What it means
A real CUSIP is assigned by CUSIP Global Services and identifies a specific security, such as a share, bond or note. It has nine characters: the first six identify the issuer, the next two identify the particular issue, and the last is a check digit used to catch typing mistakes.
Almost every settlement and reporting system in the market expects one. Some instruments have no CUSIP, however.
Examples include a newly created private placement, an internal loan note, a position in a private fund or a security that has not yet been registered with the agency. Rather than leave the record blank, a firm may create a dummy code so the position can be booked, valued and reconciled.
Dummy codes are also used in testing. Operations teams loading a new trading or accounting system want to run sample trades without touching live securities, so they create fake identifiers that follow the same format.
This lets them check that the system accepts the data and flows it correctly to reports. The key point is that a dummy CUSIP has no standing outside the firm that created it.
It cannot be used to settle a trade with another institution or to file official regulatory reports as if it were genuine. Once the real identifier is issued, the internal record should be updated and the dummy retired.
Good control practice matters here. Dummy codes should follow a clear naming convention, such as a reserved prefix, so no one mistakes them for real securities.
Finance and operations teams should review them regularly because unmatched dummy codes can hide reconciliation breaks. Auditors also take an interest in these codes.
When they test a fund's holdings, a position recorded under a temporary identifier is harder to confirm with an outside custodian, so they may ask for extra evidence such as the legal agreement or a confirmation from the issuer. Keeping that paperwork ready saves time at year end and reduces awkward questions about whether a holding really exists.
In practice
Real-world examples.
Example
A fund administrator receives a $2,000,000 private loan note from a client that has no CUSIP. The administrator creates an internal code starting with a reserved prefix so the holding appears in the portfolio valuation. The code is replaced once the real identifier arrives or the position is sold.
Example
A brokerage is testing a new back-office system before launch. Its team enters 50 sample bond trades using made-up identifiers so no real client positions are affected. The test data is deleted before the system goes live, so the made-up codes never reach a client statement.
Example
A corporate treasury team holds a $500,000 promissory note from a supplier. The note is not a publicly traded security, so the treasury system tracks it with a dummy identifier until the company decides on a formal record. The treasury team lists the note in its monthly report with a clear label showing that it is an internal entry.
Case study
Seen in the real world.
Ridgeway Capital Partners is a fictional investment firm that bought a $4,000,000 slice of a privately placed note. On the settlement date no CUSIP had been issued, so the operations team entered a dummy code, "RCPDUMMY1", to avoid delaying the booking.
Three months later the real CUSIP arrived, but nobody replaced the dummy code in the accounting system. At quarter end, the custodian's report showed the note under the real identifier while the internal ledger showed it under the dummy one, which created a reconciliation difference of $4,000,000 that took a day to explain. The auditors asked for the offering documents to prove the holding was real, which added further delay to the quarter-end close.
This illustrative case led the firm to add a monthly review of all dummy codes and a rule that each one must be replaced within 10 working days of the real identifier being issued.
Watch out
Common mistakes.
- Treating a dummy CUSIP as if it were an official identifier and sending it to a counterparty or regulator, where it will not be recognised.
- Forgetting to replace the dummy code after the real CUSIP is issued, which causes mismatches between internal records and custodian statements.
- Using codes that look exactly like real ones, so staff cannot tell which positions are genuine securities and which are temporary entries.
Questions
People also ask.
What is a CUSIP?
It is a nine-character alphanumeric code that uniquely identifies a security in the United States and Canada, used for trading, clearing and settlement.
Who issues real CUSIP numbers?
They are issued by CUSIP Global Services, which assigns them to issuers on request. Many other markets use a different scheme, such as the ISIN, which can be built around a CUSIP for North American securities.
Is a dummy CUSIP illegal?
No, internal stand-in codes are a normal operational tool, but they must never be presented as real identifiers. Problems arise only when they are passed to outside parties or regulators as though they were genuine.
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