| 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 |
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