# SEDOL Validator Validate 7-character UK/Irish SEDOL securities identifiers with weighted mod-10 check-digit verification and SEDOL-7 structure breakdown. > Canonical page: https://elysiatools.com/en/tools/sedol-validator - **Category:** Validation - **Keywords:** sedol, lse, uk securities, stock, bond, check digit, nsin ## 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. ## Inputs - **SEDOL Code** (text): 7-character SEDOL. Spaces and dashes are tolerated. ## 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 - Input the 7-character SEDOL code, including any alphanumeric characters, into the validation field. - The tool strips out spaces or dashes and verifies the character length and structure. - It applies the weighted mod-10 algorithm to calculate the expected check digit and compares it against the final character. - The 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. ## Frequently asked questions ### 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. ## Related tools - [CUSIP Validator](https://elysiatools.com/en/tools/cusip-validator): Validate 9-character CUSIP North American securities identifiers with mod-10 check-digit verification, issuer base and issue-number breakdown. - [ICCID Validator](https://elysiatools.com/en/tools/iccid-validator): Validate ICCID numbers for SIM cards with Luhn checksum and issuer analysis - [ISBN Validator](https://elysiatools.com/en/tools/isbn-validator): Validate ISBN-10 and ISBN-13 book number formats with checksum verification - [ISIN Validator](https://elysiatools.com/en/tools/isin-validator): Validate International Securities Identification Numbers (ISO 6166 ISIN) with Luhn check-digit verification, country/issuer prefix and NSIN breakdown. - [Luhn Checksum Calculator](https://elysiatools.com/en/tools/luhn-checksum): Validate or generate numbers using the Luhn algorithm (mod-10). 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