| Rank | Company | 2012 Retail Revenue ($) |
| 1 | Jacobs Engineering Group | $146,400,000 |
| 2 | AECOM Technology Corp. | $118,220,000 |
| 3 | Henderson Engineers | $44,677,299 |
| 4 | URS Corp. | $41,152,240 |
| 5 | Parsons Brinckerhoff | $19,100,000 |
| 6 | Wiss, Janney, Elstner Associates | $17,310,000 |
| 7 | Bergmann Associates | $13,000,000 |
| 8 | Wallace Engineering | $9,250,000 |
| 9 | Buro Happold Consulting Engineers | $7,176,000 |
| 10 | Arup | $6,574,122 |
| 11 | KLH Engineers | $6,500,000 |
| 12 | Shive-Hattery | $5,460,111 |
| 13 | Aon Fire Protection Engineering | $5,000,000 |
| 14 | Dunham Associates | $4,800,000 |
| 15 | Science Applications International Corp. | $4,540,119 |
| 16 | Magnusson Klemencic Associates | $4,310,779 |
| 17 | Walker Parking Consultants | $3,109,222 |
| 18 | Dewberry | $2,959,286 |
| 19 | Coffman Engineers | $2,630,000 |
| 20 | Rolf Jensen & Associates | $2,400,000 |
| 21 | Simpson Gumpertz & Heger | $2,300,000 |
| 22 | BRPH | $2,190,000 |
| 23 | AKF Group | $2,126,000 |
| 24 | Bala Consulting Engineers | $2,050,000 |
| 25 | Hixson Architecture, Engineering, Interiors | $2,000,000 |
| 25 | KPFF Consulting Engineers | $2,000,000 |
| 27 | RDK Engineers | $1,988,000 |
| 28 | KJWW Engineering Consultants | $1,839,865 |
| 29 | Davis, Bowen & Friedel | $1,833,817 |
| 30 | CTLGroup | $1,800,000 |
| 30 | French & Parrello Associates | $1,800,000 |
| 32 | Interface Engineering | $1,650,727 |
| 33 | WSP USA | $1,178,606 |
| 34 | Clark Nexsen | $1,103,460 |
| 35 | Thornton Tomasetti | $1,087,551 |
| 36 | Middough | $1,000,000 |
| 37 | Stanley Consultants | $964,786 |
| 38 | SSOE Group | $953,760 |
| 39 | TTG | $891,500 |
| 40 | TLC Engineering for Architecture | $835,647 |
| 41 | H.F. Lenz | $821,000 |
| 42 | Wick Fisher White | $747,679 |
| 43 | Eaton Energy Solutions | $738,894 |
| 44 | GRAEF | $687,733 |
| 45 | Glumac | $604,000 |
| 46 | OLA Consulting Engineers | $450,000 |
| 47 | Spectrum Engineers | $443,550 |
| 48 | KCI Technologies | $400,000 |
| 49 | Kamm Consulting | $323,365 |
| 50 | Sparling | $301,653 |
| 51 | M-E Engineers | $300,000 |
| 52 | Walter P Moore | $296,903 |
| 53 | Allen & Shariff | $250,000 |
| 54 | Vanderweil Engineers | $241,000 |
| 55 | Karpinski Engineering | $213,285 |
| 56 | Barge, Waggoner, Sumner and Cannon | $200,000 |
| 57 | Haynes Whaley Associates | $182,703 |
| 58 | G&W Engineering | $150,000 |
| 59 | Degenkolb Engineers | $146,590 |
| 60 | GHT Limited | $140,000 |
| 60 | Joseph R. Loring & Associates | $140,000 |
| 62 | H&A Architects & Engineers | $109,974 |
| 63 | Apogee Consulting Group | $72,000 |
| 64 | GRW | $65,210 |
| 65 | Guernsey | $51,330 |
| 66 | Mazzetti | $42,931 |
| 67 | Brinjac Engineering | $33,140 |
| 68 | FBA Engineering | $25,000 |
| 68 | ThermalTech Engineering | $25,000 |
| 70 | Total Building Commissioning | $21,208 |
| 71 | Environmental Systems Design | $17,060 |
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