Assign Unique Stock Grant ID or Stock Certificate Number
Traditionally, stock issuance is represented by a stock certificate, each with an unique number, prefixed by the stock class abbreviation. The number is serial and goes like CS-1, CS-2, CS-3, etc. To track ownership, each new certificate number is unique.
Modern companies and brokerages today follow electronic issuance methods and do not use paper certificates. Even so, a unique stock grant ID is necessary for tracking.
In the cases of changes made to a stock issuance, the old certificate number should be cancelled and a new number issued. If the change is a minor one, such as correcting a clerical error, the same certificate number and ID can be used. However, if the change is a major one, such as change in ownership by transfer or repurchase, an old certificate should be retired and a new one issued.