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Validation

SEDOL Validator

· Last updated：2026-06-23

Validate 7-character UK/Irish SEDOL securities identifiers with weighted mod-10 check-digit verification and SEDOL-7 structure breakdown.

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Written by the Elysia Tools team
Check Digit8

Tool usage guide

Learn when to use this tool, what it supports, and how real users apply it.

Key facts

Category
Validation
Input types
text
Output type
text
Sample coverage
4
API ready
Yes

Overview

The SEDOL Validator is a dedicated utility designed to verify 7-character Stock Exchange Daily Official List (SEDOL) identifiers used in the UK and Ireland. By performing a weighted mod-10 check-digit verification and breaking down the SEDOL-7 structure, this tool ensures your financial security codes are syntactically correct and valid for trade processing.

When to use

  • When auditing UK or Irish financial portfolios to ensure all security identifiers are valid and free of typographical errors.
  • Before submitting trade orders or settlement instructions to prevent transaction failures caused by invalid SEDOL codes.
  • During database migrations or data cleansing operations involving London Stock Exchange (LSE) listed instruments.

How it works

  1. 1Input the 7-character SEDOL code, including any alphanumeric characters, into the validation field.
  2. 2The tool strips out spaces or dashes and verifies the character length and structure.
  3. 3It applies the weighted mod-10 algorithm to calculate the expected check digit and compares it against the final character.
  4. 4The validator outputs the validation status along with a structural breakdown of the identifier.

Use cases

  • Verifying SEDOL codes extracted from financial reports before importing them into portfolio management systems.
  • Troubleshooting failed trade settlements by checking the mathematical validity of the associated security identifier.
  • Assisting data analysts in validating reference data for UK and Irish equities, bonds, and investment trusts.

Examples

1. Validating a British Petroleum (BP) SEDOL Code

Portfolio Administrator

Background

A portfolio administrator needs to verify a list of UK equities before running a reconciliation report, starting with BP's identifier.

Problem

Confirming that the SEDOL code '0263494' is structurally valid and has a correct check digit.

How to use

Enter '0263494' into the SEDOL Code input field and run the validator.

Outcome

The tool confirms the code is valid, showing the weighted mod-10 calculation and verifying that the check digit is 4.

2. Checking an Alphanumeric Barclays SEDOL Code

Compliance Officer

Background

A compliance officer is reviewing trade logs containing alphanumeric SEDOL codes and wants to ensure they are formatted correctly.

Problem

Verifying the validity of the alphanumeric SEDOL code 'B02C3W3' which contains letters.

How to use

Input 'B02C3W3' into the validator and check the output.

Outcome

The tool validates the alphanumeric structure, calculates the weighted sum, and confirms the check digit is 3.

FAQ

What is a SEDOL code?

A SEDOL (Stock Exchange Daily Official List) is a 7-character alphanumeric identifier assigned to securities traded on the London Stock Exchange and other UK/Irish markets.

How does the weighted mod-10 check-digit verification work?

Each of the first 6 characters is assigned a specific weight. The sum of the weighted values is calculated, and the check digit (7th character) is determined by finding what number makes the total sum divisible by 10.

Can this validator handle SEDOL codes with letters?

Yes, the tool supports both older numeric-only SEDOLs and newer alphanumeric SEDOLs introduced after 2004.

Do I need to remove spaces or dashes before validating?

No, the validator automatically tolerates and strips spaces and dashes during the validation process.

Does a valid check digit guarantee the security exists?

No, validation only confirms the code is mathematically correct and structurally valid; it does not check active exchange listings.

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