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) AgriRock, L.L.C.

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) Heartland Quarries LLC

19) HillCo Partners, LLC

20) HTX Utility Solutions LLC

21) Hunter Industries Ltd.

22) Jewett Mine LLC

23) Jimmy Evans Company Inc.

24) Jimmy Evans Company, LTD.

25) JTX Land Holdings LLC

26) Lion Elastomers LLC

27) Northwest Williamson County Municipal Utility District No. 3

28) NRG Texas Power, LLC

29) PHR Holdings LLC

30) Pleak 54 Holdings, LLC

31) Republic EES, LLC

32) Republic Services, Inc.

33) Republic Waste Services of Texas, Ltd.

34) RGI Materials Inc.

35) Second Nature Compost LLC

36) SL Energy Power Plant I, LLC

37) SLR Property I, LP

38) Southwest Shipyards L.P.

39) US Ecology Texas, Inc.

40) US Ecology, Inc.

41) Weisman Equipment Company, Ltd.

42) Williamson County Municipal Utility District No. 42

43) Zinc Resources LLC