| TOP 70 OFFICE ENGINEERING FIRMS | ||
| Rank | Firm | 2015 Revenue |
| 1 | Jacobs | $438,700,000 |
| 2 | AECOM | $285,000,000 |
| 3 | Thornton Tomasetti | $108,284,346 |
| 4 | WSP | Parsons Brinckerhoff | $93,672,000 |
| 5 | Burns & McDonnell | $59,216,746 |
| 6 | Arup | $55,609,224 |
| 7 | Syska Hennessy Group | $35,568,928 |
| 8 | Dewberry | $29,285,538 |
| 9 | Hankins and Anderson | $25,877,629 |
| 10 | Benham Design | $18,638,864 |
| 11 | Environmental Systems Design | $18,338,134 |
| 12 | Glumac | $16,815,183 |
| 13 | KJWW / TTG | $15,501,754 |
| 14 | Wiss, Janney, Elstner Associates | $15,350,000 |
| 15 | Magnusson Klemencic Associates | $12,831,847 |
| 16 | RDK Engineers | $12,490,393 |
| 17 | Vanderweil Engineers | $11,744,500 |
| 18 | Simpson Gumpertz & Heger | $11,031,000 |
| 19 | Jensen Hughes | $10,470,936 |
| 20 | GHT Limited | $10,470,000 |
| 21 | ME Engineers | $7,790,000 |
| 22 | Henderson Engineers | $7,090,542 |
| 23 | Bridgers & Paxton Consulting Engineers | $6,544,088 |
| 24 | H.F. Lenz Company | $6,466,407 |
| 25 | CJL Engineering, Inc. | $6,266,850 |
| 26 | Bala Consulting Engineers | $5,875,000 |
| 27 | Highland Associates | $5,600,000 |
| 28 | Shive-Hattery | $5,393,049 |
| 29 | Walter P Moore | $5,365,243 |
| 30 | Cardno Haynes Whaley | $5,210,293 |
| 31 | Hixson Architecture, Engineering, Interiors | $5,200,000 |
| 32 | Newcomb & Boyd | $4,875,555 |
| 33 | KCI Technologies | $4,700,000 |
| 34 | Pedco E & A Services | $4,250,000 |
| 35 | Ghafari Associates | $4,000,000 |
| 36 | KZF Design | $3,837,266 |
| 37 | Interface Engineering | $3,625,951 |
| 38 | Heapy Engineering | $3,312,190 |
| 39 | Loring Consulting Engineers | $3,300,000 |
| 40 | Wendel | $3,288,770 |
| 41 | Dunham Associates | $3,250,000 |
| 42 | TLC Engineering for Architecture | $3,193,435 |
| 43 | Luckett & Farley | $3,082,431 |
| 44 | DeSimone Consulting Engineers | $3,052,614 |
| 45 | Spectrum Engineers | $2,951,130 |
| 46 | OLA Consulting Engineers | $2,730,338 |
| 47 | Smith Seckman Reid | $2,629,255 |
| 48 | ThermalTech Engineering | $2,500,000 |
| 49 | Walker Parking Consultants | $2,495,000 |
| 50 | Primera Engineers | $2,390,551 |
| 51 | Affiliated Engineers | $2,360,000 |
| 52 | Coffman Engineers | $2,315,629 |
| 53 | KLH Engineers | $2,313,645 |
| 54 | I. C. Thomasson Associates | $2,177,000 |
| 55 | Baird, Hampton & Brown | $2,141,785 |
| 56 | Wick Fisher White | $2,120,000 |
| 57 | Kamm Consulting | $2,090,195 |
| 58 | Karpinski Engineering | $2,000,000 |
| 59 | Core States Group | $1,964,317 |
| 60 | CTLGroup | $1,900,000 |
| 61 | Mazzetti | $1,624,541 |
| 62 | JQ Engineering | $1,575,300 |
| 63 | SSOE Group | $1,450,000 |
| 64 | Graef | $1,355,627 |
| 65 | Davis, Bowen & Friedel | $1,296,783 |
| 66 | Peter Basso Associates | $1,231,603 |
| 67 | M/E Engineering | $1,172,089 |
| 68 | William Tao & Associates | $1,072,324 |
| 69 | Rist-Frost-Shumway Engineering | $1,000,000 |
| 70 | RMF Engineering | $921,800 |
| 71 | JBA Consulting Engineers | $865,525 |
| 72 | Stanley Consultants | $768,109 |
| 73 | dbHMS | $768,000 |
| 74 | G & W Engineering Corp. | $650,167 |
| 75 | Wallace Engineering | $600,000 |
| 76 | BR+A Consulting Engineers | $600,000 |
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