| 001 Reactfast Solutions Ltd | United Kingdom |  |
| 1st Insulation Partners Ltd | United Kingdom | |
| 1st Saxon Property Services Ltd | United Kingdom | |
| 21 Energy LLC | United States | |
| 21st Century Infra Tele Limited | India | |
| 3 Ed Glasgow Ltd | United Kingdom | |
| 360 Global Wine Company | United States | |
| 365 Environmental Services Ltd | United Kingdom | |
| 3a's Property Ltd | United Kingdom | |
| A &F Stahl- Und Maschinenbau Gmbh | Germany | |
| A B B Building Technologies Ltd | United Kingdom | |
| A C H Construct SA | Belgium | |
| A C Lloyd (Builders) Ltd | United Kingdom | |
| A C W A Services Ltd | United Kingdom | |
| A C Whyte & Co Ltd | United Kingdom | |
| A D Bly Construction Ltd | United Kingdom | |
| A E Yates Ltd | United Kingdom | |
| A F International Corporation | United States | |
| A G Gaston Construction | United States | |
| A I C Group Inc | United States | |
| A J Morrisroe & Sons Ltd | United Kingdom | |
| A K M Llc | United States | |
| A K P Scotland Ltd | United Kingdom | |
| A L Blades & Sons Inc | United States | |
| A M E C BUILDING LTD | United Kingdom | |
| A M E C CONSTRUCTION SCOTLAND LTD | United Kingdom | |
| A M E C OFFSHORE DEVELOPMENTS LTD | United Kingdom | |
| A T G Airports Ltd | United Kingdom | |
| A Zahner Company | United States | |
| A&B Process System Corporation | United States | |
| A&L, Inc. | United States | |
| A&S Building Systems L.P. | United States | |
| A-One Industries | India | |
| A-Plant | United Kingdom | |
| A. & B. Glass Company Ltd | United Kingdom | |
| A. & H. Construction & Developments Plc | United Kingdom | |
| A. & J. STEPHEN (BUILDERS) LTD | United Kingdom | |
| A. & L. King (Builders) Ltd | United Kingdom | |
| A. E. Stone, Inc | United States | |
| A. Epstein & Sons International Inc. | United States | |
| A. J. Vater & Co., Inc. | United States | |
| A. K. GmbH & Co. Abwicklungs-KG | Germany | |
| A. Muller & Fils Sarl | Luxembourg | |
| A. Ruiz Construction Company & Associates, Inc. | United States | |
| A. Silva & Silva SGPS S.A. | Portugal | |
| A. W. Baulderstone Holdings Pty Ltd | Australia | |
| A. W. Edwards Pty. Ltd. | Australia | |
| A.B.W. BVBA | Belgium | |
| A.E. Smith & Son Proprietary Limited | Australia | |
| A.E.Spink Ltd | United Kingdom | |
| A.F. Connell Ltd | United Kingdom | |
| A.G. Spanos Companies | United States | |
| A.G. Spanos Construction Inc. | United States | |
| A.J. Clark (Holdings) Ltd | United Kingdom | |
| A.J. Johns, Inc. | United States | |
| A.L.H. 86 Ltd | United Kingdom | |
| A.L.L. Masonry Construction Company, Inc. | United States | |
| A.M. Norris Ltd | United Kingdom | |
| A.T. Jones & Son Ltd | United Kingdom | |
| A/R Environetics Group, Inc. | United States | |
| A/S Marius Pedersen | Denmark | |
| A/S Oresundsforbindelsen | Denmark | |
| A/Z Corporation | United States | |
| A1 Housing Bassetlaw Ltd | United Kingdom | |
| Aachener Siedlungs- Und Wohnungsges. Mbh | Germany | |
| Aaf Ltd | United Kingdom | |
| Aanensen's Inc. | United States | |
| Aannemingen Janssen NV | Belgium | |
| Aannemingen Penninck | Belgium | |
| Aannemingen Van Wellen NV | Belgium | |
| Aannemingsbedrijf Aertssen NV | Belgium | |
| Aaron Enterprises, Inc. | United States | |
| Abb As | Norway | |
| ABB Gebaudetechnik AG | Germany | |
| ABB Industry Pty Ltd. | Australia | |
| Abb Power T&D Ltd | United Kingdom | |
| ABB Service Pty Limited | Australia | |
| ABB Setal Lummus | Brazil | |
| Abbey Developments Ltd | United Kingdom | |
| Abbey Pynford Holdings Ltd | United Kingdom | |
| Abbotshall Homes Ltd | United Kingdom | |
| Abbott Group Ltd | United Kingdom | |
| Abco Supply & Service Ltd | Canada | |
| Abel Ajiboye | United States | |
| ABETA International A/S | Denmark | |
| Abigroup Ltd | Australia | |
| Abito Ltd | United Kingdom | |
| ABL Contractors LLC | United States | |
| Able Telcom Holding Corporation | United States | |
| Able UK Ltd | United Kingdom | |
| ABRAHAMS & CARLISLE LTD | United Kingdom | |
| Absher Construction Company | United States | |
| Abu Dhabi Petroleum Co Ltd | United Kingdom | |
| Ac Corporation | United States | |
| Academy Services (Oldham) Holdings Limited | United Kingdom | |
| Academy Services (Oldham) Limited | United Kingdom | |
| Academy Services (Waltham Forest) Ltd. | United Kingdom | |
| Acadian Construction (1991) Ltd | Canada | |
| ACandS, Inc. | United States | |
| ACC Construction Co., Inc. | United States | |
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