- Accenture
- Admiral Security Services
- Advantage Manhole and Concrete Services (AMCS)
- Aerotek
- Agile Sourcing Partners
- ALMS Electric
- Alta Gas
- American Combustion Industries (ACI)
- American Gas Association
- American Security Mortgage
- Anchor Construction Corporation
- AnyTyme Heating
- Aver Technologies
- BF Joy
- C & E Services, Inc.
- Cleaners of America Corp.
- Cognizant
- Contracting & Technical Services, Inc. (CTSI)
- Columbia Gas – Columbia Transmission – NiSource
- CP Vision – Dr. Clifton Peay
- CroppMetcalfe/HomeServe USA
- Data Systems Technology
- Definitive Mechanical
- Denison Landscaping
- Diamond’s Management Group, Inc.
- Dynamic Concepts, Inc. (DCI)
- EN Engineering
- Energytools, LLC
- EverCool Heating & Cooling, Inc.
- Family Chiropractic of Fairfax
- Faneuil
- Ferguson Trenching
- FESCO Energy
- Flagger Force
- Flippo Construction
- Gas Appliance Manufacturers Association (GAMA)
- Health Consultants
- Home is Where the Heart is Crisis Stabilization
- Infrasource
- INSPIRIA Consulting
- Kalmia Construction Company, Inc.
- Leukemia & Lymphoma Society (Greater Capital Area)
- Life Services Inc.
- MasTec
- McBride Real Estate Services
- Michael & Son
- Midas Companies
- Miller Pipeline
- Nagle & Zaller, P.C.
- National Barricade Company (NBC)
- Northern Virginia Building Industry Association (NVBIA)
- Notriga
- NPL Construction Company
- Office Movers
- PN Hoffman
- P&P Excelsior Updates, Inc.
- Precision Pipeline
- R.B. Hinkle Construction Inc.
- Salvation Army (DC Location)
- SAM Companies
- Skoda
- Team America Contractors, Inc.
- Team Fishel
- Teamsters Local Union 96
- Temporary Solutions
- TPL Construction Company
- TV Diversified
- Unifirst
- Utiliquest
- Ventresca Enterprises
- Washington Gas Light Company & It’s Subsidies
- Washington DC Local 5 Plumbers
- Williams Construction and Meter Services Company (Williams Meter Co.)
- Women’s Veterans United Committee
*Subsidiaries include: Frederick Gas Company, Shenandoah Gas Company, Hampshire Gas Company, Arlington & Fairfax Counties, Alexandria & Winchester, Virginia, Prince George’s, Montgomery Counties, and Frederick, Maryland and Hampshire County, West Virginia
