CUSIP Validator

CUSIP Validator | Elysia Tools

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 CUSIP Validator is a dedicated utility designed to verify 9-character North American securities identifiers. It performs mod-10 check-digit verification and breaks down the identifier into its constituent parts, including the issuer base and issue number, ensuring your financial data is accurate and compliant.

When to use

When auditing financial records containing North American stocks or bonds to ensure CUSIP codes are valid.
Before uploading securities data into portfolio management systems or trading platforms.
When troubleshooting failed transactions or clearing errors caused by potentially mistyped securities identifiers.

How it works

1Enter the 9-character CUSIP code into the input field, with or without spaces and dashes.
2The tool strips formatting and extracts the 6-character issuer base, the 2-character issue number, and the final check digit.
3It runs the mod-10 algorithm on the first 8 characters to calculate the expected check digit.
4The calculated check digit is compared against the provided 9th character to confirm validity and display the breakdown.

Use cases

Validating CUSIP lists extracted from legacy databases before migration.
Verifying bond identifiers in corporate treasury reports.
Double-checking stock symbols and CUSIPs during trade reconciliation.

Examples

1. Verifying Apple Inc. Common Stock CUSIP

Financial Data Analyst

Background

An analyst is preparing a portfolio report and needs to verify the CUSIP for Apple Inc. common stock before submitting it to the compliance team.

Problem

The analyst has the code '037833-10-0' but needs to confirm it is mathematically valid and correctly formatted.

How to use

Paste '037833-10-0' into the CUSIP Code input field and click validate.

Outcome

The tool confirms the CUSIP is valid, showing the issuer base as '037833', the issue number as '10', and the check digit as '0'.

2. Identifying a Typo in a Corporate Bond CUSIP

Portfolio Operations Specialist

Background

A trade settlement failed due to an invalid security identifier. The specialist has the CUSIP '594918105' written down for a Microsoft security.

Problem

Determine if the CUSIP has a typo and check the correct checksum.

How to use

Enter '594918105' into the validator.

Outcome

The validator flags the CUSIP as invalid, indicating that the check digit for issuer '594918' and issue '10' should be '4' instead of '5'.

FAQ

What is a CUSIP number?

A CUSIP is a 9-character alphanumeric code used to identify North American securities, such as stocks and bonds.

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

It applies a mathematical formula to the first 8 characters, converting letters to numbers, to determine if the 9th character matches the expected checksum.

Can I input CUSIPs with spaces or dashes?

Yes, the validator automatically ignores spaces, dashes, and formatting characters during validation.

What information does the breakdown provide?

It separates the CUSIP into the 6-character issuer identifier, the 2-character issue type, and the 1-character check digit.

Does this tool verify if the security is currently active?

No, it validates the mathematical structure and format of the CUSIP, not its active registration status in financial markets.

CUSIP Validator

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

Key facts

Overview

When to use

How it works

Use cases

Examples

1. Verifying Apple Inc. Common Stock CUSIP

2. Identifying a Typo in a Corporate Bond CUSIP

FAQ

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