SIX Digital Exchange: The World's First Fully Regulated DLT Exchange
SIX Digital Exchange occupies a position in global financial market history that is not yet fully appreciated: it is the world’s first exchange and central securities depository to operate on distributed ledger technology under a full, permanent regulatory licence. Not a pilot. Not a sandbox. Not a proof of concept. A live, FINMA-licenced financial market infrastructure that has settled real transactions, including transactions involving real central bank money issued by the Swiss National Bank. SDX is Switzerland’s most significant bet on the future of financial market infrastructure, and understanding it is essential for any institutional participant in Swiss DLT markets.
Origins and Context: SIX Group’s Institutional Commitment
SIX Group is Switzerland’s financial market infrastructure group — the organisation that operates the SIX Swiss Exchange (equities trading), SIX SIS (securities custody and settlement, Switzerland’s traditional CSD), the Swiss Interbank Clearing payment system, and numerous other critical infrastructure components of the Swiss financial system. SIX Group is owned by approximately 120 Swiss banks, meaning it is a cooperative structure that represents the Swiss banking industry’s collective infrastructure interests.
The decision to build SDX was made at the SIX Group board level in 2017–2018, following an extended evaluation of whether DLT represented genuine infrastructure transformation or merely an experiment. SIX Group concluded that the tokenisation of financial assets was a structural shift, not a trend — and that Switzerland’s position as a global financial centre required that Swiss financial market infrastructure be at the frontier of this shift rather than adapting to it retrospectively.
This institutional commitment translated into a scale of investment that no private company could match: SIX Group’s cumulative investment in SDX is estimated at CHF 400–600 million, making it one of the largest single investments in DLT financial market infrastructure globally. When critics note that SDX’s secondary market volumes are thin, the appropriate context is that SIX Group has committed Swiss banking industry capital equivalent to half a billion Swiss francs to the proposition that tokenised securities markets will become material — and that Switzerland should own that infrastructure.
Regulatory Status: The FINMA DLT Trading Facility Licence
SDX holds a FINMA DLT trading facility licence (DLT-Handelssystem-Bewilligung), granted under Article 73c of Switzerland’s Financial Market Infrastructure Act as amended by the DLT Act in 2021. This licence is globally unique: no other exchange or CSD holds an equivalent licence because no other jurisdiction has enacted equivalent legislation.
The significance of the licence category:
Permanence: unlike regulatory sandbox approvals, exemption regimes, or pilot programmes (including the EU’s DLT Pilot Regime), SDX’s FINMA licence has no expiry date. It is treated under Swiss law as equivalent in permanence to a traditional exchange or CSD licence.
Combined functions: the DLT trading facility licence permits SDX to combine exchange functions (organised trading) with CSD functions (securities creation, primary custody, transfer) in a single entity. Under EU regulation (MiFID II and CSDR), these functions must be separated between distinct entities — making the EU DLT Pilot Regime’s DLT TSS category a specific exemption rather than a permanent structure. Switzerland’s DLT Act made this combination permanent.
FINMA supervision: SDX is supervised by FINMA under the same rigorous framework applied to SIX Swiss Exchange and SIX SIS. This includes ongoing supervision of capital adequacy, operational resilience, cybersecurity, governance, and market integrity — not a lighter regulatory touch appropriate to a pilot.
Technical Architecture: Building the DLT Exchange
SDX’s technical infrastructure was built from the ground up as a DLT-native system, rather than adapting existing exchange or CSD technology. Key architectural elements:
DLT foundation: SDX operates on a permissioned DLT network based on R3’s Corda framework, adapted for SDX’s specific requirements as a regulated financial market infrastructure. Corda was selected over alternative frameworks (Hyperledger Fabric, Ethereum) primarily because of its privacy architecture — in Corda, transaction details are shared only with relevant participants (the parties to a transaction and their direct counterparties), not broadcast to all network nodes. This privacy model is essential for a regulated securities CSD where transaction confidentiality is expected by institutional participants.
Permissioned network governance: SDX’s network is closed — participants must be onboarded, legally contracted, technically integrated, and FINMA-notified before they can access SDX’s systems. This contrasts with public blockchains where anyone can participate. The permissioned model aligns with FINMA’s regulated infrastructure requirements and with institutional participants’ expectations that their counterparties are known, regulated entities.
SDX CSD (Central Securities Depository): the SDX CSD is the registry of record for tokenised securities created on SDX. When a bank issues a Registerwertrecht on SDX, the SDX CSD records it, manages corporate actions (coupon payments, redemptions), and maintains the beneficial ownership register. The SDX CSD is what gives tokenised securities their legal grounding — without the CSD function, a DLT token is merely a technical object; with it, the token is a legally recognised security.
SDX Exchange: the SDX Exchange provides secondary market functionality — an order book for tokenised securities, price discovery, trade matching, and atomic delivery-versus-payment settlement. Settlement of SDX Exchange trades is final and irrevocable upon matching (T+0 atomic settlement), a significant improvement over the T+2 settlement standard in traditional equity markets and the T+1 convention in Swiss bond markets.
SIS–SDX Bridge: SDX is not isolated from traditional Swiss financial infrastructure. A technical bridge connects SDX’s DLT network with SIX SIS (the traditional CSD), allowing securities to be represented simultaneously in both systems during transition periods. This bridge enables a bank to issue a bond in traditional SIS form (for traditional investors) and tokenised SDX form (for digital investors) simultaneously — managing the migration from traditional to tokenised infrastructure incrementally rather than requiring a binary switch.
Key Milestones: From Pilot to Production
2018: World Bank Pilot Bond
Before SDX’s commercial launch, SIX Digital Exchange conducted a proof-of-concept transaction with the World Bank (IBRD) in August 2018: the issuance of a CHF 200 million Kangaroo-structure bond using DLT infrastructure. This transaction — managed by Commonwealth Bank of Australia as arranger — was the first public demonstration that a supranational issuer of unimpeachable credit quality would engage with DLT bond issuance, validating the concept at institutional scale.
2021: FINMA Licence and Commercial Launch
SDX received its FINMA DLT trading facility licence in December 2021 and launched commercially in that month. The first live transactions — corporate bonds and structured notes by Swiss financial institutions — were executed through the SDX CSD, representing the first globally regulated DLT securities transactions.
2022: UBS CHF 375 Million Digital Bond
The single most significant transaction in SDX’s history to date: UBS issued a senior unsecured digital bond with a face value of CHF 375 million in November 2022. This was, at the time, the largest tokenised bond globally. The bond was issued simultaneously in traditional SIS form (for traditional investors) and tokenised SDX form (for digital investors), with both tranches forming a single economic instrument.
The UBS bond established several important precedents: that Switzerland’s largest bank would commit to tokenised issuance at a meaningful scale; that institutional bond investors would subscribe to tokenised bonds in volume; and that SDX’s infrastructure could handle a transaction of this size reliably.
2023: Project Helvetia Phase III — Live CBDC Settlement
Project Helvetia Phase III was SDX’s most significant development since its commercial launch. The Swiss National Bank, SIX Group, and participating commercial banks used real wholesale Swiss franc CBDC — issued by the SNB — to settle real tokenised bond transactions on SDX. Participating banks included UBS, ZKB, Basler Kantonalbank, Commerzbank, Goldman Sachs, Hypothekarbank Lenzburg, and several others.
This milestone resolved what had been the most significant structural question about tokenised securities: settlement finality using central bank money. Commercial bank money settlement (used in most tokenised securities transactions globally) introduces settlement counterparty risk — if the settling commercial bank fails, settlement risk materialises. Central bank money settlement eliminates this risk. Project Helvetia Phase III demonstrated that Swiss franc tokenised securities can be settled with the same credit quality as traditional securities settled via the Swiss National Bank’s payment infrastructure.
No other jurisdiction has demonstrated live CBDC settlement of tokenised securities at comparable scale.
2024 and 2025: Participant Expansion and International Strategy
SDX’s development in 2024 focused on growing its participant roster, improving secondary market protocols, and engaging international issuers. International banks onboarding for specific transactions, and discussions with non-Swiss issuers seeking to access Swiss institutional investor demand, have been the primary commercial development activities.
Participant Roster: The Network That Matters
SDX’s CSD participant roster includes approximately 20–25 institutions as of 2025. This number is modest by traditional CSD standards (Euroclear has 1,500+ participants; SIX SIS has 400+ participants), but the network effect in tokenised securities markets is not yet driven by participant scale — it is driven by transaction quality. SDX participants include:
- UBS and Zürcher Kantonalbank as the two largest domestic participants
- Multiple other Swiss cantonal banks
- Basler Kantonalbank and Raiffeisen as significant domestic institutions
- Commerzbank and Goldman Sachs International as international participants
- SEBA Bank, Sygnum, and Hypothekarbank Lenzburg as specialist digital finance participants
Each participant requires a formal agreement with SDX, technical integration (typically 3–6 months of software development and testing), and FINMA-approved governance of their SDX connectivity. The high integration cost explains why SDX participant growth is methodical — this is not a platform where sign-up takes minutes.
Leadership and Governance
SDX is led by David Newns (Head of SIX Digital Exchange), who reports to SIX Group’s executive board. The SDX governance structure reflects its ownership by SIX Group — a cooperative of Swiss banks — meaning that participant interests are formally represented in SDX’s governance. This cooperative governance model is unusual in the DLT exchange space, where most venues are either shareholder-owned private companies or subsidiaries of listed exchanges.
The cooperative governance provides alignment with Swiss bank participants’ needs but can slow strategic decision-making compared to a purely commercial entity.
The Challenge: Primary Success, Secondary Thin
SDX’s primary market is demonstrably functional — real bonds have been issued, settled, and are sitting in institutional portfolios. The challenge is secondary market liquidity, where SDX has not yet succeeded in generating meaningful trading volumes.
The structural constraints on SDX secondary market development are detailed in ZUG DLT’s SDX Market Activity Tracker. In summary: the combination of hold-to-maturity institutional investor mandates, insufficient participant count for natural counterparty matching, and lack of portfolio management system integration means that SDX secondary market volumes remain immaterial — estimated at CHF 50–100 million quarterly, compared to CHF billions in primary issuances.
SIX Group has articulated multiple strategies to address the liquidity challenge: growing participant count, facilitating more varied issuances to create a diverse securities universe, working with technology vendors to integrate SDX into portfolio management systems, and developing a secondary market market-making programme. Progress is real but measured.
International Strategy: Attracting Non-Swiss Issuers and Global Connectivity
SDX’s international strategy has two dimensions:
Non-Swiss issuers on SDX: attracting supranational institutions (World Bank, EIB), sovereigns, and international corporates to issue tokenised bonds on SDX infrastructure, accessing Swiss institutional investor demand and Swiss franc capital markets. The World Bank’s 2018 pilot demonstrated the model; converting it into a recurring programme is SDX’s primary commercial development.
Cross-border connectivity: exploring interoperability between SDX and other regulated DLT venues. The BIS Innovation Hub’s various cross-border CBDC and securities settlement projects — including Project Jura (cross-border EUR-CHF CBDC settlement) and Meridian (cross-border securities settlement) — provide the conceptual framework. SDX’s participation in these BIS projects positions it as a willing infrastructure partner for cross-border DLT settlement.
Total Investment and Economic Context
SIX Group’s total investment in SDX from inception through 2025 is estimated in the range of CHF 400–600 million. This number is striking: it exceeds the total venture capital raised by all other Swiss DLT companies combined. It represents SIX Group’s — and therefore the Swiss banking industry’s — financial commitment to the proposition that tokenised financial market infrastructure will be material.
The investment is justified by optionality: if tokenised securities markets develop as SDX’s architects believe they will, SDX’s position as Switzerland’s regulated DLT venue creates enormous long-term strategic value for the Swiss financial centre and for SIX Group. If the market develops more slowly or in a different direction, the investment represents a significant write-down. Swiss banking industry appetite for this option is the most concrete evidence that Switzerland’s institutional establishment believes in the DLT transition.
Outlook: The Path to Material Secondary Market Volume
SDX’s trajectory through 2030 will be determined by whether it can bridge from primary issuance success to secondary market depth. The conditions required — 30+ participants, CHF 5+ billion in outstanding tokenised securities, buy-side secondary trading mandates, CBDC settlement at scale — are achievable but require continued investment and market development effort over a 5 to 7-year horizon.
SDX will not be the world’s largest tokenised securities venue — Clearstream and Euroclear’s scale advantages in the EU market are too great for a Swiss national venue to overcome globally. But SDX can be the world’s best Swiss franc tokenised securities infrastructure for the indefinite future, and for Switzerland’s financial centre, that is a genuinely valuable strategic position.
Published by ZUG DLT — Donovan Vanderbilt. zugdlt.com provides independent institutional intelligence on Switzerland’s distributed ledger technology ecosystem.