ISIN

An ISIN is a twelve-character code that identifies one security worldwide, such as US0378331005 for Apple. The first two characters are a country code, the next nine identify the issue, and the last is a check digit. Unlike a ticker symbol, which can be reused on different exchanges and can change when a company renames itself, an ISIN stays attached to the same security.

Why it matters

Tickers are the reason portfolio spreadsheets go wrong quietly. The same three letters can mean one company on one exchange and something else on another, and a fund with a single name often has several versions with different currencies, domiciles and distribution policies behind it. An ISIN removes that ambiguity, which matters most when you are combining files from several brokers that each describe the same holding in their own words.

How BullBenchmark shows it

We match positions on the ISIN in your export, so two brokers holding the same fund merge into one line instead of appearing twice. When a file arrives in a format we do not recognize, you map its columns once, including the identifier column, and that format is recognized from then on. The merged result, five holdings across two brokers, is what the live demo is built from.

Related terms

ETF (Exchange Traded Fund) · Corporate action · Stock split

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