| Strike Group LLC | Detroit | MI | $0 |
| Strobe Tech, LLC | Clarksville | TN | $0 |
| Sublette Electric Of Wyoming, LLC | Diamondville | WY | $0 |
| Sullivan & Mclaughlin Companies, Inc. | Dorchester | MA | Subcontractor |
| Summit Electric Group Inc. | Ripley | WV | $0 |
| Sunbelt Electrical Company, Inc. | Pasadena | CA | $0 |
| Sun Coast Electric And Networking, Inc. | Tallahassee | FL | $0 |
| Sundancer Electric, Inc. | Renton | WA | $0 |
| Sunderland Electric LLC | New Haven | CT | $0 |
| Superior Electrical Construction, Inc. | Independence | MO | Subcontractor |
| Superior Electric Company, Inc. | Warwick | RI | $0 |
| Superior Electric Service Co. | Wilmington | DE | $0 |
| Sureconnections, Inc. | Sacramento | CA | $0 |
| Swallows Electric Inc. | Houlton | ME | Subcontractor |
| Synchronized Networking Solutions, LLC | Divide | CO | $0 |
| Synergy 768 Inc. | Brentwood | CA | $0 |
| Synet Inc. | Warwick | RI | $0 |
| Syracuse Time And Alarm Co. Inc. | Syracuse | NY | $0 |
| System Innovations Inc. | Downey | CA | Subcontractor |
| Systems Specialists Inc. | Collierville | TN | $0 |
| Tail Industries Inc. | Pittsburgh | PA | $0 |
| Tampa Bay Electric, Inc. | Holiday | FL | Subcontractor |
| T And D Communications, Inc. | Corona | CA | Subcontractor |
| Tandem Instrumentation & Electrical LLC | Port Allen | LA | Subcontractor |
| Tate & Hill, Inc. | Richmond | VA | Subcontractor |
| Taylor Electric Inc. | Huntsville | AL | Subcontractor |
| Tca Electrical Contractors Inc. | Tifton | GA | $0 |
| Tc Impianti SRL | Pordenone | PCN | $0 |
| TDL Electrical Contractors, Inc. | Plymouth | MA | $0 |
| TDN Electric, Inc. | Mountain View | CA | Subcontractor |
| Team One Solutions, Inc. | San Leandro | CA | $0 |
| Technical Business Solutions, Inc. | Newbury Park | CA | $0 |
| Technical Electric Systems Inc. | Debary | FL | Subcontractor |
| Technology Providers Inc. | Phoenix | AZ | Subcontractor |
| Techsys Power International, LLC | Patrick Springs | VA | $0 |
| Teldata Systems Inc. | Kent | WA | Subcontractor |
| Tel Dat Communications Inc. | Hatfield | PA | $0 |
| Telebit S.p.a. | Casier | TUV | $0 |
| Telecom Media Group Corp. | Carolina | PR | $0 |
| Tele Data Com, Inc. | Rochester | NY | $0 |
| Tele-optics Communications, Inc. | Kingsport | TN | $0 |
| Telephone Communications Inc. | Anniston | AL | $0 |
| Tellico Electric, Inc. | Lenoir City | TN | Subcontractor |
| Tel Tech Networks, Inc. | Phoenix | AZ | $0 |
| Tempest Technologies, LLC | Issaquah | WA | $0 |
| Tennessee Associated Electric, LLC | Knoxville | TN | Subcontractor |
| Tennessee Electric Company, Inc. | Kingsport | TN | Subcontractor |
| Tennex Communications, Inc. | Shrewsbury | MA | $0 |
| Teraband Technologies, Inc. | Glendale | CA | $0 |
| Tet Titan Electric Texas LLC | Arlington | TX | Subcontractor |
| Texadia Systems LLC | Addison | TX | $0 |
| TGB Inc. | Saint Louis | MO | $0 |
| The Hild Corporation | Torrance | CA | $0 |
| The Jones Telecom Group Inc. | Chicago | IL | $0 |
| The Laibe Electric Co. | Perrysburg | OH | $0 |
| T & H Electrical, LLC | Wilson | NC | Subcontractor |
| Theoretic Electric Limited Liability Co. | Bothell | WA | Subcontractor |
| The Retrofit Companies, Inc. | Owatonna | MN | $0 |
| The Satellite Guy, Inc. | Waipahu | HI | $0 |
| The Steinhilber Corp. | Escondido | CA | Subcontractor |
| The Wireman Limited Liability Co. | West Caldwell | NJ | Subcontractor |
| Third Coast Tech LLC | Waterford | MI | Subcontractor |
| Thoma Electric, Inc. | San Luis Obispo | CA | Subcontractor |
| Thomas Kovessy Corporation | Huntington Beach | CA | Subcontractor |
| Thompson Solutions Group Co. | Sioux City | IA | Subcontractor |
| Thorco, Inc. | Coeur D Alene | ID | $0 |
| TLC Telecom Inc. | Tucson | AZ | Subcontractor |
| TLL Electric, Inc. | Mesa | AZ | $0 |
| Tltek LLC | Charleston | WV | $0 |
| T.m. Bier & Associates, Inc. | Glen Cove | NY | $0 |
| T&M Electric, Inc. | Santee | CA | Subcontractor |
| Todds Electric Service Inc. | Fort Pierre | SD | $0 |
| Tom Watson, Inc. | El Centro | CA | $0 |
| Torgeson Electric Co. | Topeka | KS | Subcontractor |
| Total Building Solutions Incorporated | Suitland | MD | $0 |
| Total Electrical Services, Inc. | Baton Rouge | LA | $0 |
| Total Electric Service Inc. | Marshfield | WI | $0 |
| Total Electronics Contracting, Inc. | Joplin | MO | $0 |
| Total Fire & Safety, Inc. | Dallas | TX | $0 |
| Touchtel Technology Group & Electrical Services Inc. | Staten Island | NY | $0 |
| Touchtone Communications, Inc. | Olalla | WA | $0 |
| Traffic Control Devices, LLC | Altamonte Springs | FL | $0 |
| Travis Electrical Service LLC | Clarksville | TN | Subcontractor |
| Triad Electrical Solutions, Inc. | Carrollton | VA | Subcontractor |
| Triangle Automated Controls Inc. | Raleigh | NC | Subcontractor |
| Triangle Electrical Systems Inc. | Plattsburgh | NY | $0 |
| Triangle Electric Inc. | Williston | ND | $0 |
| Tricorne Audio, Inc. | Fargo | ND | $0 |
| Trilek Electric, Incorporated | Hacienda Heights | CA | Subcontractor |
| Trinity Contracting Services Co. LLC | Kingston | TN | Subcontractor |
| Trinity Electric, Inc. | North Haven | CT | $0 |
| Trinity Electric LLC | Los Lunas | NM | Subcontractor |
| Triple-r Electric Inc. | Kinston | NC | Subcontractor |
| Tri-star Control Systems, Inc. | Briarcliff Manor | NY | Subcontractor |
| Tri-star Electric, Inc. | Chesapeake | VA | Subcontractor |
| Tri State Electric, Inc. | Boise | ID | Subcontractor |
| Tri State Electric, Limited | Vinton | TX | $0 |
| Tritech Corp. Of America | Waukesha | WI | $0 |
| Tri-tronics Pro Electronics, L.L.C. | Lillington | NC | $0 |
| Triumph Cabling Systems, LLC | Houston | TX | Subcontractor |
