Texas Business Organizations Code - BUS ORG § 21.369. Revocability of Proxy

(1) a pledgee;

(2) a person who purchased or agreed to purchase the shares subject to the proxy;

(3) a person who owns or holds an option to purchase the shares subject to the proxy;

(4) a creditor of the corporation who extended the corporation credit under terms requiring the appointment;

(5) an employee of the corporation whose employment contract requires the appointment; or

(6) a party to a voting agreement created under Section 6.252 or a shareholders' agreement created under Section 21.101.

(1) the proxy form conspicuously states that the proxy is irrevocable; and

(2) the proxy is coupled with an interest.