| O.b. One Communications, Inc. | Lexington | SC | $0 |
| Odd-mac Engineering Limited | Nairobi | | Subcontractor |
| Ofallon Electric Co. | Lebanon | IL | $0 |
| Office/pro Technologies Inc. | Williamsburg | VA | $0 |
| Ohmcomm Inc. | Philadelphia | PA | $0 |
| Oil Capital Electric LLC | Broken Arrow | OK | Subcontractor |
| Oklahoma Electrical Supply Co. | Oklahoma City | OK | Subcontractor |
| Olde Towne Electric, Inc. | Morehead City | NC | $0 |
| Olivers Electric LLC | Chaptico | MD | Subcontractor |
| O'mahony Electrical Services, Inc. | Middleton | MA | $0 |
| O & M Electrical Services, Inc. | Yuma | AZ | $0 |
| One Way Media Solutions Inc. | Benicia | CA | $0 |
| Opix Systems LLC | Lawrenceville | GA | Subcontractor |
| Or Communications Contractor LLC | Espanola | NM | Subcontractor |
| Ordes Electric Inc. | Chalmette | LA | $0 |
| Ostrow Electrical Co. | Worcester | MA | Subcontractor |
| Owen Electric Company, Inc. | Saint Augustine | FL | Subcontractor |
| Pace Event Services, Inc. | Albuquerque | NM | Subcontractor |
| Pac Electric Co. Inc. | Honolulu | HI | Subcontractor |
| Pacific Electro-mechanical Inc. | Pearl City | HI | Subcontractor |
| Parkway Electric & Communications LLC | Holland | MI | $0 |
| Patricia Electric Incorporated | Syracuse | NY | $0 |
| Paynecrest Electric, Inc. | Saint Louis | MO | Subcontractor |
| Pb Crane Inc. | Walnut | CA | Subcontractor |
| PC Enterprises Inc. | Honolulu | HI | Subcontractor |
| PDQ Systems, Inc. | Glendale | AZ | $0 |
| Pearce Services, LLC | Paso Robles | CA | Subcontractor |
| Peco International Electric, Inc. | Doral | FL | Subcontractor |
| Pederson Electric, Inc. | Montrose | CO | $0 |
| Pendleton Electric Co. | Pendleton | OR | $0 |
| Perelco Inc. | Pike Road | AL | $0 |
| Perlectric, Inc. | Fairfax | VA | Subcontractor |
| Perry Electric Incorporated | Walnut Creek | CA | Subcontractor |
| Peterson Electric, Inc. | Spokane | WA | Subcontractor |
| Peyton Communications | White Plains | MD | $0 |
| Pfeffer Electrical Contracting, Inc. | New Baden | IL | $0 |
| Pfeiffer & Son Ltd. | La Porte | TX | $0 |
| Phedcomm, Inc. | Bedford | IN | $0 |
| Photonworks Engineering LLP | Honolulu | HI | Subcontractor |
| Pics Telecom International Corp. | Rochester | NY | $0 |
| P.i.e., Inc. | Whitewood | SD | Subcontractor |
| Pierson Wireless Corp. | Charlotte | NC | $0 |
| Pilgrim Energy, LLC | Huntington Pk | CA | Subcontractor |
| Pinnacle Electric, Inc. | Saint Joseph | MO | $0 |
| Pivium, Inc. | Phoenix | AZ | $0 |
| Pivotel LLC | Norwich | NY | $0 |
| PJS Electric Inc. | New Rochelle | NY | $0 |
| Plexus Installations Inc. | Baltimore | MD | Subcontractor |
| Plug In Electrical Corp. | Luquillo | PR | $0 |
| P M Electrical Contractors Inc. | Miami | FL | Subcontractor |
| Pm Electric, Inc. | Virginia BCH | VA | $0 |
| Polaris Electric Co. Inc. | El Segundo | CA | Subcontractor |
| Polyphase System Inc. | Barrigada | GU | Subcontractor |
| Poplar Hill Companies LLC | Watertown | TN | Subcontractor |
| Portland Electrical Construction, Inc. | Aurora | OR | $0 |
| Post Electric, Inc. | Panama City | FL | Subcontractor |
| Powell Construction Services Inc. | Gulfport | MS | Subcontractor |
| Power Comm Inc. | Hatillo | PR | Subcontractor |
| Power Doctors Electrical Services LLC | Memphis | TN | Subcontractor |
| Powermaster Electric Inc. | Fuquay Varina | NC | $0 |
| Power Plus Inc. | Boise | ID | $0 |
| Power To The People, An Electric Service Company | Fraser | CO | $0 |
| Power Up LLC | Mooresville | IN | $0 |
| Prater Electric Inc. | Broken Bow | OK | Subcontractor |
| Prater Electric LLC | Rowlett | TX | $0 |
| Precise Cabling Inc. | Jacksonville | FL | $0 |
| Precision Contracting Services, Inc. | Jupiter | FL | Subcontractor |
| Precision Electric, Inc.Dexter, NM · UEI P1MZXMKCAAD3 | Dexter | NM | $0 |
| Precision Electric, Inc.Lorton, VA · UEI NCE6BW1LXGG6 | Lorton | VA | Subcontractor |
| Precision Fire Solutions, LLC | West Columbia | SC | Subcontractor |
| Precision Technologies Of Va, Inc. | Spotsylvania | VA | $0 |
| Premier Communication LLC | Smethport | PA | $0 |
| Premier Datacom LLC | Austin | TX | $0 |
| Premier Electronic Solutions For You, LLC | Melbourne | FL | $0 |
| Presidio Systems, Inc. | Livermore | CA | $0 |
| Prime Controls LP | Lewisville | TX | Subcontractor |
| Prime Electrical Contractors Inc. | Cherry Hill | NJ | $0 |
| Prime Electric, Inc. | Albuquerque | NM | $0 |
| Prime Electric LLC | Bellevue | WA | Subcontractor |
| Prime Electric, LLC | Norwich | CT | $0 |
| Prime Time Sports LLC | Arlington Heights | IL | $0 |
| PRL Enterprises LLC | Virginia Beach | VA | Subcontractor |
| Pro 1 Electric, Inc. | Parkersburg | WV | Subcontractor |
| Pro Circuit Inc. | Kansas City | MO | Subcontractor |
| Pro Electrical Contractors Inc. | Delta | CO | $0 |
| Pro-electric, Inc. | Bethlehem | CT | $0 |
| Pro-energy, Corp. | Guaynabo | PR | Subcontractor |
| Professional Audio Designs, Inc. | Wauwatosa | WI | $0 |
| Professional Cabling Solutions LLC | Cincinnati | OH | Subcontractor |
| Professional Electric Technology Energy Services, Inc. | Missoula | MT | $0 |
| Progression Electric, LLC | Knoxville | TN | Subcontractor |
| Progressive Electric, Inc.Charleston, WV · UEI D5BNQYMHEGP5 | Charleston | WV | Subcontractor |
| Progressive Electric, Inc.Mason City, IL · UEI LL45K3V9KN48 | Mason City | IL | $0 |
| Prolectric Electrical Contractors, Inc. | Savannah | GA | Subcontractor |
| Prowire, Inc. | Eagan | MN | $0 |
| Pruitt Communications, Inc. | Headland | AL | Subcontractor |
| PSW Electric 1, Inc. | Bremerton | WA | Subcontractor |
| Pueblo Electric Inc. | Los Alamos | NM | Subcontractor |
| Pueblo Electric's Inc. | Pueblo | CO | Subcontractor |
| Pueo Pacific Services LLC | Honolulu | HI | $0 |
