WKN Number: Germany's 6-Digit Code for Identifying Securities

Germany runs one of Europe's largest exchange-traded products markets. Thousands of stocks, bonds, warrants, and structured certificates trade on Xetra (Germany's main stock exchange) every day. Each one carries a unique 6-digit code. That code is the WKN.

What is a WKN number?

WKN stands for Wertpapierkennnummer, German for Securities Identification Number. Clearstream Banking has issued these 6-character alphanumeric codes since 1955, making WKN one of the oldest active securities identification systems in Europe.

Unlike international identifiers built for cross-border use, WKN was designed with the German market in mind from the start. It remains the primary identifier German brokers, banks, and exchanges rely on today.

One WKN identifies one security. Deutsche Bank has a separate WKN for its ordinary shares, preference shares, and every bond issue it has ever listed. That granularity is what makes the system work.

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WKN format and structure

WKN codes are 6 characters long: alphanumeric, with no embedded check digit.

Structure breakdown:

• Characters 1-6: Alphanumeric identifier assigned by Clearstream

The first character tells you something about the issuer. German issuers get codes starting with a number (0-9). Foreign securities listed in Germany start with a letter (A-Z). That single character immediately signals whether you're looking at a domestic or foreign instrument.

WKN covers every type of German-listed security: stocks, bonds, funds, warrants, certificates, and structured products. Germany has one of Europe's largest structured product markets, and each instrument gets its own code regardless of type.

Foreign stocks also get a WKN

Any stock admitted to trading on a German exchange receives a WKN from Clearstream, regardless of where it primarily lists. Apple trades on NASDAQ, but it also trades on Xetra. For the German market to settle that trade, it needs a local identifier. Clearstream assigns one. The ISIN stays the same globally. Only the WKN is added for the German context. That is why the first character tells you the origin: a number means the issuer is German, a letter means Clearstream assigned the code to a foreign instrument trading in Germany.

Example WKN breakdown:

• Code: 710000
• Mercedes-Benz Group AG ordinary shares
• Assigned by Clearstream

WKN in the German market

WKN reaches investors in more places than most realise. It appears on every German broker confirmation, every account statement, and every exchange listing on platforms like Xetra and the Frankfurt Stock Exchange.

For retail investors, WKN matters most when trading structured products. Germany's certificate market is one of the world's largest, with millions of individual instruments. Each carries its own WKN, so you can search, filter, and compare them with precision. Ticker symbols often do not exist for these products. WKN is the only reliable way to identify them.

For institutions, WKN underpins settlement. When a trade executes, Clearstream uses WKN to track ownership and ensure the right security transfers between counterparties. Get the WKN wrong and the wrong security settles in the account.

Corporate actions also run on WKN. Dividend payments, rights offerings, and stock splits are all processed against the WKN of the affected security.

WKN vs ISIN

Every German ISIN contains the WKN. That is not a coincidence: German ISINs were built to wrap the WKN inside the global standard.

The formula is straightforward: DE + WKN (zero-padded to 9 digits) + ISIN check digit.

Use WKN to trade within Germany. Use ISIN when trading across borders.

Reading the WKN inside a German ISIN:

For any ISIN starting with DE, characters 3-11 contain the WKN zero-padded to 9 digits.

ISIN: DE0007100000

• Position 1-2: DE (country code)
• Position 3-11: 000710000 (WKN, zero-padded)
• Position 12: 0 (ISIN check digit)

This only applies to German securities. Each country embeds its own national identifier inside the ISIN.

The bottom line

Every German security has a WKN. Your broker uses it to confirm the right security settles in your account. Get it wrong and you could end up holding the wrong share class, the wrong bond maturity, or a structured product you never intended to buy.

Most investors never see WKN in action. But it is on every trade confirmation, every account statement, and every exchange listing. Pair it with the other securities identifier codes used across global markets to see how the full system fits together.

Germany built WKN in 1955. Seventy years later, it still powers every trade on Frankfurt's exchanges. Not every old system earns that kind of staying power.

Frequently Asked Questions

How do I find a stock's WKN number?

German brokers and financial platforms (comdirect, ING, Flatex) display WKN alongside ticker symbols and ISIN codes on every security page, as do our own stock pages. WKN also appears on trade confirmations and account statements. For structured products and certificates with no ticker symbol, WKN is often the only identifier shown.

What is the difference between WKN and a ticker symbol?

Ticker symbols are exchange-specific and can be recycled when a company delists. A ticker that belonged to one company can later be assigned to a completely different one. WKN is permanent: once assigned to a security, it stays with that security for its entire life. WKN also covers instruments that have no ticker at all, including most certificates, warrants, and structured products. For anything beyond plain stocks, WKN is the more reliable identifier.

Why does WKN have no check digit?

WKN dates from 1955, before check-digit validation became standard practice in securities identification. The system was designed for a domestic market where data entry happened through controlled institutional channels with their own error-checking processes. When Germany adopted ISIN, the check digit was added at that layer instead. So validation exists, it just sits in the ISIN wrapper rather than the WKN itself.

Can WKN numbers change?

No. WKN numbers are permanent for the life of the security. Stock splits, dividend payments, name changes, and exchange transfers leave the WKN untouched. The only time a new WKN gets issued is when a merger or restructuring creates a legally new entity. That permanence makes WKN a reliable reference for historical records and long-term reporting.