Alternative Trading System Registration for Security Tokens

As of Q1 2026, approximately two dozen firms have FINRA-approved digital asset business lines, with approximately two dozen more applications pending according to FINRA’s ATS equity firms list. The ATS landscape has been transformed by two 2025-2026 developments: tZERO and North Capital’s January 2026 launch of Agora — the first technology network connecting ATSs for broader tokenized securities access — and the SEC’s December 2025 landmark no-action letter allowing the Depository Trust Company (DTC) to operate tokenization services on permissionless blockchains, with a pilot planned for H1 2026 and public launch in H2 2026. ATS registration under Regulation ATS provides the primary regulatory pathway for platforms seeking to operate secondary markets for security tokens — a framework that enables trading without the full burdens of national securities exchange registration under Section 6 of the Exchange Act. The distinction between operating as an ATS versus a national securities exchange is fundamental: ATSs avoid the self-regulatory obligations, governance requirements, and listing standards that apply to exchanges, while accepting limitations on market share (ATSs exceeding 5% of volume in any NMS security face additional obligations) and operating under FINRA oversight through their broker-dealer operator.

Regulatory Foundation

Regulation ATS, adopted in 1998, created a category of trading venue that could match orders in securities without registering as a national securities exchange. An ATS must register as a broker-dealer with the SEC and become a member of FINRA, then file Form ATS (or, since 2019, Form ATS-N for NMS stock ATSs) with the SEC.

For security token platforms, the ATS framework provides critical advantages:

Reduced regulatory burden. Compared to full exchange registration, ATS registration requires significantly less organizational infrastructure, lower capital requirements, and fewer governance obligations.

Operational flexibility. ATSs have greater latitude in setting trading rules, fee structures, and participant requirements than national securities exchanges, which must file rule changes with the SEC.

Speed to market. ATS registration can be completed in 3-6 months, compared to 12-24+ months for exchange registration.

Form ATS-N Filing

Form ATS-N, required since 2019 for ATSs trading NMS stocks and extended to all ATSs through subsequent guidance, requires extensive disclosure about the ATS’s operations, including:

• Subscribers and access. Who can access the ATS, subscriber qualification requirements, and any access limitations.
• Order types and matching. The types of orders accepted, the matching algorithm, and priority rules.
• Fees. All fees charged to subscribers, including trading fees, data fees, and connectivity charges.
• Conflicts of interest. Relationships between the ATS operator, its affiliates, and subscribers that could create conflicts.
• Operational controls. System safeguards, business continuity plans, and cybersecurity measures.

For security token ATSs, the filing must also address blockchain-specific operational characteristics: the smart contract architecture for trade execution, the settlement mechanism (whether atomic on-chain settlement or traditional T+2), the custody arrangement for tokens held in the ATS, and the compliance infrastructure for enforcing transfer restrictions.

Key ATS Platforms for Security Tokens

tZERO ATS

tZERO operates the largest security token ATS by trading volume, processing an estimated $1.8 billion in secondary market transactions in 2025. The platform supports both Reg D and Reg A+ tokens, with integrated accredited investor verification and Rule 144 compliance.

Securitize Markets

Securitize operates an ATS through its Securitize Markets subsidiary, providing secondary trading for tokens issued on the Securitize platform. The vertical integration of issuance, transfer agent, and trading functions creates operational efficiencies but also potential conflicts that must be disclosed on Form ATS-N.

INX Securities

INX operates a registered ATS and has also received approval to operate as a registered securities exchange — the first platform to hold both ATS and exchange registrations for digital securities.

Compliance Requirements

Fair Access (Rule 301(b)(5))

ATSs that meet certain volume thresholds (5% of trading volume in any covered security during four of the preceding six months) must provide fair access to their systems. While no security token ATS has yet triggered the fair access threshold, growing trading volumes make this requirement increasingly relevant.

System Capacity and Integrity (Rule 301(b)(6))

ATSs must establish adequate capacity, integrity, and security for their systems. For blockchain-based ATSs, this extends to smart contract security, node infrastructure reliability, and the ability to handle peak trading volumes without network congestion affecting execution quality.

FINRA Membership

All ATS operators must be registered broker-dealers and FINRA members. FINRA’s examination program includes specific focus areas for digital asset ATSs, including cybersecurity, anti-money laundering compliance, and Reg BI obligations.

Emerging Developments

The SEC’s Crypto Task Force has signaled interest in modernizing the ATS framework for digital assets. Potential reforms include:

• Streamlined Form ATS-N requirements for security token ATSs.
• Modified fair access thresholds reflecting the smaller scale of security token markets.
• Recognition of blockchain-native settlement as satisfying clearing and settlement obligations.
• Cross-platform interoperability standards enabling security token portability.

ATS vs. National Securities Exchange Registration

Security token platforms face a fundamental structural choice: register as an ATS or as a national securities exchange under Section 3(a)(1) of the Exchange Act. The tradeoffs are significant:

INX is the only platform currently holding both registrations, providing a natural experiment in the relative advantages. For most security token issuers, the ATS pathway remains more practical and cost-effective.

The ATS Registration Process

Step-by-step, the ATS registration process proceeds as follows:

Step 1: Broker-dealer registration (3-6 months). File Form BD with FINRA’s Registration and Disclosure program. The application requires disclosure of ownership, management, financial condition, and business activities. FINRA staff reviews the application and may request supplemental information.

Step 2: FINRA membership application (concurrent with Step 1). The broker-dealer applicant must apply for FINRA membership under FINRA Rule 1010. The membership application involves a detailed review of the firm’s business plan, supervisory structure, compliance systems, financial projections, and key personnel qualifications.

Step 3: Form ATS or ATS-N filing (after broker-dealer registration). File Form ATS-N with the SEC at least 20 days before commencing operations. The form becomes immediately effective upon filing (unlike exchange registration, which requires affirmative SEC approval), though the SEC staff reviews the filing and may request amendments.

Step 4: State registrations. Some states require independent registration or notice filings for ATS operations. While Reg D and Reg A+ Tier 2 offerings benefit from federal preemption of state Blue Sky laws, the ATS operator itself may need state-level registrations.

Step 5: Operational launch. Begin operations subject to ongoing FINRA examination, SEC oversight, and the ATS’s own compliance infrastructure.

Ongoing Compliance Obligations

Operating an ATS for security tokens requires ongoing compliance with multiple overlapping regulatory frameworks:

Quarterly reporting. ATSs must file Form ATS-R quarterly, reporting aggregate transaction volume, subscriber count, and operational statistics. This data feeds into FINRA’s ATS transparency publications and our ATS market activity tracker.

Record-keeping (Rule 302). ATSs must preserve records of all orders received, all transactions executed, and the identity of all subscribers. For blockchain-based ATSs, this includes maintaining off-chain records of all on-chain transactions, wallet addresses associated with verified subscribers, and smart contract execution logs.

Confidentiality (Rule 301(b)(10)). ATSs must establish adequate safeguards for the confidentiality of subscriber trading information. This includes cybersecurity measures for blockchain node infrastructure, wallet key management systems, and API access controls.

Amendments. Any material change to the ATS’s operations — including changes to the matching algorithm, fee structure, blockchain network, or smart contract architecture — requires filing a Form ATS-N amendment with the SEC at least 20 days before implementation.

FINRA examinations. FINRA conducts periodic examinations of ATS operators, focusing on compliance with FINRA rules, anti-money laundering programs, customer protection, net capital requirements, and supervisory systems. Digital asset ATSs face additional examination focus areas including blockchain operations, smart contract security, and custody arrangements.

Smart Contract Architecture for ATS Compliance

Security token ATSs implement compliance through smart contracts that enforce regulatory requirements at the transaction level:

Transfer restriction enforcement. Smart contracts check Rule 144 holding periods, accredited investor status, jurisdictional eligibility, and maximum holder limits before allowing any token transfer. Non-compliant transfers are automatically rejected at the smart contract level.

Audit trail generation. Every transaction is recorded on the blockchain, creating an immutable audit trail that FINRA and SEC examiners can access during regulatory examinations. This on-chain record supplements the traditional books and records maintained by the ATS.

Automated compliance updates. When compliance rules change — for example, when a Reg D token’s Rule 144 holding period expires — the smart contract can be updated to reflect the new transfer permissions without manual intervention.

ATS Registration Cost and Timeline

The total cost and timeline for ATS registration varies based on the platform’s complexity and regulatory history:

These costs represent a significant barrier to entry that has concentrated the security token ATS market among a small number of well-capitalized operators. The SEC Crypto Task Force has discussed potential streamlining of the ATS registration process for digital asset platforms, though no concrete proposals have emerged.

ATS Deregistration and Cessation

ATS operators that cease operations must file a Form ATS notice of cessation at least 20 calendar days before stopping ATS functions. The cessation process requires:

1. Notification to all subscribers and listed token issuers
2. Orderly wind-down of open orders and pending settlements
3. Coordination with transfer agents to ensure ownership records are preserved
4. Final reconciliation of on-chain records with the custody provider
5. FINRA notification and final examination

Several ATS platforms have ceased digital asset operations since 2020, including platforms that pivoted away from security tokens due to insufficient trading volume or regulatory costs. The concentration of security token trading volume among tZERO, Securitize, and INX reflects the economic reality that ATS operation requires substantial ongoing investment in compliance infrastructure, technology maintenance, and regulatory examination readiness.

For security token platforms, cessation raises particular concerns about what happens to tokens listed on the deregistering ATS. Unlike traditional securities (which can transfer to other trading venues), security tokens with platform-specific smart contract integrations may face compatibility challenges when migrating to a new ATS. Interoperability standards like ERC-3643 and ERC-1400 mitigate this risk by providing standardized compliance interfaces that facilitate cross-platform migration.

For issuers evaluating ATS listing strategies, the choice of platform affects secondary market liquidity, investor access, and compliance infrastructure. Our entity profiles provide detailed analysis of each major platform’s capabilities and regulatory status. For comparison of ATS vs. exchange models, see our analysis of tZERO’s ATS approach vs. INX’s exchange registration. For the Howey test analysis determining which tokens require ATS infrastructure, see our regulatory framework. For the Reg D vs. Reg A+ comparison affecting ATS investor access, see our analysis. For the SEC’s official Regulation ATS rules, see SEC Regulation ATS.