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) Brightstar Global Solutions Corporation

4) CenterPoint Energy, Inc.

5) Experian

6) HCA Healthcare

7) Luminant Generation Company LLC

8) Texas Association of Obstetricians & Gynecologists

9) Texas Wildlife Association

10) The Real Estate Council of San Antonio, Inc.

11) TXU Energy Retail Company LLC

12) Vistra Corp.

13) Vistra Corporate Services Company