Summary
An International Securities Identification Number, or ISIN, is a 12-character alphanumeric code used to identify a specific financial instrument.
For bonds, the ISIN helps distinguish one issue or tranche from other securities issued by the same organisation.
Why it matters
Bond names can be similar, and a single issuer may have several bonds with different coupons, maturity dates, currencies, or terms. The ISIN provides a standard identifier that can be used to match the correct bond across systems, documents, and market data.
It is particularly useful when searching for official terms, checking a transaction, or comparing information from more than one source.
How to read it
An ISIN should be read and copied exactly as displayed. It contains letters and numbers and ends with a check digit used to help detect transcription errors.
The ISIN is different from a ticker symbol or a local market code. Those identifiers may vary by market or data provider, while the ISIN is intended to identify the instrument itself.
When it may not be available
An ISIN may not be shown when it has not been supplied in the available reference data or when the displayed instrument uses another identifier.
Things to keep in mind
An ISIN identifies a security but does not describe its price, credit quality, liquidity, or investment risk. Investors should still review the bond’s issuer, coupon, maturity, currency, ranking, and official documentation.
When two records have different ISINs, they should be treated as different instruments unless verified otherwise.