TS ISO 6166

TS ISO 6166 addresses a uniform identification structure for securities and related financial instruments based on the International Securities Identification Number (ISIN). It describes a common way to distinguish a given security or instrument consistently across markets and jurisdictions, linking the unique identifier with minimum descriptive data for the related instrument.

How the identifier and the descriptive data work together

The standard is not only about a code format; it also frames how that code is associated with the type of security or financial instrument through minimum descriptive information. This matters because financial instruments can differ by issuer, country code, legal form, and market convention, yet still need to be matched unambiguously in custody, trading, settlement, reporting, and reference-data environments. A shared identifier reduces confusion and supports consistent processing.

In general technical terms, ISIN is widely known as a 12-character identifier used to connect national and issuer-related coding practices into a single international reference. The practical value of the standard lies in that harmonised identification model: it supports reliable data exchange for both fungible and non-fungible instruments, helping market participants keep reference data aligned across systems without changing the underlying legal or commercial characteristics of the instrument.

• Provides a uniform identification structure for securities and related financial instruments.
• Combines a unique identification number with minimum descriptive data.
• Applies to both fungible and non-fungible instruments.
• Uses the descriptive-data concept referenced in Appendix B.