A Medallion Signature Guarantee Stamp is a high-security certification used in the transfer or sale of physical securities—stocks, bonds, mutual funds and more. Imprinted in distinctive green ink, it verifies that the endorser’s signature is authentic, the signer has legal authority, and the guarantor institution assumes liability. Only banks, credit unions, broker‑dealers, and other authorized entities permitted by SEC-approved Medallion programs (STAMP, SEMP, MSP) may issue this guarantee.

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