Iowa Code § 554.8206: Completion or alteration of security certificate.

1. If a security certificate contains the signatures necessary to its issue or transfer but is incomplete in any other respect:

a. any person may complete it by filling in the blanks as authorized; and

b. even if the blanks are incorrectly filled in, the security certificate as completed is enforceable by a purchaser who took it for value and without notice of the incorrectness.

2. A complete security certificate that has been improperly altered, even if fraudulently, remains enforceable, but only according to its original terms.