CUSIP

A CUSIP is a nine-character code that identifies a particular security issue, especially in U.S. and Canadian markets. It helps distinguish one stock class, bond issue, or other instrument from another when matching trades, custody positions, and investment records.

CUSIP stands for Committee on Uniform Security Identification Procedures. The full code identifies the instrument, not the investor who owns it. One issuer can have many CUSIPs because its common shares, preferred shares, and different bonds are not the same security.

Key Takeaways

• The first six characters identify the issuer, the next two identify the issue, and the ninth is a numeric check digit.
• A CUSIP is not a stock ticker, an account number, or a certificate of investment quality.
• A correct check digit can help detect a transcription error; it does not prove that a code was officially assigned.
• Match the code with the security description and relevant date, especially after a corporate action.

Reading a CUSIP

CUSIP Global Services publishes 303075105 as an example for FactSet Research Systems common stock in its identifier structure guide.

The final character is a number from 0 to 9, not a letter. CGS explains this explicitly in CUSIP: A Common Language for Efficient Markets. A letter in the final position signals a format error.

The check digit is an arithmetic consistency check. Even a code that passes that calculation must be matched to an authoritative assignment record. A copied identifier can refer to a different security from the one described in an advertisement or message.

Treat the code as text in a spreadsheet or database. Dropping a leading zero changes the identifier; treating it as a quantity serves no purpose.

Example: Same Issuer, Different Bonds

Suppose a hypothetical company, Harbor Manufacturing, has two outstanding bond issues:

The issuer name alone cannot identify which bond an investor holds. On $10,000 face value, the stated annual coupon amounts would be $400 and $600 respectively, before any default or other adjustment. Using the wrong issue record could therefore produce both the wrong maturity and the wrong expected coupon amount.

These distinct issues need their respective security records and identifiers. No CUSIPs are invented for this illustration. In an actual holding, compare the full code, issuer, coupon, maturity, currency, and any issue-specific features with the confirmation and offering documents.

The same principle applies to equity: a common share and a preferred share from one company are not interchangeable merely because their names share an issuer.

CUSIP Versus Other Identifiers

For CGS-assigned ISINs, a CUSIP or CINS occupies positions 3-11. That does not mean every ISIN worldwide contains a CUSIP; other numbering agencies use other national identifiers. CGS describes the relationship in its ISIN structure examples.

Two investors can hold the same CUSIP in different accounts. One investor can also have several purchase lots under the same CUSIP, each with a different acquisition date or cost. The identifier does not replace those ownership and transaction records.

Where to Find and Verify a CUSIP

Start with the security’s offering document, a trade confirmation, or the broker’s detailed security record. For U.S. municipal bonds, the Municipal Securities Rulemaking Board’s EMMA service provides a public research source; use the full issue description as well as the identifier.

CUSIP Global Services handles assignments and reference data. Its current organization information identifies FactSet as its manager on behalf of the American Bankers Association. Older descriptions naming Standard & Poor’s as the current operator are outdated.

When two records disagree:

1. Confirm that both codes are complete, including leading zeros and the final digit.
2. Compare the security type, share class or bond terms, and issuer’s legal name.
3. Check the effective dates and any merger, conversion, redemption, or other corporate-action notice.
4. Ask the broker, custodian, or reference-data provider to resolve the mismatch before treating the records as equivalent.

Do not overwrite historical codes just to make a spreadsheet match today’s record. A successor security can be economically and legally different from the earlier issue.

Limits of a CUSIP

A CUSIP is an identification tool, not a credit rating or regulatory endorsement. Its presence does not establish that a security is currently tradable, liquid, eligible for a particular account, or suitable for an investor.

A correct identifier also cannot ensure successful trade settlement. The parties still need matching quantities, cash amounts, settlement instructions, and available securities.

This article is educational. The identification examples are not recommendations to purchase the named or hypothetical securities.

Related Terms

• ISIN: The international instrument identifier into which a CUSIP may be incorporated.
• SEDOL: A seven-character identifier used in global securities reference data.
• Share Class: The rights or fee distinctions that can require separate security records.
• Bond: A debt instrument whose specific issue, not just issuer name, must be identified.

FAQs

Check Your Understanding