Securities Intelligence

SIX Digital Exchange: The World's First Regulated DLT Securities Exchange

Donovan Vanderbilt · 24 February 2026 · 10 min read

SIX Digital Exchange (SDX) occupies a unique position in global financial markets: it is the world’s first and, as of 2026, only regulated DLT trading facility — an exchange licensed by the Swiss Financial Market Supervisory Authority (FINMA) to issue, trade, and settle DLT securities on a blockchain-based platform. SDX is not a prototype or a regulatory sandbox experiment. It is a live, operational exchange, trading instruments issued by some of the world’s largest financial institutions, settling transactions in a currency backed by the Swiss National Bank. Understanding SDX requires understanding its parent organisation, its regulatory status, its technology architecture, and its role in the global tokenisation of financial markets.

SIX Group: The Institutional Parent

SIX Digital Exchange is a subsidiary of SIX Group AG, which is itself the operator of Switzerland’s core financial market infrastructure. SIX Group is owned by its member banks — the major Swiss and international banks that use its infrastructure — and operates as a market utility rather than a profit-maximising listed company.

The SIX Group portfolio encompasses three core businesses. SIX Swiss Exchange is the primary stock exchange for Swiss equities, including the Swiss blue-chip SMI index companies. SIX Payment Services operates Switzerland’s domestic payment infrastructure and the Worldline card payment network in which SIX Group holds a significant stake. SIX Financial Information is one of the world’s leading providers of financial market data, reference data, and post-trade data services.

SDX was announced in 2018 as SIX Group’s strategic response to the emergence of blockchain-based financial instruments and the anticipated legislative developments in Swiss DLT law. The intent from the outset was not to build a crypto trading platform in the retail sense, but to create institutional-grade infrastructure for the tokenisation of regulated financial assets — bonds, structured products, and eventually equities — under full Swiss regulatory supervision.

FINMA Licence: The DLT Trading Facility

The regulatory category that makes SDX possible — the DLT trading facility — was created by the Swiss DLT Act’s amendment of the Financial Market Infrastructure Act (FinfraG). FINMA issued SDX’s DLT trading facility licence in September 2021, making SDX the first entity in the world to hold such a licence.

The DLT trading facility licence is structurally distinct from a traditional exchange licence and a traditional central securities depository (CSD) licence, and from either type of licence held separately. A DLT trading facility is permitted to combine the functions that, in traditional financial market infrastructure, must be held by separate entities: SDX can both match buy and sell orders in DLT securities and settle those trades by recording the transfer on its blockchain register — without routing the settlement through SIX SIS AG, Switzerland’s traditional CSD.

This functional integration is the regulatory and commercial heart of SDX. In traditional markets, securities trade on an exchange (T+0 matching) and settle through a CSD two business days later (T+2 settlement). The settlement delay is a source of counterparty risk, settlement fails, and operational complexity. SDX collapses this delay: settlement on SDX is atomic — it occurs at the moment of the trade, with irreversible finality written to the blockchain. This is not just operationally efficient; it eliminates an entire category of settlement risk that traditional markets must manage.

FINMA supervises SDX as a financial market infrastructure operator, applying the same rigorous supervisory standards that apply to the Swiss Stock Exchange and to SIX SIS AG. SDX is not a lightly regulated blockchain experiment. It is subject to the full Financial Market Infrastructure Act regulatory framework, with obligations covering market surveillance, participant admission, operational risk management, and regulatory reporting.

Technology Architecture: R3 Corda

SDX is built on R3 Corda, a permissioned blockchain platform developed specifically for financial market infrastructure. The choice of Corda over public blockchain alternatives (Ethereum, Polkadot) reflects the institutional priorities that govern SDX’s design.

Corda is a permissioned blockchain: participation requires admission by the network operator. This enables SDX to enforce participant eligibility requirements consistent with FINMA’s regulatory framework — only licensed financial institutions admitted by SDX can participate as issuers, investors, or market makers. There is no public, permissionless participation.

Corda’s transaction model differs from public blockchains in a critical respect: transactions on Corda are visible only to the parties to each transaction and any other parties designated by those parties (for example, a regulator with supervisory access). This contrasts with public blockchains where all transactions are visible to all participants. In a financial market context, this means that SDX participants’ trading activity is not visible to their competitors — a commercial confidentiality requirement that is non-negotiable for institutional participants.

Corda’s finality model provides immediate, irreversible settlement — the blockchain record of a DLT securities transfer is the legal transfer under the Swiss DLT Act. This means SDX can offer settlement finality that is both technically immediate and legally conclusive under Swiss law — a combination that traditional market infrastructure, with its T+2 settlement cycle and the Hague Convention complexities of cross-border securities transfers, cannot match.

What SDX Does: Primary Issuance and Secondary Trading

SDX’s operational functions span the full lifecycle of a DLT security.

Primary issuance is SDX’s core current function. Issuers — banks, supranational organisations, and other financial institutions — work with SDX to create DLT securities: tokenised bonds, structured products, and other instruments that are native to the SDX blockchain. The issuance process involves creating the DLT security as a Registerwertrecht under the Swiss DLT Act, recording it on the SDX register, and distributing it to initial subscribers. This replaces the traditional new-issue process — involving prospectus filing, settlement through the CSD, and book-entry creation — with a blockchain-native workflow that is faster, cheaper, and produces a legally certain DLT security.

Instruments listed on SDX include tokenised bonds from UBS, Julius Baer, the World Bank, and SIX Group itself. SIX Group’s tokenised bond — issued by the exchange’s own parent company — was a deliberate signal: the operator of Switzerland’s traditional stock exchange was willing to put its own debt onto its blockchain platform. The World Bank’s SDX bond issuance demonstrated that international supranational organisations could access Switzerland’s DLT market infrastructure.

Secondary trading on SDX allows SDX participants to buy and sell already-issued DLT securities. Volume in SDX’s secondary market has grown since the exchange’s launch, but the market remains considerably smaller than the traditional Swiss equity and bond markets. This is expected: DLT securities are still a small fraction of total Swiss financial market issuance, and secondary market liquidity follows primary market volume over time.

Settlement Currency: The Digital Swiss Franc

The settlement of DLT securities transactions on SDX raises an important question: in what currency is settlement effected? In traditional markets, securities settle against central bank money — commercial banks hold accounts at the central bank through which cash legs of securities transactions are settled, ensuring that settlement carries no credit risk.

SDX has worked with the Swiss National Bank on two approaches to DLT securities settlement:

Project Helvetia demonstrated that the SNB could issue a wholesale digital Swiss franc (d-CHF) — a tokenised CBDC — directly onto the SDX platform, enabling DLT securities to settle against central bank money in the same blockchain environment as the securities themselves. Project Helvetia was conducted as a production-environment test, not merely a theoretical exercise. The SNB settled real tokenised bond transactions on SDX using d-CHF, becoming the first central bank in the world to settle tokenised securities with CBDC in a live operational test.

Cash settlement via commercial bank money is SDX’s current operational reality, pending the potential permanent introduction of a wholesale d-CHF. SDX participants settle cash legs through their commercial bank accounts, with the cash transferred through conventional payment rails while the securities leg settles atomically on-chain. This introduces some complexity compared to the fully on-chain settlement that Project Helvetia demonstrated, but it is fully operational and consistent with Swiss law.

SDX Connect: Bridging DLT and Traditional Infrastructure

SDX Connect is SIX Group’s initiative to ensure that SDX can interoperate with Switzerland’s traditional financial market infrastructure — specifically, SIX SIS AG (the traditional CSD) and SIX Swiss Exchange (the traditional stock exchange). The goal is to allow financial institutions to access SDX without requiring them to build entirely separate technology and operational infrastructure for DLT securities.

SDX Connect represents a strategic acknowledgment that the migration from traditional to DLT-based market infrastructure will be gradual. Large financial institutions will not abandon their existing core settlement infrastructure overnight. SDX Connect reduces the integration cost of adding DLT securities capabilities alongside existing traditional securities operations.

Participants and Access: Institutional Only

SDX is an institutional market. Retail participation is not permitted, and SDX’s regulatory framework is designed for professional counterparties who meet FINMA’s financial institution licensing requirements.

The SDX participant roster includes Swiss cantonal and major banks, Swiss private banks, and international banks with Swiss operations. All participants must be admitted by SDX following a due diligence process that satisfies FINMA’s requirements for market infrastructure participant admission. This is consistent with the DLT Act’s approach to DLT securities as financial instruments regulated under existing financial market law — not as a new, deregulated asset class.

SDX’s Significance for Global Tokenisation

SDX matters beyond Switzerland because it is proof that regulated, institutional tokenisation of financial assets works. It is not a whitepaper. It is not a trial. It is an operational exchange, supervised by a G10 financial regulator, settling real transactions, under a permanent statutory framework.

The global tokenisation market — projected by Citi, McKinsey, and Boston Consulting Group to reach between four and sixteen trillion dollars by 2030 — will require infrastructure analogous to what SDX provides: regulated venues for institutional-grade DLT securities, with legally certain transfer mechanisms and settlement finality. SDX is the world’s first such venue. Its operational track record, regulatory framework, and the DLT Act that underlies it form the benchmark against which all subsequent DLT market infrastructure initiatives will be measured.

Donovan Vanderbilt is Editor of ZUG DLT, published by The Vanderbilt Portfolio AG, Zurich. This analysis is for informational purposes only and does not constitute legal or investment advice. See our full Disclaimer.

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About the Author

Donovan Vanderbilt

Founder of The Vanderbilt Portfolio AG, Zurich. Institutional analyst covering Swiss DLT legislation, tokenised securities regulation, enterprise distributed ledger adoption, and the legal infrastructure enabling Switzerland's digital asset economy.

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