| Rank | Company | 2012 Total Revenue ($) |
| 1 | Fluor | $221,231,200 |
| 2 | Arup | $149,738,587 |
| 3 | Affiliated Engineers | $105,503,000 |
| 4 | WSP USA | $105,362,352 |
| 5 | KPFF Consulting Engineers | $91,000,000 |
| 6 | Syska Hennessy Group | $82,097,502 |
| 7 | Henderson Engineers | $63,485,775 |
| 8 | Smith Seckman Reid | $52,919,312 |
| 9 | KJWW Engineering Consultants | $51,092,154 |
| 10 | Vanderweil Engineers | $50,552,200 |
| 11 | TTG | $49,968,167 |
| 12 | Glumac | $47,967,000 |
| 13 | Bard, Rao + Athanas Consulting Engineers | $41,500,000 |
| 14 | Rolf Jensen & Associates | $40,000,000 |
| 15 | Coffman Engineers | $39,100,000 |
| 16 | Environmental Systems Design | $38,763,000 |
| 17 | Magnusson Klemencic Associates | $37,462,767 |
| 18 | M-E Engineers | $35,400,000 |
| 19 | TLC Engineering for Architecture | $34,295,957 |
| 20 | RMF Engineering Design | $32,300,000 |
| 21 | RDK Engineers | $31,201,000 |
| 22 | Walter P Moore | $29,092,693 |
| 23 | H.F. Lenz | $26,991,500 |
| 24 | Interface Engineering | $25,193,936 |
| 25 | Degenkolb Engineers | $25,127,432 |
| 26 | CCRD Partners | 25,100,000 |
| 27 | Mazzetti | 24,895,804 |
| 28 | Robins & Morton | 24,500,000 |
| 29 | M/E Engineering | 22,687,000 |
| 30 | Aon Fire Protection Engineering | 22,510,728 |
| 31 | Heapy Engineering | 22,116,941 |
| 32 | Sparling | 20,282,073 |
| 33 | Haynes Whaley Associates | 19,907,949 |
| 34 | Newcomb & Boyd | 18,617,195 |
| 35 | KCI Technologies | 18,032,000 |
| 36 | Bridgers & Paxton Consulting Engineers | 16,868,884 |
| 37 | GHT Limited | 16,834,469 |
| 38 | Bala Consulting Engineers | 16,430,000 |
| 39 | French & Parrello Associates | 15,903,300 |
| 40 | ThermalTech Engineering | 15,500,000 |
| 41 | Joseph R. Loring & Associates | 15,000,000 |
| 42 | KLH Engineers | 14,072,830 |
| 43 | Dunham Associates | 14,000,000 |
| 44 | Wallace Engineering | 13,350,000 |
| 45 | P2S Engineering | 12,962,044 |
| 46 | Karpinski Engineering | 12,076,943 |
| 47 | Peter Basso Associates | 11,016,000 |
| 48 | Rist-Frost-Shumway Engineering | 9,300,000 |
| 49 | CTLGroup | 9,000,000 |
| 50 | Allen & Shariff | 8,500,000 |
| 51 | Wick Fisher White | 8,126,951 |
| 52 | Brinjac Engineering | 6,890,645 |
| 53 | OLA Consulting Engineers | 5,500,000 |
| 54 | Eaton Energy Solutions | 4,430,095 |
| 55 | Kamm Consulting | 3,681,775 |
| 56 | FBA Engineering | 3,360,000 |
| 57 | Apogee Consulting Group | 3,331,300 |
| 58 | G&W Engineering | 2,408,800 |
| 59 | Total Building Commissioning | 616,878 |
| 60 | Yates Cos., The | 400,000 |
| 61 | Weis Builders | 300,000 |
Related Stories
| Aug 8, 2013
Energy research animates science sector [2013 Giants 300 Report]
After an era of biology-oriented spending—largely driven by Big Pharma and government concerns about bioterrorism—climate change is reshaping priorities in science and technology construction.
| Aug 8, 2013
Top Science and Technology Sector Engineering Firms [2013 Giants 300 Report]
Affiliated Engineers, Middough, URS top Building Design+Construction's 2013 ranking of the largest science and technology sector engineering and engineering/architecture firms in the U.S.
| Aug 8, 2013
Top Science and Technology Sector Architecture Firms [2013 Giants 300 Report]
HDR, Perkins+Will, HOK top Building Design+Construction's 2013 ranking of the largest science and technology sector architecture and architecture/engineering firms in the U.S.
| Aug 8, 2013
Top Science and Technology Sector Construction Firms [2013 Giants 300 Report]
Skanska, DPR, Suffolk top Building Design+Construction's 2013 ranking of the largest science and technology sector contractors and construction management firms in the U.S.
| Aug 8, 2013
Level of Development: Will a new standard bring clarity to BIM model detail?
The newly released LOD Specification document allows Building Teams to understand exactly what’s in the BIM model they’re being handed.
| Aug 8, 2013
Blueprint for a boom town: Potential pitfalls for booming development
Accolades for Nashville, Tenn., my hometown and GS&P’s flagship location, just keep piling up. In 2011, Forbes named Nashville No. 3 on their list of “The Next Big Boom Towns in the U.S." All of these accolades are wonderful, but Nashville now must work hard to prove their longevity—to grow and build intelligently.
| Aug 8, 2013
Does billing by the hour still make sense?
What’s an idea really worth? That’s the question posed by The New York Times in a provocative article that explores whether the notion of billing time still makes economic sense.
| Aug 8, 2013
Vertegy spins off to form independent green consultancy
St. Louis-based Vertegy has announced the formation of Vertegy, LLC, transitioning into an independent company separate from the Alberici Enterprise. The new company was officially unveiled Aug. 1, 2013
| Aug 6, 2013
CoreNet: Office space per worker shrinks to 150 sf
The average amount of space per office worker globally has dropped to 150 square feet or less, from 225 square feet in 2010, according to a recent global survey conducted by CoreNet Global.
| Aug 6, 2013
Australia’s first net zero office building features distinctive pixelated façade
Australia's first carbon neutral office building, featuring a distinctive pixelated façade, recently opened in Melbourne.
