What is a Medallion Signature Guarantee?

Most people first learn about a medallion signature guarantee (MSG) when trying to transfer securities and are told they need a special stamp, available only at specific financial institutions, from specific employees, during specific hours. The requirement can feel outdated and confusing, with many people unsure of its true purpose.

The real purpose of medallion signature guarantees is to protect high-value transfers from fraud. They exist to provide assurance that the signature on a securities transfer is authentic, and the institution issuing the MSG stands behind it financially. If the signature turns out to be fraudulent, the institution may be responsible for the loss. In this way, the MSG acts as fraud insurance attached to a stamp.

For those who manage securities through a broker, MSGs may never be encountered. However, for those dealing with older certificates or paper-based processes, the requirement still appears on forms and in transfer instructions. The MSG shifts some of the risk associated with a signature from the receiving institution to the institution that issues the medallion.

Why does the medallion program still exist?

There are two main reasons:

1. 1.Risk Transfer: The MSG moves risk away from the receiving institution. If a fraudulent transfer occurs, the loss may fall on the institution that issued the MSG, not the company processing the transaction.
2. 2.Legacy Workflows: The medallion program was one of the only widely adopted ways to validate signatures on paper certificates. Over time, these requirements became embedded in standard operating procedures, even as digital channels evolved.

The User Experience Problem

MSGs are inconvenient for most people. Common issues include:

• ​Not every bank offers them
• ​Not every branch of a participating bank provides them
• ​Authorized employees may not always be available
• ​Many institutions only provide them to existing customers
• ​In-person visits are often required, slowing down digital transactions

This leads to workflows that force customers to leave digital environments, find a branch, and hope someone authorized is available. Companies also experience higher abandonment rates, delays, confusion in support channels, and slow paperwork.

Common Challenges Obtaining MSGs

• ​New bank customers may face waiting periods
• ​Customers without existing banking relationships struggle to find participating institutions
• ​Branch employees may lack training, causing delays
• ​Geographic limitations may require significant travel
• ​Time-sensitive transfers can be stalled by branch hours and availability

These barriers create real costs for both customers and organizations.

Digital Medallion Programs: Limitations

Some vendors offer digital medallion guarantee programs, but often focus on recreating the stamp rather than providing strong identity verification and transaction assurance. A digital stamp without robust identity proofing does not provide the security institutions and consumers expect.

The Real Need Behind the Medallion Requirement

Medallion signature guarantees were created to reduce fraud in high-value transfers by giving institutions confidence in the legitimacy of a signature. However, modern fraud threats—such as identity theft, synthetic identities, deepfakes, and credential compromise—are not addressed by paper-era methods.

Organizations are rethinking how they establish trust in transactions. While the medallion program remains a specific legal and risk framework, many adjacent scenarios can benefit from stronger digital identity and execution tools.

Why Digital Identity Assurance is a Better Fit Today

Fraud patterns have shifted to sophisticated digital attacks. Modern identity assurance can detect threats that a physical stamp cannot, using:

• ​Biometric matching to detect deepfakes and spoofing
• ​Document analysis for altered or synthetic credentials
• ​Behavioral analytics for real-time fraud detection
• ​Network intelligence to connect fraud signals
• ​Live agent oversight for high-risk scenarios

With advanced identity verification platforms, organizations can:

• ​Use biometric checks and document analysis to reduce fraud risks
• ​Add human-in-the-loop verification when needed
• ​Execute documents in a controlled, auditable digital environment
• ​Apply tamper-evident seals and cryptographic signatures
• ​Maintain detailed audit trails

Some institutions now accept digital notarization instead of a medallion requirement for certain use cases, based on their own risk assessments and policies.

What Should Businesses Do?

If you use MSGs or are responsible for high-value transfers, consider:

• ​Where MSGs are strictly required by transfer agents, custodians, or regulators
• ​Where medallions are used out of habit rather than explicit requirement
• ​Whether you are using the best tools to validate identity and protect customers
• ​If customers experience unnecessary friction due to legacy channels
• ​Whether digital identity verification and notarization could modernize adjacent workflows

The objective is to align assurance methods with actual risk and use modern tools where appropriate.

Evaluating Your MSG Requirements

• ​Review transfer agent and custodian policies for hard requirements
• ​Examine customer complaint data for workflow friction points
• ​Assess transaction volumes and abandonment rates
• ​Consider pilot programs for digital alternatives in lower-risk scenarios
• ​Evaluate the total cost of medallion-related delays

The goal is not to eliminate MSGs where they serve a clear purpose, but to optimize your approach by using the right tool for each risk profile and regulatory context.

The Bottom Line

Medallion signature guarantees were built for a world of paper certificates and in-person processes. They still serve an important function where required, but are no longer the only way to bring confidence to high-value transactions. Modern identity assurance and digital notarization can complement these legacy tools, helping organizations protect workflows, support digital experiences, and build better evidence about who signed what and when.

In many cases, the best approach is to use medallions and digital identity where each makes the most sense. The real goal is trust that is earned, documented, and defensible.