Tex. Insurance Code § 804.101

(a) In this section:

(1) "Domestic company" means a company that is domiciled in and authorized to engage in the business of insurance in this state.

(2) "Company" means:

(A) an insurance company, including:

(i) a casualty insurance company;

(ii) a county mutual insurance company;

(iii) an exempt association under Section 887.102;

(iv) a farm mutual insurance company;

(v) a fire insurance company;

(vi) a fraternal benefit society;

(vii) a life insurance company;

(viii) a Lloyd's plan;

(ix) a mutual assessment company;

(x) a mutual insurance company other than a mutual life insurance company;

(xi) a reciprocal exchange;

(xii) a risk retention group;

(xiii) a stipulated premium insurance company;

(xiv) a title insurance company; and

(xv) a carrier providing job protection insurance;

(B) a group hospital service corporation;

(C) a health maintenance organization;

(D) a prepaid legal services corporation; or

(E) any other company engaged in the business of insurance as a principal.

(b) A domestic company may be served with process by:

(1) serving the president, an active vice president, secretary, or attorney in fact at the home office or principal place of business of the company; or

(2) leaving a copy of the process at the home office or principal business office of the company during regular business hours.