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ISIN, WKN and Ticker: Understanding Securities Identifiers

Beginner

Kurz erklärtThe ISIN identifies a security uniquely anywhere in the world, the WKN is the German short code, and the ticker is the abbreviation used at a particular stock exchange. When placing an order, the ISIN is the most reliable reference.

Definition

One and the same share can be traded on several exchanges under different abbreviations. Standardised identifiers exist to prevent any mix-ups.

The three identifiers compared

The ISIN (International Securities Identification Number) consists of twelve characters and begins with the issuer's country code — it is internationally unique. The WKN is a six-character German identification number that continues to exist alongside it. The ticker is the trading abbreviation used at a specific exchange and can differ from one venue to another.

Why the ISIN is the definitive reference

Tickers are not unique: the same abbreviation can refer to different companies on different exchanges. Anyone placing an order should verify the ISIN — especially with foreign smaller stocks that have a secondary listing in Germany.

Watch out for suffixes

Abbreviations with letters appended often do not represent the ordinary share (Stammaktie) but rather warrants, subscription rights, or depositary receipts. These instruments carry a completely different risk profile from the underlying share.

Common mistakes

Placing an order based solely on the ticker.
Mistaking warrants or subscription rights for the ordinary share.
Assuming that a secondary listing in Germany offers the same liquidity as the home market.

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Educational content only, not investment advice. Small caps are highly speculative and total loss is possible. All information without warranty.