What banks participate in the medallion signature?

Medallion signature guarantees are primarily offered by certain banks and credit unions that are members of the Medallion Signature Guarantee Program. Common participants include large national banks like Bank of America, Wells Fargo, and JPMorgan Chase, as well as regional banks and local credit unions. These institutions are authorized to provide medallion signatures for various transactions, particularly in the context of securities transfers and estate handling. It's essential to check with specific banks for their participation and any requirements for obtaining a medallion signature.