1) Hillco Partners

2) Houston Methodist

3) Legacy Community Health Services, Inc.

4) Purpose Built Communities

1) ACC Houston, LLC

2) AGC of Texas

3) Aquality Solutions, Inc.

4) Arcosa Aggregates Texas, LLC

5) Arcosa LWS, LLC

6) Arcosa Materials, Inc.

7) BFI Waste Services of Texas, LP

8) Colorado Materials, Ltd.

9) Dallas/Fort Worth International Airport

10) Ector County Generation LLC

11) Elgin 104 Holdings LLC

12) FA Victoria 1 LLC

13) First Ammonia LLC

14) Florence 160 Dev LLC

15) Florence FM 970 Ventures, LLC

16) Flying W Properties, Ltd.

17) Fort Bend County Municipal Utility District No. 292

18) Greens Bayou 6 LLC

19) Heartland Quarries LLC

20) HillCo Partners, LLC

21) HTX Utility Solutions LLC

22) Hunter Industries Ltd.

23) Jewett Mine LLC

24) Jimmy Evans Company Inc.

25) Jimmy Evans Company, LTD.

26) JTX Land Holdings LLC

27) Lion Elastomers LLC

28) Macon Enterprises, L.L.C. DBA AgriRock, L.L.C.

29) Northwest Williamson County Municipal Utility District No. 3

30) NRG Cedar Bayou 5 LLC

31) NRG Texas Power, LLC

32) PHR Holdings LLC

33) Pleak 54 Holdings, LLC

34) Power Infrastructure Partners, Inc.

35) Republic EES, LLC

36) Republic Services, Inc.

37) Republic Waste Services of Texas, Ltd.

38) RGI Materials Inc.

39) Second Nature Compost LLC

40) SL Energy Power Plant I, LLC

41) SLR Property I, LP

42) Southwest Shipyards L.P.

43) Tidal PWR, LLC

44) US Ecology Texas, Inc.

45) US Ecology, Inc.

46) Weisman Equipment Company, Ltd.

47) Williamson County Municipal Utility District No. 42

48) Zinc Resources LLC