Sec. 21.210.  RESTRICTION ON TRANSFER OF SHARES AND OTHER SECURITIES.  (a)  A restriction on the transfer or registration of transfer of a security, or on the amount of a corporation's securities that may be owned by a person or group of persons, may be imposed by:
(1)  the corporation's certificate of formation;
(2)  the corporation's bylaws;
(3)  a written agreement among two or more holders of the securities; or
(4)  a written agreement among one or more holders of the securities and the corporation if:
(A)  the corporation files a copy of the agreement at the principal place of business or registered office of the corporation; and
(B)  the copy of the agreement is subject to the same right of examination by a shareholder of the corporation, in person or by agent, attorney, or accountant, as the books and records of the corporation.
(b)  A restriction imposed under Subsection (a) is not valid with respect to a security issued before the restriction has been adopted, unless the holder of the security voted in favor of the restriction or is a party to the agreement imposing the restriction.
Acts 2003, 78th Leg., ch. 182, Sec. 1, eff. Jan. 1, 2006.
Amended by: 
Acts 2005, 79th Leg., Ch. 64 (H.B. 1319), Sec. 48, eff. January 1, 2006.