In the United States, a Medallion Guarantee is a special signature guarantee for the transfer of securities. It is a guarantee by a financial institution that the signature is genuine and the financial institution accepts liability for any forgery. Signature guarantees protect stockholders by preventing unauthorized transfers and possible investor losses. A Notary Public certification is not acceptable for this purpose.
This guarantee is normally obtained from certain banks or other financial institutions. Different institutions have different policies as to what type of identification they require to provide the guarantee and whether they charge a fee for such service. Most institutions would not guarantee a signature of someone who has not already been a customer of the institution.
To obtain the Medallion Guarantee, you should take the form to a bank, savings and loan, credit union, or brokerage that participates in the Medallion Signature Guarantee Program. They will require proof of your identity, and then they will stamp the document with their guarantee.