| Rank | Company | 2013 Data Center Revenue |
| 1 | Fluor Corporation | $243,370,000 |
| 2 | Jacobs | 47,490,000 |
| 3 | Syska Hennessy Group | 41,934,230 |
| 4 | URS Corp. | 25,100,000 |
| 5 | Vanderweil Engineers | 21,588,000 |
| 6 | Integrated Design Group | 13,574,682 |
| 7 | Parsons Brinckerhoff | 12,185,435 |
| 8 | Environmental Systems Design | 10,063,915 |
| 9 | Arup | 9,997,297 |
| 10 | Highland Associates | 8,400,000 |
| 11 | AKF Group | 7,965,000 |
| 12 | Dewberry | 6,640,874 |
| 13 | Glumac | 6,541,483 |
| 14 | H.F. Lenz | 4,500,000 |
| 15 | Leidos | 4,160,000 |
| 16 | Bala Consulting Engineers | 3,192,000 |
| 17 | Henderson Engineers | 2,782,839 |
| 18 | H&A Architects & Engineers | 2,700,000 |
| 19 | RMF Engineering | 2,500,000 |
| 20 | Zak Companies | 2,414,034 |
| 21 | Wick Fisher White | 1,629,917 |
| 22 | Sparling | 1,626,044 |
| 23 | GHT Limited | 1,575,000 |
| 24 | TLC Engineering for Architecture | 1,531,865 |
| 25 | Newcomb & Boyd | 1,340,931 |
| 26 | Affiliated Engineers | 1,323,000 |
| 27 | RDK Engineers | 1,190,000 |
| 28 | Thornton Tomasetti | 1,138,961 |
| 29 | CRB | 1,013,150 |
| 30 | Dunham Associates | 1,000,000 |
| 31 | Joseph R. Loring & Associates | 1,000,000 |
| 32 | Karpinski Engineering | 951,142 |
| 33 | Bridgers & Paxton Consulting Engineers | 843,476 |
| 34 | KPFF Consulting Engineers | 800,000 |
| 35 | Heapy Engineering | 774,965 |
| 36 | Aon Fire Protection Engineering Corp. | 700,000 |
| 37 | WSP Group | 660,000 |
| 38 | Mazzetti | 494,741 |
| 39 | Martin/Martin | 425,141 |
| 40 | TTG | 351,000 |
| 41 | KJWW Engineering Consultants | 325,576 |
| 42 | Ross & Baruzzini | 318,908 |
| 43 | I. C. Thomasson Associates | 300,000 |
| 44 | Wiss, Janney, Elstner Associates | 270,000 |
| 45 | CJL Engineering | 247,750 |
| 46 | Total Building Commissioning | 246,795 |
| 47 | STV | 217,000 |
| 48 | ThermalTech Engineering | 150,000 |
| 49 | Paulus, Sokolowski and Sartor | 150,000 |
| 50 | Barge Waggoner Sumner & Cannon | 150,000 |
| 51 | Coffman Engineers | 120,000 |
| 52 | GRW | 101,332 |
| 53 | Wallace Engineering | 69,000 |
| 54 | Spectrum Engineers | 65,186 |
| 55 | Allen & Shariff | 65,000 |
| 56 | P2S Engineering | 52,770 |
| 57 | Interface Engineering | 47,004 |
| 58 | Kamm Consulting | 39,350 |
| 59 | SSOE Group | 17,189 |
| 60 | Brinjac Engineering | 10,480 |
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