A Medallion Signature Guarantee (MSG) is an assurance that the signer of a financial document has been authenticated by the issuer of the guarantee. It’s like a notarization, but with higher security standards and greater credibility. To be eligible for an MSG, an individual must present valid identification, as well as be listed in one of the guarantor member organizations’ signatory databases. Financial institutions and other approved entities are qualified guarantors and can provide MSGs to individuals who need them to complete certain types of transactions. With an MSG in place, customers can rest assured that their financial documents have been verified and guaranteed by a reliable third-party.