Financial centre — SWIFT, SIX and ISO 20022 sese/semt

Switzerland is one of the world's largest financial centres, and behind every banking or exchange operation flow standardised messages. For the newcomer: when a share changes hands or a transfer crosses a border, it is SWIFT and ISO 20022 messages that carry the information. This data backbone is distinct from the commercial invoice — but shares its ISO 20022 grammar.

History — SWIFT, SIC and SIX SIS

From the launch of the SWIFT network in 1977, major Swiss banks were among the first connected. Domestically, SIC (1987, francs) then euroSIC (1999, euros) provided real-time gross settlement. For securities, SIX SIS plays the role of central securities depository (CSD), handling settlement via ISO 20022 messages.

The ISO 20022 migration of payment traffic (2016-2018) then the QR-bill (2020) extended this backbone toward the consumer. On the global interbank side, SWIFT is in turn migrating from MT to MX (ISO 20022) between 2022 and 2025.

text banking-ch-timeline.txt

1977       | SWIFT (interbank cooperative, HQ in La Hulpe, Belgium) goes live
           | with its messaging network; major Swiss banks (UBS, Credit
           | Suisse) are founding/early members.
           |
1987-1999  | SIC (1987, Swiss francs) then euroSIC (1999, euros) — real-time
           | gross settlement (RTGS) systems operated by SIX for the SNB.
           |
2008-2015  | SIX SIS becomes the Swiss central securities depository (CSD)
           | for securities settlement; ISO 20022 sese/semt messages.
           |
2016-2018  | ISO 20022 migration of Swiss payment traffic (see the ISO 20022
           | pioneer page). The QR-bill follows in 2020.
           |
2022-2025  | SWIFT migrates cross-border interbank traffic from MT to MX
           | (ISO 20022). Coexistence until November 2025.

Governance — SWIFT, SIX, SNB, FINMA

Four players structure the centre: SWIFT (the cooperative that publishes the messaging standards and operates the network), SIX (operator of the exchange, the SIC/euroSIC payments and the SIS CSD), the Swiss National Bank (SNB) (oversight of market infrastructures), and FINMA (the Swiss Financial Market Supervisory Authority).

Schema — sese, semt, pacs, camt

ISO 20022 also covers the securities domain, distinct from payments:

sese (Securities Settlement) — settlement instructions (e.g. sese.023).
semt (Securities Management) — securities position and movement statements.
setr / secl — securities trade and clearing.
pacs / camt — on the cash side: interbank clearing (pacs) and account reporting (camt).

xml sese.023-ch-settlement.xml

<?xml version="1.0" encoding="UTF-8"?>
<Document xmlns="urn:iso:std:iso:20022:tech:xsd:sese.023.001.09">
  <SctiesSttlmTxInstr>
    <TxId>SETTL-2026-CH-0098</TxId>
    <SttlmTpAndAddtlParams>
      <SctiesMvmntTp>RECE</SctiesMvmntTp>   <!-- securities receipt -->
      <Pmt>APMT</Pmt>                         <!-- delivery vs payment -->
    </SttlmTpAndAddtlParams>
    <TradDtls>
      <TradDt><Dt><Dt>2026-06-16</Dt></Dt></TradDt>
      <SttlmDt><Dt><Dt>2026-06-18</Dt></Dt></SttlmDt>  <!-- T+2 -->
    </TradDtls>
    <FinInstrmId><ISIN>CH0012032048</ISIN></FinInstrmId> <!-- e.g. Roche -->
    <QtyAndAcctDtls>
      <SttlmQty><Qty><Unit>1000</Unit></Qty></SttlmQty>
      <SfkpgAcct><Id>SIS-CH-44219</Id></SfkpgAcct>
    </QtyAndAcctDtls>
    <SttlmParams><SttlmTxCond><Cd>NOMC</Cd></SttlmTxCond></SttlmParams>
  </SctiesSttlmTxInstr>
</Document>

Cash vs securities vs invoice

Domain	Messages	Key identifier	Infrastructure
Cash (payment)	pain / pacs / camt	IBAN, BIC	SIC / euroSIC (SIX, SNB)
Securities	sese / semt / setr	ISIN	SIX SIS (CSD)
Commercial invoice	UBL / CII / EDIFACT INVOIC	UID/IDE, GLN	Provider networks / PEPPOL

Adoption — a global hub

Global banks: UBS (which absorbed Credit Suisse in 2023) and the cantonal/private banks operate SWIFT and SIX intensively.
Securities: SIX SIS settles considerable securities volumes in ISO 20022 sese/semt, T+2 cycle.
Cash: SIC/euroSIC process domestic RTGS payments in CHF and EUR.
ISO 20022 head start: the Swiss centre approaches the 2022-2025 SWIFT MX migration with an already-proven backbone.

Common pitfalls

Confusing securities and payment domains. sese/semt (securities, ISIN) ≠ pain/pacs (cash, IBAN); these are distinct ISO 20022 families.
Hunting for the invoice in a banking flow. Commercial detail (lines, VAT) is not in a SWIFT/ISO 20022 payment message.
Forgetting the settlement cycle. Securities settlement follows a cycle (T+2); an inconsistent settlement date fails the sese instruction.
Wrong agent BIC. An incorrect BIC routes the payment to the wrong institution or the wrong system (SIC vs euroSIC).

Foundations

Standards

Flagship messages

Tools