CUSIP Checker User Guide – Easily Validate US Securities Codes

What is a CUSIP Code?

CUSIP (Committee on Uniform Securities Identification Procedures) is the US standard for uniquely identifying stocks, bonds, mutual funds, and other financial instruments in the US and Canada. A CUSIP consists of 9 alphanumeric characters: the first 6 identify the issuer, the 7th and 8th denote the security type, and the 9th is a check digit. For example, Apple’s CUSIP is 037833100.

How to Use This Tool to Validate a CUSIP?

Just three steps to quickly check if your CUSIP code is valid:

1. Paste or type the 9‑character CUSIP code (case‑insensitive) into the input field.
2. Click the “Validate” button.
3. View the result – the tool will tell you whether the format is correct and if the check digit matches.

You can try the example codes to see how it works. If the input is invalid (e.g., wrong length or incorrect check digit), you’ll get a clear error message.

This tool is completely free, no registration required. It’s ideal for investors, financial professionals, and data managers.

Frequently Asked Questions

1. Does a valid CUSIP guarantee that the security actually exists?

This tool validates the format and check digit according to the standard algorithm. A “valid” result means the code is structurally correct. To confirm that the security is actually issued, you would need to consult an official database (e.g., S&P CUSIP Service Bureau). However, most valid CUSIPs do correspond to real securities.

2. Why does my code show as invalid?

Possible reasons: the code is not exactly 9 characters long; it contains disallowed characters (only letters and digits are allowed, case‑insensitive); or the check digit does not match the computed value. Double‑check your input, or test with one of the examples to ensure the tool is working properly.

3. Can this tool validate CUSIP codes in bulk?

This page is designed for single validation. For batch processing, you would need a different solution.

4. What is the difference between CUSIP and ISIN?

CUSIP is used primarily in the US and Canada and has 9 characters. ISIN is an international standard with 12 characters. For US securities, the ISIN is usually formed by prefixing the CUSIP with “US” and adding an extra check digit at the end. For example, Apple’s ISIN is US0378331005, while its CUSIP is 037833100.

5. Do I have to pay for this service?

No, it’s completely free. OkeyTool is committed to providing useful online utilities for everyone.

If you have any other questions or encounter any issues, please feel free to contact us via the footer links. Thanks for using our tool!