Tex. Business & Commerce Code § 8.206: COMPLETION OR ALTERATION OF SECURITY CERTIFICATE.

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

(1) any person may complete it by filling in the blanks as authorized; and

(2) 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.

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

Amended by Acts 1995, 74th Leg., ch. 962, Sec. 1, eff. Sept. 1, 1995.