What is a Medallion Signature Guarantee?
To sell or transfer US or Canadian Securities (stocks, shares and other assets such as investment accounts, involving live, traded shares), you need to sign a stock transfer form (or other transfer instruction form or document), and the signature needs to be “guaranteed” before a transfer agent will accept the transaction.
This affects millions of UK-resident shareholders, and their estate representatives.
The Medallion Guarantee stamp is a type of certification placed onto the transfer instruction document. It acts as official authentication of the validity and authority of the person initiating the transfer.
The stamp shows the transfer agent that the signature is genuine, enabling them to proceed with their instruction to transfer or sell the stock. It is intended to protect shareholders and transfer agents alike from fraud.
With this in mind, the stamp providers must assure themselves that the person initiating a transfer of securities is who they say they are, and that they have documentation confirming their ability and legal authority to authorise a transfer of the securities.
The involvement of multiple stakeholders, including beneficiaries, co-owners of shares, multiple share registrars and transfer agents and differing countries of incorporation, can complicate the process of realising the value of shares. Engaging a professional company like Finders International can offer invaluable assistance, navigating these issues and helping the estate to fulfil its duties. The International Asset Services team is a specialist Finders team focused on shares, foreign bank accounts and investment accounts; contact us to discuss your matter.
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How do Medallion Signature Guarantees Work?
To offer a Medallion signature guarantee, an institution must be a member of one of the three Medallion signature guarantee programs: the Securities Transfer Agents Medallion Program (STAMP), the Stock Exchanges Medallion Program (SEMP), or the New York Stock Exchange Medallion Signature Program (MSP).
Typically, applicants in the USA and Canada can easily get a Medallion signature guarantee at their financial institution where they hold an account. However, applicants outside of North America may struggle to meet this requirement, as many non-US banks and financial institutions do not offer this service.
Obtaining a Medallion Guarantee stamp can be challenging, because the stamp is quite literally a guarantee that the person seeking to change the ownership of securities is who they say they are, and is the proper, entitled person to make that change. So confirming those points is a rigorous process.

Who can issue Medallion Signature Guarantees?
Providers of the Medallion Guarantee Stamp in the UK are all members of the Securities Transfer Agents Medallion Program (STAMP). They comprise a handful of companies in the UK who are authorised to issue the Medallion Guarantee Stamp, but only when they are entirely satisfied that all criteria have been meticulously observed.
As agent for a STAMP member, Finders International provides a no-nonsense service. We will review your documentation before submitting an application, helping prevent delays. The stamped document is returned to you, to allow you to continue working with the North American financial institution requiring the Stamp.
Why do I need a Medallion Signature Guarantee?
For someone who is living outside the US and holding stock in a US or Canadian listed company, the only way to sell the shares or transfer the ownership into a different name is to submit a Medallion Guarantee stamped Transfer Request or Stock Power Form to the transfer agent along with various required documents.
Medallion signature guarantees can be used for many purposes, but the most common reasons are when:
- The name of the securities owner changes
- Securities are gifted
- Securities are moved from one account to another
- The owner of the security passes away
Explore a range of related services that we offer

Finders can sell or transfer foreign listed stocks and shares, obtain a Federal Transfer Certificate from the IRS, attend to the re-issue of uncashed dividend cheques, and bring the value back into the estate.

Finders can have the Medallion Guarantee stamp affixed as part of the wider work of transfer or sale of shares, or on a standalone basis.

Struggling to meet the overseas bank’s requirements to close a deceased person’s account? We can help.

With our network of partners overseas and years of experience, we can help estates clear this obstacle to the recovery of value abroad.

If you are trying to recover overseas assets that have been subject to local escheatment laws, or classified as ‘unclaimed property’, we can help.

Finders can sell or transfer foreign listed stocks and shares, obtain a Federal Transfer Certificate from the IRS, attend to the re-issue of uncashed dividend cheques, and bring the value back into the estate.

Finders can have the Medallion Guarantee stamp affixed as part of the wider work of transfer or sale of shares, or on a standalone basis.

Struggling to meet the overseas bank’s requirements to close a deceased person’s account? We can help.

With our network of partners overseas and years of experience, we can help estates clear this obstacle to the recovery of value abroad.

If you are trying to recover overseas assets that have been subject to local escheatment laws, or classified as ‘unclaimed property’, we can help.
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