1) AMERICAN COLLEGE OF OBSTETRICIANS AND GYNECOLOGISTS

2) BLUECROSS BLUESHIELD OF TEXAS, A DIV. OF HEALTH CARE SERVICE CORP., A MUTUAL LEGAL RESERVE COMPANY

3) CENTERPOINT ENERGY, INC.

4) EXPERIAN

5) HCA HEALTHCARE

6) LUMINANT GENERATION COMPANY LLC

7) PEPSICO, INC

8) RAISE YOUR HAND FOR PUBLIC SCHOOLS DBA RAISE YOUR HAND TEXAS

9) REPUBLIC NATIONAL DISTRIBUTING COMPANY

10) TEXAS ASSOCIATION OF OBSTETRICIANS & GYNECOLOGISTS

11) TEXAS WILDLIFE ASSOCIATION

12) THE REAL ESTATE COUNCIL OF SAN ANTONIO, INC

13) TXU ENERGY RETAIL COMPANY LLC

14) UNION PACIFIC RAILROAD

15) VISTRA CORP

16) VISTRA CORPORATE SERVICES COMPANY