Learn About Medallion Signature Guarantee Programs

What Exactly Is a Medallion Signature Guarantee and Why It Matters

A Medallion Signature Guarantee is not your everyday notarization. It's a specialized form of verification that certain financial institutions use to authenticate signatures on specific types of documents—particularly those involving the transfer of securities, investment accounts, or large financial transactions. Think of it as a higher-security cousin to a standard notary public's stamp.

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The difference between a notary public and a Medallion guarantee provider matters significantly. A notary public verifies that someone is who they claim to be and that they're signing a document willingly. Their verification carries limited liability—usually just a few thousand dollars. A Medallion guarantee provider, by contrast, takes on substantial financial liability for their verification, often ranging from $1 million to $25 million depending on the program. This higher stake means the process is more rigorous and the guarantee carries more weight in the financial world.

Three main Medallion programs exist in the United States: the Stock Exchanges Medallion Program (SEMP), the NYSE MKT Medallion Program (also called MSP), and the NASD Medallion Program (now called STAMP). Each operates under slightly different rules and serves different types of financial institutions, though they're all accepted by securities firms and investment companies. Banks, credit unions, and brokerage firms participate in these programs by becoming registered guarantors.

You'll encounter a Medallion guarantee requirement in situations like transferring stocks or bonds to another person, moving securities between brokerage accounts outside normal transfer procedures, granting power of attorney for investment accounts, or settling an estate that involves securities. Some wire transfer requests involving large sums also require this guarantee, particularly when the wire involves investment assets.

Practical Takeaway: Understand that a Medallion guarantee is fundamentally different from notarization due to its higher liability backing and the specialized nature of financial documents it covers. If a bank or brokerage tells you that you need a Medallion guarantee for a financial transaction, they're requiring protection that goes significantly beyond a standard notary's verification.

Understanding the Three Main Medallion Programs and Their Differences

The Stock Exchanges Medallion Program (SEMP) serves as the original and most widely used Medallion program. Created in 1981 through cooperation between stock exchanges and the securities industry, SEMP now operates across all major stock exchanges. The program covers guarantors working for securities brokers, investment advisors, and banks that have clearing operations. When you visit a major brokerage firm's office and need a signature guarantee, you're likely working with a SEMP-certified guarantor.

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The NYSE MKT Medallion Program (MSP), formerly called the American Stock Exchange Medallion Program, focuses primarily on smaller securities firms and regional exchanges. While less commonly encountered than SEMP, MSP remains active and carries the same legal weight. The program was designed to include guarantors at smaller financial institutions that might not have the clearing operations required for SEMP membership. If you're working with a smaller regional brokerage or credit union, you might encounter an MSP guarantor.

The NASD Medallion Program, now officially called the Securities and Exchange Commission Medallion Program (STAMP), handles signature guarantees for securities industry participants that fall outside the SEMP and MSP frameworks. STAMP particularly covers guarantors at banks and certain investment firms. The three programs maintain reciprocal recognition, meaning that a guarantee issued under any of these three programs is accepted by virtually all securities firms and investment companies—there's no hierarchy of acceptance despite differences in how the programs operate.

Each program maintains its own standards for who can become a guarantor and under what conditions. The financial liability backing differs slightly between programs: SEMP guarantors typically carry $1 million liability per guarantee with a $25 million aggregate, while MSP and STAMP programs may have different liability caps. However, from a user perspective, all three programs provide the same level of security and acceptance when you need a signature guarantee for your financial transaction.

The programs also coordinate through the Medallion Signature Guarantee Program Corporation, which oversees compliance and standardization across all three programs. This coordination ensures that standards remain consistent nationwide and that the financial institutions backing these guarantors maintain adequate insurance and reserves to cover potential losses from fraudulent or improperly verified signatures.

Practical Takeaway: Don't worry about which specific Medallion program guarantees your signature—all three programs carry equal weight and acceptance. Focus instead on finding a nearby guarantor, whether through your bank, brokerage, or credit union, since all will have access to one of these three recognized programs.

Where to Find a Medallion Signature Guarantee Provider and What to Expect

Your first stop should be your own financial institution. If you have a brokerage account, your investment firm almost certainly employs or partners with Medallion guarantors. Call your broker's main line and ask to speak with someone in the operations or back-office department about obtaining a signature guarantee. Most large brokerages can provide this service to their clients, often on the same day if you visit in person during business hours.

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Banks and credit unions represent another primary source. If you maintain a checking or savings account at a bank, contact your branch manager or the back-office department. Many banks, particularly larger regional and national institutions, participate in Medallion programs. Credit unions increasingly offer this service as well, especially those affiliated with credit union service organizations (CUSOs) that provide back-office support. Your credit union may not provide it in-house but can likely direct you to a nearby institution that does.

Finding guarantors in your area requires a bit of detective work beyond just walking into your bank. The official Medallion programs maintain directories, though these are somewhat opaque to the general public. Your best approach is to ask any of these three places: (1) contact the firm or person asking for the Medallion guarantee and request a list of nearby providers they work with; (2) call the main branch of major banks or brokerages in your area and ask specifically about signature guarantee services; (3) search for "Medallion signature guarantee near me" along with your city name to find financial service websites that advertise this capability.

When you locate a provider, expect to bring specific items: the document requiring the guarantee, a valid government-issued photo ID, and potentially the original or certified copy of the document in question. The guarantor will verify your identity, ensure you understand what you're signing, and then affix their official Medallion stamp or signature along with their firm's seal. The process typically takes 15 to 30 minutes for a single signature, though complex situations with multiple signatures or documents may take longer.

Cost represents another important consideration. Unlike notary services that charge modest fees (typically $5-$15), Medallion signature guarantees are often provided at no charge to customers of the institution providing the service. However, if you're not a customer, or if you're using a provider who doesn't typically work with you, some charge between $25 and $100 per signature, though this varies widely. Always ask about costs before proceeding.

Practical Takeaway: Start with your current bank or brokerage before searching elsewhere—you likely already have access to a Medallion guarantor without paying additional fees. If you're not a customer anywhere that offers this service, contact the institution requiring the guarantee and ask for referrals to nearby providers.

The Signature Guarantee Process From Start to Finish

The actual process of obtaining a Medallion signature guarantee follows a fairly consistent sequence, though specific details vary slightly depending on whether you're working through a bank, brokerage, or other financial institution. Understanding the steps helps you prepare properly and avoid delays or complications.

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Step one involves identifying exactly what needs to be guaranteed. Not every signature on a financial document requires a Medallion guarantee—only certain transactions warrant this level of verification. Before visiting your guarantor, contact the institution requesting the guarantee (whether it's a brokerage processing a securities transfer, an executor's lawyer handling an estate, or another party) and ask which specific signatures or documents need the guarantee. Some documents require guarantees only on certain signature lines, not across the entire page.

Step two is gathering your documentation. Bring the original document requiring the guarantee, your valid government-issued photo ID (driver's license, passport, or state ID card—the guarantor will verify your identity matches the signature they're witnessing), and any other paperwork the requesting institution specified. Have the document already signed if it should be, or bring it unsigned and have the guarantor witness your signature.