Medallion Signature Guarantee
A guarantee seal applied to securities, in the process of transfer, by member institutions of the Medallion program.
Investopedia Commentary
This Medallion seal certifies that the signature is genuine and has legally binding authority. Furthermore, the guarantor of the seal assumes any financial responsibility associated with the endorsement.
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See also: Bond, Erasure Guarantee, Securities Transfer Association Medallion Program - Stamp, Transfer Agent