How to look up a stock certificate number
Updated November 3, 2026
There’s no public database where you can type in a stock certificate number and find out whether it’s worth anything. The number only means something inside the records of the company’s transfer agent. It still matters, though, and so do the other numbers printed on the certificate.
The numbers on a certificate
The certificate number is the serial number this certificate got when it was issued. It’s usually in a top corner, sometimes with letters in front, and it identifies one piece of paper, not the company. The number of shares usually sits in the opposite corner and is written out again in words in the main text.
On most certificates from about 1970 on, you’ll also find a CUSIP number: nine letters and digits that identify the company and the class of shares. Every certificate from the same issue carries the same CUSIP, so it won’t single out yours, but it pins down exactly which company and class you have, even when several companies shared similar names. Our guide on how to read an old stock certificate shows where each number usually sits.
What the transfer agent can tell you
The transfer agent keeps a record of every certificate the company issued. Give them the certificate number and they can usually tell you whether it’s still outstanding or was cancelled when the shares were exchanged, sold or transferred, whether it was reported lost and replaced (in which case the paper no longer counts), who’s registered as the owner, and what the shares represent today after any mergers or splits.
Fair warning: they’ll generally share account details only with the registered owner or that person’s legal representative, such as an executor. The company’s investor relations page names its current transfer agent.
Looking up a CUSIP
The CUSIP database is licensed, so free public lookups are limited, especially for companies that no longer exist. A broker or the transfer agent can look one up for you. Keep in mind that a CUSIP tells you the issue, not whether your particular certificate is still good.
When the company no longer exists
If the company was merged away or dissolved, its old transfer agent may be long gone, and the certificate number won’t lead anywhere on its own. Trace the company first. If another company took it over, that company’s transfer agent will usually have the old records. Our guide on how to find out if an old stock certificate is worth anything covers how.
Keep the details private
Treat the certificate number and the owner’s name like a bank account number. Skip posting a clear photo of both online, and keep the certificate somewhere safe until you know what it’s worth.