| brink constructors, inc. E0376342005-2 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2005 |
| CRUX SUBSURFACE, INC. E0180882012-9 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2012 |
| CUPERTINO ELECTRIC, INC. C31355-2000 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2000 |
| dashiell, corporation E0081822009-8 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2009 |
| grid training corporation E33763742023-8 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2023 |
| H.L. CHAPMAN PIPELINE CONSTRUCTION, INC. C23355-1999 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 1999 |
| IRBY CONSTRUCTION COMPANY C31028-1998 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 1998 |
| mears group, inc. E0483652006-0 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2006 |
| ngi construction, inc. (modified name) C11029-1994 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 1994 |
| north american industrial services, inc. E0522142007-8 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2007 |
| northstar energy services, inc. E0587002010-4 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2010 |
| probst electric inc. E0071772008-8 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2008 |
| qsi (de), inc. E32704702023-9 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2023 |
| safety test & equipment company, inc. E47907582025-1 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2025 |
| sherman + reilly, inc. E34427832023-7 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2023 |
| THE RYAN COMPANY, INC. OF MASSACHUSETTS E0495492008-6 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2008 |
| winco powerline services, inc. E0091002016-1 | Foreign Corporation | Active In good standing | Director | 2727 North Loop West, Houston TX 77001 | 2016 |
| hargrave power, inc. E0285662015-2 | Foreign Corporation | Dissolved Not in good standing | Director | 2800 POST OAK BLVD STE 2600, HOUSTON TX 77056 | 2015 |
| lex engineering ltd. E0301152019-6 | Foreign Corporation | Withdrawn Not in good standing | Director | 2727 North Loop West, Houston TX 77001 | 2019 |
| m. g. dyess, inc. E0439372009-5 | Foreign Corporation | Converted Out Not in good standing | Director | 2800 Post Oak Blvd, Ste 2600, Houston TX 77001 | 2009 |
| NETWORK ELECTRIC COMPANY C3782-2002 | Foreign Corporation | Merged Not in good standing | Director, Secretary | 1360 POST OAK BLVD STE 2100, HOUSTON TX 77056 | 2002 |
| quanta electric power construction management, inc. E0315612005-2 | Foreign Corporation | Withdrawn Not in good standing | Director | 2800 Post Oak Blvd., Ste. 2600, Houston TX 77001 | 2005 |
| quanta pipeline services, inc. E9621662020-5 | Foreign Corporation | Converted Out Not in good standing | Director | 2800 Post Oak Blvd, Ste 2600, Houston TX 77001 | 2020 |
| quanta services, inc. E0576602018-1 | Foreign Corporation | Withdrawn Not in good standing | Secretary | 2800 Post Oak Blvd, Ste. 2600, Houston TX 77001 | 2018 |
| quanta utility engineering services, inc. E0220232018-7 | Foreign Corporation | Converted Out Not in good standing | Director, Secretary | 2800 POST OAK BOULEVARD, SUITE 2600, Houston TX 77001 | 2018 |
| utility training services corporation E0418962014-8 | Foreign Corporation | Withdrawn Not in good standing | Director | 2800 POST OAK BLVD., STE. 2600, HOUSTON TX 77056 | 2014 |
| w.c. communications, inc. C14733-2003 | Foreign Corporation | Merged Not in good standing | Secretary | 2800 POST OAK BLVD STE 2600, HOUSTON TX 77056 | 2003 |