Tex. Business Organizations Code § 21.607

Section 21.606 does not apply to:

(1) a business combination of an issuing public corporation if:

(A) the original articles of incorporation or certificate of formation, as applicable, or the original bylaws of the corporation contain a provision expressly electing not to be governed by this subchapter;

(B) before December 31, 1997, the corporation adopted an amendment to the articles of incorporation or bylaws of the corporation expressly electing not to be governed by this subchapter; or

(C) after December 31, 1997, the corporation adopts an amendment to the articles of incorporation or certificate of formation, as applicable, or the bylaws of the corporation, approved by the affirmative vote of the holders, other than an affiliated shareholder or an affiliate or associate of the affiliated shareholder, of at least two-thirds of the outstanding voting shares of the issuing public corporation, expressly electing not to be governed by this subchapter, except that the amendment to the articles of incorporation or certificate of formation, as applicable, or the bylaws takes effect 18 months after the date of the vote and does not apply to a business combination of the issuing public corporation with an affiliated shareholder whose share acquisition date is on or before the effective date of the amendment;

(2) a business combination of an issuing public corporation with an affiliated shareholder who became an affiliated shareholder inadvertently, if the affiliated shareholder:

(A) as soon as practicable divests itself of a sufficient number of the voting shares of the issuing public corporation so that the affiliated shareholder no longer is the beneficial owner, directly or indirectly, of 20 percent or more of the outstanding voting shares of the issuing public corporation; and

(B) would not at any time within the three-year period preceding the announcement date of the business combination have been an affiliated shareholder except for the inadvertent acquisition;

(3) a business combination with an affiliated shareholder who was the beneficial owner of 20 percent or more of the outstanding voting shares of the issuing public corporation on December 31, 1996, and continuously until the announcement date of the business combination;

(4) a business combination with an affiliated shareholder who became an affiliated shareholder through a transfer of shares of the issuing public corporation by will or intestate succession and continuously was an affiliated shareholder until the announcement date of the business combination; or

(5) a business combination of an issuing public corporation with a domestic wholly owned subsidiary if the domestic subsidiary is not an affiliate or associate of the affiliated shareholder for a reason other than the affiliated shareholder's beneficial ownership of voting shares in the issuing public corporation.