Tex. Business Organizations Code § 9.251

For purposes of this chapter, activities that do not constitute transaction of business in this state include:

(1) maintaining or defending an action or suit or an administrative or arbitration proceeding, or effecting the settlement of:

(A) such an action, suit, or proceeding; or

(B) a claim or dispute to which the entity is a party;

(2) holding a meeting of the entity's managerial officials, owners, or members or carrying on another activity concerning the entity's internal affairs;

(3) maintaining a bank account;

(4) maintaining an office or agency for:

(A) transferring, exchanging, or registering securities the entity issues; or

(B) appointing or maintaining a trustee or depositary related to the entity's securities;

(5) voting the interest of an entity the foreign entity has acquired;

(6) effecting a sale through an independent contractor;

(7) creating, as borrower or lender, or acquiring indebtedness or a mortgage or other security interest in real or personal property;

(8) securing or collecting a debt due the entity or enforcing a right in property that secures a debt due the entity;

(9) transacting business in interstate commerce;

(10) conducting an isolated transaction that:

(A) is completed within a period of 30 days; and

(B) is not in the course of a number of repeated, similar transactions;

(11) in a case that does not involve an activity that would constitute the transaction of business in this state if the activity were one of a foreign entity acting in its own right:

(A) exercising a power of executor or administrator of the estate of a nonresident decedent under ancillary letters issued by a court of this state; or

(B) exercising a power of a trustee under the will of a nonresident decedent, or under a trust created by one or more nonresidents of this state, or by one or more foreign entities;

(12) regarding a debt secured by a mortgage or lien on real or personal property in this state:

(A) acquiring the debt in a transaction outside this state or in interstate commerce;

(B) collecting or adjusting a principal or interest payment on the debt;

(C) enforcing or adjusting a right or property securing the debt;

(D) taking an action necessary to preserve and protect the interest of the mortgagee in the security; or

(E) engaging in any combination of transactions described by this subdivision;

(13) investing in or acquiring, in a transaction outside of this state, a royalty or other nonoperating mineral interest;

(14) executing a division order, contract of sale, or other instrument incidental to ownership of a nonoperating mineral interest;

(15) owning, without more, real or personal property in this state; or

(16) acting as a governing person of a domestic or foreign entity that is registered to transact business in this state.