parse-sedol

Validate and parse SEDOL identifiers. Zero dependencies.

import { parseSEDOL, isValidSEDOL } from 'parse-sedol';

isValidSEDOL('B0YBKJ7');  // true
isValidSEDOL('B0YBKJ0');  // false

parseSEDOL('B0YBKJ7');
// {
//   raw: 'B0YBKJ7',
//   valid: true,
//   code: 'B0YBKJ',
//   checkDigit: '7',
//   computedCheckDigit: '7',
//   isNewFormat: true,
//   isOldFormat: false,
//   isUserAllocated: false,
// }

Install

npm install parse-sedol

API

isValidSEDOL(input: string): boolean

Returns true if the 7-character string is a valid SEDOL with correct check digit.

parseSEDOL(input: string): ParsedSEDOL

Parses a SEDOL into its components. Always returns an object — check result.valid.

| Field | Type | Description | |-------|------|-------------| | raw | string | Original input | | valid | boolean | Whether the check digit matches | | code | string | 6-character base code | | checkDigit | string | Provided check digit (position 7) | | computedCheckDigit | string | What the check digit should be | | isNewFormat | boolean | Starts with letter (post-January 2004) | | isOldFormat | boolean | Starts with digit (pre-2004) | | isUserAllocated | boolean | Starts with 9 (end-user range) |

computeCheckDigit(code: string): string

Compute the check digit for a 6-character SEDOL code. Returns '' for invalid input.

import { computeCheckDigit } from 'parse-sedol';
computeCheckDigit('B0YBKJ');  // '7'

What is a SEDOL?

SEDOL (Stock Exchange Daily Official List) is a 7-character identifier assigned by the London Stock Exchange to securities traded in the UK and Ireland. Every UK ISIN embeds a SEDOL.

• Format: 6 alphanumeric characters + 1 check digit
• Valid characters: Digits 0–9 and consonants B–Z (no vowels)
• Algorithm: Weighted modulus 10 with weights [1, 3, 1, 7, 3, 9]

License

MIT