GIANTS 300 REPORT: Top 75 Office Sector Engineering Firms
| Company | 2014 Office Revenue ($) | |
| 1 | AECOM | $947,497,000 |
| 2 | Jacobs | $512,160,000 |
| 3 | Burns & McDonnell | $69,727,005 |
| 4 | Thornton Tomasetti | $65,486,893 |
| 5 | WSP | Parsons Brinckerhoff | $54,344,358 |
| 6 | Arup | $38,144,105 |
| 7 | Syska Hennessy Group | $37,550,128 |
| 8 | Leidos | $28,461,000 |
| 9 | KPFF Consulting Engineers | $24,527,000 |
| 10 | Hankins & Anderson | $23,890,957 |
| 11 | Dewberry | $19,253,947 |
| 12 | Wiss, Janney, Elstner Associates | $15,750,000 |
| 13 | Environmental Systems Design | $15,276,584 |
| 14 | Magnusson Klemencic Associates | $13,535,865 |
| 15 | RDK Engineers | $13,259,000 |
| 16 | Aon Fire Protection Engineering | $12,000,000 |
| 17 | Vanderweil Engineers | $11,481,900 |
| 18 | Simpson Gumpertz & Heger | $11,470,000 |
| 19 | Cardno Haynes Whaley | $10,529,061 |
| 20 | GHT Ltd. | $10,088,605 |
| 21 | Bala Consulting Engineers | $9,204,000 |
| 22 | ME Engineers | $7,790,000 |
| 23 | KCI Technologies | $7,000,000 |
| 24 | Highland Associates | $6,200,000 |
| 25 | Walter P Moore | $5,498,356 |
| 26 | Hixson Architecture, Engineering, Interiors | $5,000,000 |
| 27 | H.F. Lenz Company | $4,942,560 |
| 28 | Bridgers & Paxton Consulting Engineers | $4,346,316 |
| 29 | CJL Engineering | $4,235,747 |
| 30 | Wendel | $4,099,302 |
| 31 | Henderson Engineers | $4,011,185 |
| 32 | KJWW Engineering Consultants | $3,678,103 |
| 33 | Martin/Martin | $3,334,360 |
| 34 | TLC Engineering for Architecture | $3,225,752 |
| 35 | Guernsey | $3,183,777 |
| 36 | Newcomb & Boyd | $3,159,194 |
| 37 | Jensen Hughes | $3,103,361 |
| 38 | Kamm Consulting | $3,015,715 |
| 39 | KLH Engineers | $3,009,930 |
| 40 | STV | $2,614,000 |
| 41 | Smith Seckman Reid | $2,388,597 |
| 42 | Epstein | $2,340,100 |
| 43 | OLA Consulting Engineers | $2,291,000 |
| 44 | Dunham Associates | $2,250,000 |
| 45 | Karpinski Engineering | $2,200,000 |
| 46 | DeSimone Consulting Engineers | $2,125,440 |
| 47 | SSOE Group | $1,926,260 |
| 48 | Swanson Rink | $1,700,000 |
| 49 | Spectrum Engineers | $1,508,352 |
| 50 | G&W Engineering | $1,453,200 |
| 51 | Peter Basso Associates | $1,404,000 |
| 52 | GRAEF | $1,310,000 |
| 53 | Affiliated Engineers | $1,309,000 |
| 54 | LaBella Associates | $1,284,698 |
| 55 | ThermalTech Engineering | $1,200,000 |
| 56 | GRW | $1,130,150 |
| 57 | Heapy Engineering | $1,104,981 |
| 58 | Barge, Waggoner, Sumner and Cannon | $1,100,000 |
| 59 | Zak Companies | $1,091,570 |
| 60 | M/E Engineering | $1,082,121 |
| 61 | William Tao & Associates | $1,080,000 |
| 62 | Wick Fisher White | $1,013,000 |
| 63 | Rist-Frost-Shumway Engineering | $1,000,000 |
| 64 | Degenkolb Engineers | $880,609 |
| 65 | TTG | $878,125 |
| 66 | Davis, Bowen & Friedel | $702,741 |
| 67 | Mazzetti | $694,206 |
| 68 | Coffman Engineers | $578,000 |
| 69 | Allegheny Design Services | $544,384 |
| 70 | Core States Group | $500,000 |
| 71 | Primera Engineers | $411,476 |
| 72 | CTLGroup | $400,000 |
| 73 | Wallace Engineering | $390,000 |
| 74 | Larson Design Group | $366,645 |
| 75 | I. C. Thomasson Associates | $310,000 |