from abstract policy debate to active regulatory combat. On April 6, 2026, the Blockchain Association filed a formal rebuttal with the SEC's Crypto Task Force opposing Citadel Securities' push to classify blockchain infrastructure — validators, smart contracts, non-custodial wallets — as regulated broker-dealers and exchanges. The filing marks the sharpest public confrontation yet between Wall Street's largest market maker and the decentralized finance industry over the structural architecture of tokenized securities markets.
The stakes are material. Tokenized U.S. Treasuries alone reached $13.53 billion as of April 12, 2026, up from $7.3 billion at the end of 2025. The broader tokenized RWA market (excluding stablecoins) crossed $26.4 billion in March 2026, a fourfold increase from $6.6 billion one year prior. SEC Chair Paul Atkins has predicted the U.S. financial system may shift to tokenization "within a couple of years." The question now is not whether tokenized securities markets will exist, but whether they will operate through existing intermediary structures or bypass them.
Citadel Securities, which handles more than 20% of all U.S. equity volume and approximately 35% of retail order flow, has filed two letters with the SEC arguing that DeFi protocols facilitating tokenized equity trading already meet statutory definitions of exchanges and broker-dealers. The Blockchain Association's response, backed by Uniswap founder Hayden Adams and dozens of member organizations, contends that securities laws regulate intermediaries — not neutral infrastructure.
Citadel Securities submitted its initial 13-page letter to the SEC's Crypto Task Force on July 21, 2025, followed by a second filing on December 2, 2025. The firm's core argument: tokenized U.S. equities should face identical regulatory treatment to traditional equity securities — including best execution requirements, fair access mandates, and pre- and post-trade transparency rules.
According to Citadel's filings, decentralized protocols that bring together buyers and sellers in a coordinated manner already meet existing legal definitions of exchanges and broker-dealers. The firm argued that DeFi activities should not receive different regulatory treatment simply because they are implemented through blockchain code.
Citadel recommended the SEC hold additional roundtables and pursue formal rulemaking rather than grant broad exemptive relief. The firm warned that allowing tokenized securities to trade outside existing intermediary structures could "siphon liquidity" from traditional equity markets and create investor confusion.
The firm's market position provides context for its regulatory stance. Citadel Securities posted a record $12.2 billion in trading revenue in 2025, according to Bloomberg. It serves as the largest designated market maker on the New York Stock Exchange. Together with Virtu Financial, the two firms account for more of the overall equity market than the NYSE itself.
The Blockchain Association's April 6 filing directly challenged Citadel's framework. The submission argues that "securities laws regulate individuals engaged in specific activities, not neutral infrastructure itself." Under this reading, validators, autonomous smart contracts, and non-custodial software do not become regulated middlemen simply because they power tokenized market rails.
CEO Summer Mersinger, a former CFTC Commissioner, framed the dispute as analogous to the 1990s transition to electronic trading. "Tokenization is about bringing better technology to the most important capital markets in the world," she stated in the filing.
The Association contends the SEC already possesses adequate regulatory tools — including exemptive relief and iterative regulatory pathways — to support responsible development of tokenized markets without imposing intermediary classifications on infrastructure operators.
Uniswap Labs founder Hayden Adams escalated the rhetoric, accusing Citadel of "weaponizing" the SEC to classify open-source software developers as centralized intermediaries. Adams argued that if regulators accept Citadel's framing, protocol teams, front-end operators, routing wallets, market makers, and potentially DAO participants could face registration, capital requirements, and best execution duties designed for broker-dealers. He criticized Citadel's assertion that DeFi systems cannot provide "fair access" as inconsistent with how traditional market makers actually operate.
The regulatory backdrop has shifted substantially. In January 2026, the SEC launched its innovation exemption framework under Project Crypto, first announced in July 2025. The framework establishes a regulatory sandbox allowing qualified firms to issue and trade tokens for 12 to 36 months without full SEC registration.
Participating firms must meet strict conditions: limits on investor participation, caps on assets under management, defined testing periods, clear risk warnings, and regular reporting to the SEC on performance, risk events, and user complaints. The SEC retains authority to revoke exemptions if companies fail conditions or evidence of investor harm emerges.
SEC Chair Atkins outlined the agency's approach at a December 2025 interview on Fox Business: "The next step is coming with digital assets and digitization, tokenization of the market. It's the way the world will be — maybe not even in ten years, maybe even a lot less time, maybe a couple of years from now."
In February 2026, Atkins stated that an innovation exemption "would be an important step toward facilitating the integration of tokenized securities into our existing financial system, but it would not change the entire financial system overnight." The SEC has adopted the principle that "securities, however represented, remain securities" and that "economic reality trumps labels."
The SEC now recognizes four categories under its digital asset taxonomy: Digital Commodities, Digital Collectibles (NFTs), Digital Tools, and Tokenized Securities.
Citadel's filing can be read as an attempt to narrow the exemption's scope, ensuring that tokenized markets remain channeled through entities subject to existing broker-dealer and exchange registration requirements. The Blockchain Association's response positions the exemption as a pathway that should be expanded, not constrained.
The regulatory dispute is playing out against accelerating market adoption. According to RWA.xyz data, tokenized U.S. Treasuries reached $13.53 billion as of April 12, 2026. This figure has grown roughly 50x since 2024 and added $2.12 billion in the first two months of 2026 alone, outpacing stablecoin growth in absolute terms for the first time.
Market leaders by AUM: Circle's USYC ($2.67 billion), Ondo's combined suite ($2.6 billion), BlackRock's BUIDL ($2.42 billion, managed through Securitize with a $5 million minimum), Franklin Templeton's BENJI ($1.02 billion, $20 minimum investment), and WisdomTree's WTGXX ($861 million).
The broader tokenized RWA market (excluding stablecoins) crossed $26.4 billion in March 2026. McKinsey projects $2 trillion in tokenized assets by 2030, with more aggressive estimates reaching $30 trillion by 2034.
The entry points illustrate the structural tension at the center of the SEC dispute. BlackRock's BUIDL requires $5 million USDC and targets U.S. Qualified Purchasers — a product designed for existing institutional infrastructure. Franklin Templeton's BENJI, at $20 minimum, suggests a retail-accessible model that could operate through permissionless protocols. Whether both models can coexist under a single regulatory framework — or whether one model's compliance requirements effectively exclude the other — is the core policy question.
The dispute is not a simple "crypto versus Wall Street" conflict. Multiple traditional financial institutions — including BlackRock, Franklin Templeton, JPMorgan, and Bank of America — are active participants in tokenized securities markets. The disagreement is narrower: whether blockchain rails are classified as neutral infrastructure (comparable to TCP/IP or SWIFT messaging) or as regulated intermediaries (comparable to exchanges and broker-dealers).
If the SEC adopts Citadel's framework, tokenized equity markets would operate through registered intermediaries. Settlement, price discovery, and custody would remain with entities subject to existing capital, reporting, and compliance requirements. Blockchain would serve as a technology upgrade within existing market structure — faster settlement, better record-keeping — without altering the distribution of control or fee extraction.
If the SEC accepts the Blockchain Association's position, infrastructure operators could facilitate tokenized trading without intermediary registration. Smart contracts could execute settlement. Non-custodial wallets could hold assets. Validators could process transactions. The intermediary layer — and its associated fee structures, information advantages, and regulatory barriers to entry — would thin or disappear for certain market functions.
The economic implications are substantial. Citadel Securities' $12.2 billion in 2025 trading revenue derives in part from its position as a central intermediary in equity markets. Tokenized markets operating through permissionless protocols could reduce or eliminate the market-making spread, payment-for-order-flow economics, and information asymmetries that sustain current revenue models.
The regulatory fight has extended to Capitol Hill. On March 25, 2026, Mersinger testified before the House Financial Services Committee in a hearing titled "Tokenization and the Future of Securities: Modernizing Our Capital Markets."
In her written testimony, Mersinger warned: "If we get the policy right, the United States can lead in building better and more resilient financial markets. If we get it wrong, we will watch that infrastructure develop elsewhere."
The Blockchain Association subsequently launched a dedicated tokenization workstream with dozens of member organizations to shape policy discussions in Washington.
The Citadel-Blockchain Association confrontation at the SEC is a proxy fight over the future architecture of U.S. capital markets. The underlying assets — equities, treasuries, credit — are not in dispute. What is contested is whether the infrastructure layer that processes, settles, and custodies these assets must consist of registered intermediaries or can operate as permissionless technology.
The SEC's resolution of this question will determine whether tokenization functions as a technology upgrade within existing market structure or as a structural transformation of it. With $13.5 billion in tokenized Treasuries, $26.4 billion in tokenized RWAs, and an SEC Chair publicly predicting a multi-year transition, the policy outcome carries direct implications for fee structures, market access, and the distribution of economic value across U.S. securities markets.
The existing report pipeline — from Citadel's July 2025 letter through the Blockchain Association's April 2026 rebuttal — suggests this dispute will intensify as the SEC's innovation exemption framework generates its first real-world test cases. The question of who controls tokenized market infrastructure is no longer theoretical.