SEDOL Checker User Guide – Validate UK Securities with Ease

What is a SEDOL Code?

SEDOL (Stock Exchange Daily Official List) is a seven‑character alphanumeric identifier assigned by the London Stock Exchange to securities listed in the UK and Ireland. The first six characters identify the security, and the seventh is a check digit. Letters A–Z map to values 10–35 (vowels are not excluded in practice), and the checksum uses weights (1,3,1,7,3,9) on the first six characters. The weighted sum is taken modulo 10 to produce the check digit (0–9). SEDOL is widely used in global financial data processing.

How to Use This SEDOL Checker

1. Enter a 7‑character alphanumeric code (automatically converted to uppercase).
2. Click “Validate” – the SEDOL Checker will verify the character set, length, and weighted checksum algorithm.
3. View the result instantly.

This tool is completely free and ideal for investors, finance professionals, and data analysts.

Frequently Asked Questions

1. Does a valid SEDOL guarantee the security actually exists?

This SEDOL Checker only validates the format and checksum. A structurally valid code does not confirm that the security is currently listed. You would need to consult the London Stock Exchange or an official database for real‑time existence.

2. Why does my code show as invalid?

Possible reasons: length is not exactly 7; it contains illegal characters (only A–Z and 0–9 are allowed); or the computed check digit does not match the given last digit. For example, for the hypothetical SEDOL B0YQ6J1, the calculation would be: B=11, 0=0, Y=34, Q=26, 6=6, J=19; weighted sum = (1×11)+(3×0)+(1×34)+(7×26)+(3×6)+(9×19) = 11+0+34+182+18+171 = 416; 416 mod 10 = 6, so the correct check digit should be 6 (the example ends with 1, which would fail). Always rely on the official algorithm.

3. Is there any fee to use this tool?

No, it is completely free.

If you have further questions, feel free to reach out. Thank you for using our SEDOL Checker!