Surety Limits for the Medallion Stamp

The Medallion Signature Guarantee stamp has a prefix letter that is embedded within the stamp. The letter prefix denotes the surety limit for that stamp.

This means that if your signature guarantee is prefixed with the letter B, the value of the stock being guaranteed must not exceed $750,000. The chart below details the full range of prefixes.

Medallion Stamps Signature Guarantee’s that are stamped with the Prefix Z can actually provide security up to $14,000,000 but this is for STA Members only.