Know About the Medallion Signature Guarantee and Its Importance

Posted by Peter John
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Apr 22, 2025
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When dealing with certain financial transactions involving US securities, UK residents may come across the term Medallion Signature Guarantee (MSG). Although it is a system based in the United States, understanding its relevance and necessity for UK investors is crucial. A Medallion Signature Guarantee is a special certification used in the United States to verify the authenticity of a signature on securities-related documents. It is commonly required when transferring or selling shares, particularly if the shares are held in physical certificate form or are registered in an individual’s name.

This guarantee acts as a stamp of approval, provided by authorised financial institutions, ensuring that the signature on the financial document is legitimate and that the institution assumes liability for any fraudulent activity. Unlike a notarised signature, an MSG is recognised specifically within the framework of the US financial system.

When is a Medallion Signature Guarantee Required in the UK?

Although MSGs are not used within the UK financial system, they become essential when a UK resident owns US securities or needs to handle a US-based financial transaction. Some common situations where a Medallion Signature Guarantee might be required for UK residents include:

·         Transferring US stocks or bonds to another person.

·         Changing ownership of shares due to inheritance, marriage, or divorce.

·         Selling US securities held in certificate form.

·         Changing account details with a US financial institution.

In these cases, the relevant US institution will often reject documentation that does not include an MSG, regardless of any UK notarisation or legal certification.

Why is a Medallion Signature Guarantee Crucial for UK Investors?

For UK investors with ties to US financial markets, a Medallion Signature Guarantee is vital for completing transactions smoothly. Without it, transactions may be delayed or refused altogether. This can lead to complications, particularly in time-sensitive scenarios such as probate or the urgent sale of securities.

Furthermore, because only authorised institutions can issue a Medallion stamp—most of which are based in the US—it can be challenging for UK residents to obtain one. A limited number of UK-based financial institutions, usually with US affiliations, may be able to help, but these are rare and may have stringent requirements.

While the Medallion Signature Guarantee is a US-based requirement, its impact is felt by UK investors who engage in cross-border investments. Being aware of when and why it’s required—and planning accordingly—can help avoid costly delays and ensure that international financial transactions are processed efficiently. If you're dealing with US securities, it’s wise to consult a financial advisor or an institution familiar with Medallion guarantees to guide you through the process.

Summary: While the Medallion Signature Guarantee is a US-based requirement, its impact is felt by UK investors who engage in cross-border investments. You will get precise solutions and support from a recognised agency in the UK. 

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