Medallion Stamp Program

A medallion stamp program is a recognized securities-transfer guarantee program through which eligible financial institutions provide medallion signature guarantees. The program is the institutional and risk-control framework; the medallion guarantee is the transaction-level stamp or imprint placed on a particular document.

The programs help transfer agents determine whether a guarantee comes from an eligible participating institution with the required authority and backing. They do not certify the investment, security value, or commercial fairness of a transfer.

Key Takeaways

• The program, participating institution, and individual guarantee are three different layers.
• U.S. investors commonly encounter STAMP, SEMP, and the New York Stock Exchange Medallion Signature Program.
• Only authorized personnel at participating eligible institutions can issue guarantees under their program procedures.
• Transfer agents maintain written standards for accepting guarantees and can reject guarantees that do not satisfy those standards.
• Program participation does not require an institution to serve every requester or guarantee every transaction.

The Three Programs Identified by Investor.gov

The program used matters less to most investors than whether the receiving transfer agent recognizes the guarantee and whether the issuing institution is authorized for the transaction. Program names and administration should be verified through current transfer-agent or guarantor instructions.

How the Program Framework Works

1. An eligible bank, credit union, broker-dealer, trust company, clearing agency, or other institution joins an accepted program.
2. The institution adopts identification, authority, documentation, transaction-value, and stamp-control procedures.
3. Authorized personnel review a customer’s transfer and supporting evidence.
4. If the request satisfies the institution’s requirements, the institution places its coded medallion guarantee on the document.
5. The transfer agent checks the guarantee against its written acceptance standards and reviews the rest of the transfer package.
6. The guarantor and program framework support liability if the guaranteed signature or authority proves defective within the applicable terms.

This structure gives a transfer agent more than a visual identity check. It provides a financially accountable guarantor behind specified securities-transfer warranties.

Program vs. Guarantee vs. Stamp

A valid-looking stamp does not force a transfer agent to process an incomplete, inconsistent, restricted, or unauthorized transfer.

Why Access Can Be Limited

A participating institution may provide medallion services only to established customers because it must assess identity, ownership, authority, transaction value, and fraud risk. Some branches do not have trained personnel or sufficient guarantee authority for larger transfers.

Before visiting a branch, ask:

• Does the institution participate in a program accepted by the transfer agent?
• Is the service limited to account holders or certain account ages?
• Can that location handle the transaction value and legal capacity involved?
• Which original or certified documents are required?
• Must the document remain unsigned until the appointment?
• Are appointments, fees, or review periods involved?

An online directory or branch statement should not replace confirmation from both the institution and the receiving transfer agent.

Worked Example: Guarantee Accepted Under Program Rules

Nora wants to transfer directly registered shares from an individual account into her revocable trust. The transfer agent requires a trust transfer form and medallion guarantee.

Nora’s credit union participates in STAMP but limits the service to members and requires the trust document, account statement, identification, and an unsigned transfer form. An authorized employee verifies the records and applies the institution’s medallion guarantee. The transfer agent then validates the stamp and reviews whether the account names, trust capacity, share amount, and supporting documents match.

STAMP participation supports the guarantee, but it does not itself transfer the shares. Registration changes only after the transfer agent accepts the entire submission.

Common Mistakes

• Calling every bank stamp a medallion: Ordinary branch stamps and notary seals are different.
• Confusing STAMP with the guarantee itself: STAMP is one program; the institution issues the transaction-level guarantee.
• Assuming participation means universal access: Institutions can restrict the service under risk and customer policies.
• Ignoring transaction value: The institution must be willing and authorized to support the guarantee amount.
• Using an unrecognized institution: The receiving transfer agent may reject a guarantee outside accepted standards.
• Changing a stamped document: Alterations can invalidate the guarantee and require a new form.

Public Source Checks

• Investor.gov: Transferring Assets identifies STAMP, SEMP, and the New York Stock Exchange Medallion Signature Program and explains transfer-agent acceptance.
• SEC: Acceptance of Signature Guarantees explains Rule 17Ad-15, eligible guarantor institutions, and written acceptance standards.
• The SEC’s transfer-agent concept release discusses signature guarantee programs within the transfer-agent framework.

Related Terms

• Medallion Signature Guarantee: The transaction-level guarantee issued under a recognized program.
• Signature Guarantee: The broader securities-transfer warranty concept.
• Stock Transfer Agent: Applies written standards when reviewing guaranteed transfer documents.
• Stock Power: A transfer instrument on which a medallion guarantee may be requested.

FAQs

This article is educational only and does not provide legal, tax, estate, compliance, or investment advice. Verify current program participation and document requirements with the guarantor and receiving transfer agent.