ETF základy
ISIN, Ticker, and WKN: How to Navigate ETF Identifiers
Key takeaways
- ISIN is a 12-character international code that uniquely identifies a security worldwide — always use it for reliable searches.
- The ticker is an exchange abbreviation (3–5 letters) that can differ depending on which exchange you are trading the ETF on.
- WKN is a German 6-character code — you will mainly see it on German platforms and with German brokers.
- One and the same ETF can have different tickers on different exchanges, but the ISIN is always the same.
- When entering an order with a broker, always use the ISIN rather than the ticker to avoid mix-ups.
ISIN (International Securities Identification Number) is an international 12-character identifier that uniquely identifies a security worldwide — it is the "birth certificate" of every ETF, stock, or bond.
ISIN: the only reliable identifier
An ISIN has the format: two-letter country code + 10 alphanumeric characters. Example: an ISIN starting with IE indicates Irish domicile — the most favorable choice for a Czech investor from a tax perspective (more in the article on UCITS ETFs with Irish domicile). A fund's ISIN does not change regardless of where you trade it.
Ticker: an abbreviation that depends on the exchange
The ticker is an exchange abbreviation, typically 3–5 letters (e.g. IWDA, CSPX, VWCE). The problem: the same ETF can have a different ticker on different exchanges. The iShares Core MSCI World fund has the ticker IWDA on the London Stock Exchange but a different one on Frankfurt's XETRA. If you submit an order based solely on a ticker, you risk trading a different fund or a different currency class.
WKN: the German system
WKN (Wertpapierkennnummer) is a 6-character German identifier. You will encounter it on German brokers (Flatex, Trade Republic) or financial portals. It works reliably within the German-speaking context, but is not used internationally.
How to search for and enter ETF orders correctly
- When searching for an ETF always start with the ISIN — a search on JustETF or the provider's website returns exactly one result.
- When entering an order with a broker, prefer ISIN over the ticker to avoid confusion.
- If you see a ticker without an ISIN, verify that you are trading on the correct exchange and the correct fund class (accumulating/distributing, EUR/USD).
Where do I find a fund's ISIN?
On the provider's website (iShares, Vanguard, Xtrackers), on JustETF, or in the KIID document. Once you have found the ISIN, save it and enter it directly in your broker's search next time. For the full ETF selection process, the pre-purchase checklist will guide you step by step.
This article is educational in nature and does not constitute investment advice.
FAQ
What is an ISIN code?
An international 12-character identifier for a security — a combination of a country code and digits. An ISIN is globally unique: one code = one fund regardless of the exchange or platform. Every UCITS ETF has its own ISIN.
Why does the ticker differ across exchanges?
A ticker is an exchange abbreviation assigned by each exchange separately. The same ETF may have a different ticker on the London Stock Exchange than on Frankfurt's Xetra. That is why you should always use the ISIN for reliable identification.
What is a WKN?
A German 6-character securities identifier (Wertpapierkennnummer). It is used by German exchanges and brokers (Trade Republic, Flatex). Outside Germany it is not used — in an international context, ISIN is the more reliable choice.
How do I know I am trading the correct ETF class?
Verify the ISIN and look at the fund name — an accumulating class usually has "Acc" or "C" in the name, a distributing class "Dist" or "D". Different currency classes (EUR hedged, USD) have different ISINs.