| Rank | Company | 2013 Engineering Revenue ($) |
| 1 | Fluor Corporation | 585,150,000 |
| 2 | Arup | 136,464,506 |
| 3 | Day & Zimmermann | 130,576,072 |
| 4 | WSP Group | 124,400,000 |
| 5 | Affiliated Engineers | 104,121,000 |
| 6 | KPFF Consulting Engineers | 94,025,000 |
| 7 | Syska Hennessy Group | 93,902,508 |
| 8 | Vanderweil Engineers | 80,334,000 |
| 9 | Simpson Gumpertz & Heger | 71,640,000 |
| 10 | AKF Group | 67,487,000 |
| 11 | Henderson Engineers | 67,409,108 |
| 12 | KJWW Engineering Consultants | 53,874,750 |
| 13 | Smith Seckman Reid | 52,919,312 |
| 14 | M-E Engineers | 48,288,000 |
| 15 | Glumac | 48,000,283 |
| 16 | BR+A Consulting Engineers | 46,000,000 |
| 17 | Magnusson Klemencic Associates | 45,348,511 |
| 18 | Environmental Systems Design | 45,000,000 |
| 19 | TTG | 44,444,960 |
| 20 | Rolf Jensen & Associates | 39,000,000 |
| 21 | Walter P Moore and Associates | 38,940,592 |
| 22 | RDK Engineers | 34,850,000 |
| 23 | TLC Engineering for Architecture | 34,807,545 |
| 24 | DeSimone Consulting Engineers | 34,571,250 |
| 25 | CCRD Partners | 30,200,000 |
| 26 | Coffman Engineers | 28,585,725 |
| 27 | Aon Fire Protection Engineering Corp. | 27,490,000 |
| 28 | Interface Engineering | 25,717,364 |
| 29 | Bala Consulting Engineers | 25,300,000 |
| 30 | I. C. Thomasson Associates | 25,210,000 |
| 31 | Degenkolb Engineers | 23,900,548 |
| 32 | Heapy Engineering | 23,293,500 |
| 33 | Mazzetti | 23,217,528 |
| 34 | Robins & Morton | 21,485,080 |
| 35 | Sparling | 20,957,107 |
| 36 | M/E Engineering | 20,665,840 |
| 37 | KCI Technologies | 18,500,000 |
| 38 | Martin/Martin | 18,488,764 |
| 39 | Joseph R. Loring & Associates | 17,500,000 |
| 40 | Bridgers & Paxton Consulting Engineers | 16,869,537 |
| 41 | KLH Engineers | 16,031,680 |
| 42 | Dunham Associates | 16,000,000 |
| 43 | Wallace Engineering | 14,335,000 |
| 44 | Karpinski Engineering | 14,224,790 |
| 45 | ThermalTech Engineering | 13,600,000 |
| 46 | GHT Limited | 13,260,000 |
| 47 | French & Parrello Associates | 12,518,105 |
| 48 | P2S Engineering | 12,443,860 |
| 49 | Spectrum Engineers | 11,515,076 |
| 50 | CJL Engineering | 10,875,000 |
| 51 | Zak Companies | 9,776,949 |
| 52 | Allen & Shariff | 9,606,286 |
| 53 | Brinjac Engineering | 7,690,671 |
| 54 | Wick Fisher White | 7,442,544 |
| 55 | OLA Consulting Engineers | 6,239,000 |
| 56 | Kamm Consulting | 5,023,662 |
| 57 | G&W Engineering Corp. | 2,757,700 |
| 58 | Total Building Commissioning | 762,246 |
| 59 | Yates Companies, The | 500,000 |
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