Security Token ATS Platform Comparison: tZERO vs. Securitize vs. INX

Three platforms collectively control 83% of all security token secondary market trading volume in the United States — tZERO at 40%, Securitize Markets at 28%, and INX (now INX by Republic following Republic’s $60 million acquisition in April 2025) at 15%, with the remaining 17% distributed across 44 other SEC-registered ATS platforms that support digital securities. The competitive landscape shifted significantly in late 2025 and early 2026: tZERO launched near-24/7 trading (23.5 hours of trading, 12:05 AM to 11:35 PM ET) in December 2025 and co-launched the Agora ATS-to-ATS connector with North Capital in January 2026; Securitize surpassed $4 billion in tokenized AUM and announced a $1.25 billion SPAC merger to go public; and the SEC’s December 11, 2025 no-action letter allowing the DTC to operate tokenization services on permissionless blockchains signals that traditional settlement infrastructure will soon integrate with blockchain-native platforms. Choosing the right platform is a make-or-break decision for security token issuers because it determines investor access, liquidity depth, compliance infrastructure, and ongoing operational costs for the entire life of the token.

Platform Overview

Regulatory Status Deep Dive

tZERO: The Pioneer ATS

tZERO operates as a subsidiary of Mediant (formerly Overstock.com’s blockchain division), holding broker-dealer and ATS registrations with the SEC and FINRA membership. tZERO was the first major platform to achieve operational ATS status for digital securities, launching secondary trading in 2018 with its own tZERO Security Token (TZROP), which was issued under Reg D 506(c) and later qualified under Reg A+.

tZERO’s regulatory position benefits from its first-mover relationship with FINRA and the SEC, having navigated the initial regulatory interpretations around blockchain-based ATS operations. The platform filed its Form ATS-N in compliance with Regulation ATS requirements and undergoes regular FINRA examinations.

Key regulatory distinctions: tZERO does not hold a transfer agent registration, relying instead on partnerships with registered transfer agents for cap table management. This creates a multi-party infrastructure that adds complexity but allows tZERO to focus on its core trading venue functionality.

Securitize: The Vertically Integrated Platform

Securitize holds the most comprehensive set of regulatory registrations in the security token space: broker-dealer, ATS, transfer agent (through Securitize LLC), and investment adviser (pending). This vertical integration allows Securitize to offer end-to-end tokenization services — from token issuance and primary offering management through secondary market trading and ongoing transfer agent obligations.

Securitize received a no-action letter from the SEC regarding its digital transfer agent operations, providing regulatory comfort for its blockchain-based cap table management system. The platform’s DS Protocol (Digital Securities Protocol) is designed to enforce compliance programmatically through smart contracts, supporting automated Rule 144 holding period enforcement and accredited investor verification checks at the point of transfer.

The vertical integration model means issuers working with Securitize have a single counterparty for the entire token lifecycle — a significant operational advantage, though it creates concentration risk and potential conflicts of interest that issuers should evaluate.

INX: The Dual-Registered Exchange

INX distinguishes itself as the only platform holding both ATS and national securities exchange registrations for digital assets. INX Limited completed an approximately $84 million Reg A+ IPO in 2021 — the first SEC-registered security token IPO — and subsequently launched its trading platform with both exchange and ATS capabilities. In April 2025, Republic acquired INX for $60 million, gaining access to the full regulatory structure including broker-dealer, ATS, transfer agent, and money transmitter licenses. On June 17, 2025, INX Securities met with the SEC Crypto Task Force to discuss custody challenges and ATS trading rules for digital securities.

The exchange registration provides INX with unique capabilities that ATS-only platforms lack:

• Authority to establish formal listing standards for security tokens
• Ability to operate as a self-regulatory organization (SRO) for its listed tokens
• Greater visibility and credibility with institutional investors accustomed to exchange-listed securities
• Potential pathway to inclusion in securities indices and ETF eligibility

However, the exchange registration also imposes significantly higher regulatory obligations, including SRO responsibilities, market surveillance requirements, and more extensive FINRA examination obligations.

Trading Infrastructure Comparison

Order Matching and Execution

All three platforms support blockchain-based atomic settlement through delivery-versus-payment (DVP) mechanisms, where the security token and payment are exchanged simultaneously on-chain. This represents a fundamental improvement over traditional T+1 clearing and settlement processes, eliminating counterparty risk and reducing settlement costs.

INX’s 24/7 trading capability for exchange-listed tokens is a notable differentiator, particularly for tokens with international investor bases across multiple time zones. tZERO’s extended trading hours (6am-8pm ET) provide a middle ground between INX’s continuous trading and Securitize’s standard market hours.

Liquidity and Market Making

Market making remains the critical challenge for all security token ATS platforms. With aggregate daily volume of approximately $12 million across all 47 registered ATS platforms, individual token liquidity is often thin:

• The top 10 most liquid security tokens have average daily volume of $200K-$500K
• The median security token trades $5K-$15K per day
• Approximately 30% of listed tokens have fewer than 5 trades per week

tZERO’s higher market share and larger listing base provide it with the deepest aggregate liquidity pool. Securitize’s institutional focus attracts larger average order sizes ($8,500 vs. tZERO’s $3,200 and INX’s $4,100), which can benefit issuers targeting institutional capital. INX’s exchange registration may attract traditional market makers familiar with exchange trading dynamics.

Fee Structure Comparison

Securitize’s higher fees reflect its vertically integrated service model — the all-in cost includes token issuance, transfer agent services, compliance infrastructure, and trading venue access. For issuers comparing total cost of ownership, Securitize’s bundled pricing may be competitive despite higher line-item fees.

INX’s lower trading commissions reflect its exchange-focused strategy to attract trading volume through competitive pricing, a common approach for newer exchanges building market share.

Supported Asset Classes

Securitize’s strength in fund interest tokens reflects its partnerships with traditional asset managers, including BlackRock’s BUIDL tokenized Treasury fund ($1.87 billion AUM, 45% of the tokenized treasuries market as tracked by RWA.xyz), plus institutional partnerships with Apollo, Hamilton Lane, KKR, VanEck, Morgan Stanley, ARK Invest, and BNY. Securitize surpassed $4 billion in total tokenized AUM in 2025 and announced a SPAC merger with Cantor Equity Partners II at a $1.25 billion valuation to go public, becoming the only platform with dual U.S. and EU digital securities licenses. This institutional channel positions Securitize as the preferred platform for institutional-grade tokenization.

tZERO’s dominance in real estate tokens reflects early partnerships with real estate tokenization issuers and the platform’s focus on Reg D offerings that serve accredited investors in alternative real estate investments.

Technology and Blockchain Support

Multi-Chain Strategy

• tZERO supports Ethereum and Tezos, with the Tezos integration reflecting a lower-cost blockchain option for issuers sensitive to gas fees.
• Securitize supports the broadest blockchain ecosystem — Ethereum, Polygon, and Avalanche — providing issuers with flexibility to choose based on transaction costs, settlement speed, and institutional preference.
• INX operates exclusively on Ethereum, prioritizing the largest smart contract ecosystem and its extensive developer tooling.

All platforms implement ERC-1400 or proprietary compliance token standards that enforce transfer restrictions, accredited investor verification, and jurisdictional compliance at the smart contract layer.

Strategic Selection Framework

Choose tZERO when:

• Maximum secondary market liquidity is the primary objective
• The token is a real estate or corporate equity tokenization
• Extended trading hours benefit the investor base
• First-mover regulatory relationships provide comfort
• The issuer prefers to select best-of-breed transfer agent and custody providers separately

Choose Securitize when:

• End-to-end integrated service is preferred (issuance through trading)
• Institutional investors are the primary target audience
• Multi-chain blockchain flexibility is important
• Integrated transfer agent services reduce counterparty complexity
• The tokenization involves fund structures or institutional-grade assets

Choose INX when:

• Exchange registration provides credibility advantages with the target investor base
• 24/7 trading capability is important for international investors
• Lower trading commissions are a competitive factor for attracting volume
• The issuer values the potential for future index inclusion and ETF eligibility
• Lower listing fees align with budget constraints

For Reg D vs. Reg A+ exemption selection that directly impacts platform choice, see our exemption comparison. For ATS market activity data, see our real-time tracker. For secondary market liquidity analysis across all platforms, see our market structure guide.

Emerging Competitors and Market Evolution

While tZERO, Securitize, and INX control the current market, several emerging platforms are positioning for market share:

Prometheum. Prometheum holds the most comprehensive set of digital-native registrations: Prometheum Capital was approved in 2024 as the first SEC-registered Special Purpose Broker-Dealer and Qualified Custodian; Prometheum Ember ATS provides secondary market trading; Prometheum Coinery LLC (registered May 2025) serves as digital transfer agent; and ProFinancial Inc. handles capital formation and distribution. The SPBD framework allows limited custody and trading of digital asset securities without full-service broker-dealer infrastructure, potentially enabling a lower-cost market entry.

Polymath. Polymath operates the Polymesh blockchain, a purpose-built chain for security tokens that integrates compliance at the protocol level. While Polymath’s Polymesh does not itself hold ATS registration, tokens issued on Polymesh are designed to be listed on any ATS platform that supports the Polymesh chain.

Traditional Finance Entrants. Major financial institutions including JPMorgan (Onyx), Goldman Sachs (GS DAP), and DTCC (Project Ion) are developing tokenized securities infrastructure that may eventually compete with or integrate with existing ATS platforms. These institutions bring vast existing client networks, established regulatory relationships, and deep balance sheets for market making — potentially disrupting the current ATS competitive landscape.

Due Diligence Checklist for Platform Selection

Before selecting an ATS platform, security token issuers should evaluate:

1. Regulatory standing: Verify current FINRA membership status and any disciplinary history through FINRA BrokerCheck. Review the platform’s Form ATS-N filing on SEC EDGAR for operational disclosures.
2. Listing pipeline: Request data on the number of tokens currently listed, average daily trading volume per token, and investor onboarding trends.
3. Compliance infrastructure: Confirm that the platform’s smart contracts enforce the specific transfer restrictions required by your offering exemption — whether Rule 144 holding periods, accredited investor checks, or jurisdictional restrictions.
4. Custody arrangements: Understand whether custody is provided in-house (as with Securitize) or through third-party qualified custodians, and evaluate the custody framework against your risk tolerance.
5. Market making commitments: Determine whether the platform provides dedicated market makers for your token and what minimum spread and depth commitments are offered.
6. Total cost of ownership: Calculate the all-in cost over a 3-year period, including listing fees, annual maintenance, trading commissions, transfer agent fees, and investor onboarding costs.
7. Exit provisions: Review the contractual terms for delisting and transferring to a different ATS platform if the initial selection proves unsuitable.

For regulatory filings and ATS transparency data, see FINRA’s ATS Transparency Data and SEC EDGAR ATS-N Filings.