| Apex Automation Inc. | La Fontaine | IN | Subcontractor |
| Apollo Group Inc. | Kingston | PA | $0 |
| Aps Corp. | Branchburg | NJ | $0 |
| Arc Electric And Lighting Corporation | Spokane | WA | Subcontractor |
| Arc Electric Construction Co. Inc. | Hazle Township | PA | Subcontractor |
| Ardent Services L.L.C. | Covington | LA | $0 |
| A & R Electric, Inc. | Bridgeport | CT | $0 |
| Ares Spectrum LLC | Herndon | VA | $0 |
| Arizona Communication Experts, Inc. | Tucson | AZ | $0 |
| Ark-la-tex Communications Inc. | Shreveport | LA | $0 |
| Armour & Sons Electric, Inc. | Langhorne | PA | $0 |
| Arnold Electric Company, Inc. | North Little Rock | AR | Subcontractor |
| Arrow Electric Co. Inc. | Louisville | KY | Subcontractor |
| Arrow Lighting & Electrical Limited | Auckland | | $0 |
| Artex Electric Co. | Texarkana | AR | Subcontractor |
| Ashby Communications, Inc. | Roseville | CA | $0 |
| Ashford Electric And Construction Co. | Kirkland | WA | $0 |
| A.s.k. Cable Communications, LLC | Coral Springs | FL | $0 |
| Aspen Custom Electronics Inc. | Stillwater | OK | $0 |
| Aspen Electric LLC | Merrill | OR | $0 |
| Asplundh Electrical Testing, LLC | Foxboro | MA | Subcontractor |
| Asset Protection Partnership, Ltd. | Forest Grove | OR | $0 |
| Atd Audio Visual, LLC | Bronx | NY | $0 |
| Atek Communications Group, Inc. | Clearwater | FL | Subcontractor |
| Atlanta Soundworks, LLC | Fayetteville | GA | Subcontractor |
| Atlantic Electric LLC | North Charleston | SC | Subcontractor |
| Atlas Electric LLC | Wichita | KS | Subcontractor |
| A Treffeisen & Sons LLC | Oneonta | NY | Subcontractor |
| Ats Waypoint, Inc. | Roswell | GA | Subcontractor |
| Audio Associates Of San Diego | Chula Vista | CA | $0 |
| Audio Design Solutions Inc. | Frederick | MD | $0 |
| Audio Marketing Solutions, Inc. | Lincoln | NE | $0 |
| Audio Visual Systems Inc. | Chicago | IL | $0 |
| Austgen Electric Inc. | Griffith | IN | $0 |
| Austin Electrical Construction, Inc. | Buchanan | VA | $0 |
| Austin Electric Company | Chesapeake | VA | Subcontractor |
| Austin Electric Inc. | Joliet | IL | $0 |
| Automated Building Controls Specialist LLC | Redmond | WA | Subcontractor |
| Automated Controls Services, Inc. | La Mesa | CA | Subcontractor |
| Automated Systems Integration, Inc. | Louisville | KY | $0 |
| Automatic Building Controls, LLC | Rolling Meadows | IL | $0 |
| Av Calibrations LLC | San Antonio | TX | $0 |
| Avella Electric LLC | Houston | TX | Subcontractor |
| Avid Fire Protection & Communication LLC | Saint Ann | MO | $0 |
| Avi-spl Deutschland GMBH | Dreieich | | $0 |
| Av Planners | Los Angeles | CA | $0 |
| Avs Installations LLC | Edison | NJ | Subcontractor |
| Baker Electric & Renewables LLC | Escondido | CA | Subcontractor |
| Baldeck Electric | Rochester | NY | $0 |
| Baldwin Line Inc. | Elkridge | MD | $0 |
| Barbosa Enterprises LP | San Antonio | TX | $0 |
| Barnes Electric Company | Grand Junction | CO | $0 |
| Barnett Electric, Inc. | Lawndale | CA | $0 |
| Barts Electric Co. Inc. | Liberty | MO | Subcontractor |
| Basix Automation Integrators Inc. | Dover | NH | $0 |
| Battaglia Electric, Inc. | New Castle | DE | $0 |
| Bay Electric Inc. | Dollar Bay | MI | $0 |
| Bayview Electric L.L.C | Stanwood | WA | Subcontractor |
| B & B Electrical Contractors, LLC | Iron Mountain | MI | Subcontractor |
| B & B Electric Inc. | Springfield | IL | $0 |
| B & B Electric, Inc.Eau Claire, WI · UEI JH2NC33U9AP5 | Eau Claire | WI | Subcontractor |
| B & B Electric, Inc.Fairbanks, AK · UEI UN4YENAB8FK3 | Fairbanks | AK | Subcontractor |
| B-C Company | Fort Worth | TX | $0 |
| Beabout Inc. | Brumley | MO | Subcontractor |
| Beacon Technologies Inc. | Nashville | TN | $0 |
| Bean Electric, LLC | Roseburg | OR | $0 |
| Bearden Electric Inc. | Fort Walton Beach | FL | $0 |
| Becdel Controls, Incorporated | Niles | OH | $0 |
| Beetleco | Fullerton | CA | Subcontractor |
| Beltline Electric Co. LLC. | Paducah | KY | Subcontractor |
| Benecom Computer Company, Inc. | New Orleans | LA | Subcontractor |
| Benmar Electric, LLC | Mcallen | TX | Subcontractor |
| Berger Electric Inc. | Dickinson | ND | $0 |
| Berkshire Systems Group, Inc. | Reading | PA | Subcontractor |
| Bermudez, Longo, Diaz-masso, LLC | San Juan | PR | Subcontractor |
| Besco Electric Corporation | Huntersville | NC | Subcontractor |
| Bettwy Systems Inc. | Duncansville | PA | $0 |
| Big Bear Electric Inc. | Big Bear City | CA | $0 |
| Big G Electric & Engineering LLC | Soldotna | AK | $0 |
| Big Mountain Electric, Inc. | Enumclaw | WA | Subcontractor |
| Big State Electric, Ltd. | San Antonio | TX | Subcontractor |
| Bill Cloutier Electric | Northridge | CA | $0 |
| Bill's Electric Inc. | Webb City | MO | Subcontractor |
| Billy Azbell Electronics Inc. | Belton | TX | Subcontractor |
| Bird Electric Corporation | Poulsbo | WA | Subcontractor |
| Bj-max | Seoul | | $0 |
| Black Bear Electric Inc. | Aurora | CO | Subcontractor |
| Bloc Design-build L.L.C. | Longview | TX | Subcontractor |
| BLP LLC | Albuquerque | NM | Subcontractor |
| Blue Mountain Electric LLC | Pendleton | OR | Subcontractor |
| Blue Sky Technologies, LLC | Brookland | AR | $0 |
| Bluestone Communications Inc. | Folcroft | PA | Subcontractor |
| Blum & Sons Electric, Inc. | Carpinteria | CA | Subcontractor |
| Bobtek Electrical Corp. | Brooklyn | NY | $0 |
| Bockmon & Woody Electric Co. Inc. | Stockton | CA | Subcontractor |
| Bodec Inc. | Price | UT | $0 |
| Boe-tel Tn Company, LLC | Nashville | TN | $0 |
| Bohem Contracting Company, Inc. | Malvern | PA | $0 |
| Boise Networks, Co. | Meridian | ID | $0 |
| Bombard Electric, LLC | Las Vegas | NV | Subcontractor |
